Hepph 
S. K. Agarwalla,
IoP, Bhubaneswar
Title:
New
Opportunities at Future
LongBaseline Experiments
Abstract:
In
this talk, I will discuss the
role of nextgeneration
longbaseline (LBL) experiments
in the precision measurement of
neutrino oscillation
parameters and to probe various
beyond the Standard Model (BSM)
scenarios. I will also talk
about the possible
complementarity between upcoming
highprecision LBL experiments
to unravel the Earth's matter
effect and its correlation with
oscillation parameters.
Back 
S. Ansarifard, IPM
Title:
A glimpse on two
Higgs doublet models at forward
experiments
Abstract:
The
(g
−
2)μ
anomaly indicates
that the second generation of
leptons should have new interactions
beyond the standard model. The high
flux of
ν
and
ν
̄
at the forward
μμ experiments
such as FASERν
and SND@LHC makes
them suitable setups to search for
new interactions of the second
generation leptons. In this talk, I
introduce a model in which the
second generation lefthanded
leptons couple to a new righthanded
neutrino,
N, and
a new Higgs doublet which also
couples to the quarks. The
scattering of high energy
νμ
off nuclei can
produce
N. Discovering
even a single such event can be a
harbinger to look for the
spectacular signals of the new Higgs
doublet production at the LHC. I
discuss the possibility of
explaining the
(g
−
2)μ
anomaly by adding
more generations of
N
which will lead to
chain decays of
N
and multiple leptons
with distinct signals both at
forward experiments and at the CMS
and ATLAS detectors. Finally, I show
that by adding a new light singlet
scalar mixed with the neutral
component of the new Higgs doublet
the statistics of the data sample
can be dramatically increased. Back 
K. Azizi, Tehran U.
Title:
Some recent
developments in hadron physics
Abstract:
On
22 March 2021 the LHCb
Collaboration at CERN announced
serious Lepton flavor universality
violation (LFUV) at some hadronic
channels, like B>K l^+l^, up to
3.1 standard deviations from the
standard model (SM) predictions.
However, very recently, the LHCb
reported a relatively small
deviations from the SM theory
expectations in B>K_s l^+l^ &
B>K^* l^+l^ channels. I will
review these results and introduce
some new physics scenarios beyond
the SM to explain the LFUV in the
channels that the violation is
sizable. Then, I will discuss the
recently discovered longlived
doubly charmed tetraquark T_cc and
show our predictions on its mass and
other properties that help us fix
its nature and quantum numbers. Back 
N. Bernal, Antonio
Narino U.
Title:
Dark Matter in the Time of Primordial Black Holes
Abstract:
The
evaporation of primordial black
holes (PBH) with masses ranging from
~10^1 to ~10^9 g could have
generated the whole observed dark
matter (DM) relic density, or at
least have had a strong impact on
the DM genesis. Here we will review
several possibilities beyond the
simplest paradigm, like: i) the
effect of selfinteractions for DM
radiated by PBHs, ii) the interplay
with a second DM production
mechanism, like freezeout or
freezein, iii) and the unavoidable
gravitational production.
Additionally, for very light DM as
in the case of QCD axions of axionlike
particles, we will see that iv) even
if PBHs cannot emit the whole axion
cold dark matter abundance through
Hawking radiation, they can have a
strong impact on the dark matter
produced via the misalignment
mechanism. Back 
D. Cerdeno,
Autonoma U.
Title:
Light
mediators in the neutrino sector: a
new playground for direct detection
experiments
Abstract:
Direct (dark matter) detection
experiments have become extremely
sensitive instruments, to the point
that they will soon be affected by a
new background source: solar
neutrinos. This can be seen as an
opportunity to study new physics in
the neutrino sector, associated with
light mediators. In this talk I will
present two interesting examples. In
the first one, I will argue that
future direct detection experiments
will be able to test the gauged U(1)
LmuLtau solution to the muon
anomalous magnetic moment. In a
second example, I will show that a
recent reevaluation of supernova
constraints (based on the neutrino
diffusion time) allows for a large
increase of the socalled neutrino
floor. Back 
F. Hajkarim, Padua
U.
Title:
Production of Hot Axions in the Early Universe
Abstract:
We study
the thermal production of axions
over different scales especially
around the QCD and electroweak phase
transitions in the early universe.
We focus on the most motivated axion
models i.e. KSVZ and DFSZ including
their UV completion regimes and
investigate how the thermal history
can influence on the production rate
of hot axion as dark radiation
assuming different axion decay
constants. This can lead to
predictions for the future
measurements of the cosmic microwave
background by experiments like
CMBS4. Back 
N. Khan, IPM
Title:
FIMP Dark Matter, Neutrino mass and
mixing angles in the Extended Higgs
Triplet Model
Abstract:
We perform an exclusive study on the
Feebly Interacting Massive Particle
(FIMP) dark matter candidate in an
extended hyperchargeless ($Y=0$)
Higgs triplet model. The additional
neutral $Z_2$odd singlet fermion
plays the role of dark matter with
support from two other vectorlike
fermion doublets. The mixing between
the neutral component of a doublet
and singlet fermions controls the
current relic density through the
Freezein mechanism, whereas the
additional doublet fermion helps to
get the neutrino mass and mixing
angles. We obtain a broad region of
the parameter spaces satisfying the
current relic density and neutrino
mass and mixing angles.
Back 
J. Kopp, Mainz U.
Title:
The Neutrino Magnetic
Moment Portal?
Abstract:
We discuss
neutrino magnetic moments as a way
of constraining physics beyond the
Standard Model. In fact, new physics
at the TeV scale can easily generate
observable neutrino magnetic moments
 we discuss in particular possible
connections to models aiming to
solve the flavor anomalies. We then
highlight the multitude of ways of
probing neutrino magnetic moments,
in particular using direct dark
matter detection experiments (which
are sensitive to neutrino magnetic
moments because of the predicted
modifications to the solar neutrino
scattering rate), stellar cooling,
and cosmological constraints from
BBN and from the CMB. Looking into
the future, we also mention possible
constraints from a future Galactic
supernova explosion, and from
observations of highenergy
astrophysical neutrinos.
Back 
N. Mahmoudi, Lyon U.
Title:
Implications of B anomalies for new
physics
Back 
S. PalomaresRuiz,
IFIC, Valencia
Title:
Dark matter
evaporation from celestial bodies
Abstract:
Scatterings of galactic dark matter
(DM) particles with the constituents
of celestial bodies could result in
their accumulation within these
objects and could give rise to
observable effects. Nevertheless,
the finite temperature of the
medium sets a minimum mass, the
evaporation mass, that DM particles
must have in order to
remain trapped. DM particles below
this mass are very likely to scatter
to speeds higher than the
escape velocity, so they would be
kicked out of the capturing object
and escape. In this talk, I will
describe the calculation of the DM
evaporation mass for all spherical
celestial bodies in hydrostatic
equilibrium and I will illustrate
the critical importance of the
exponential tail of the evaporation
rate. This has not always been
appreciated in some recent works,
which have suggested searches of DM
particles too light to remain
captured and to have observable
effects. Back 
S. Shakeri, Isfahan
U. of Tech.
Title:
The Role of Sterile Neutrinos in
Recent Observed Anomalies
Abstract:
In this talk, I will present an
effective model for the sterile
neutrinos where three sterile
neutrinos couple to SM fermions and
gauge bosons via the SM gauge
symmetric fourfermion interactions.
I will show that the sterile
neutrinos with masses around 90 keV
and specific effective coupling can
explain the XENON1T anomaly
preserving DM astrophysical and
cosmological constraints. I point
out that the presence of three
righthanded sterile neutrino allows
to obtain correct dark matter relic
density by the late entropy
production due to late decay of
heavier righthanded neutrinos.
Besides, I will discuss the
possibility of explaining different
anomalies in other experiments such
as muon g2 and MiniBooNe
experiment. Our model also offers
some new distinctive features which
may potentially produce observable
signals in the sensitivity range of
the next generation of XENON
detectors such as XENONnT, LZ and
DARWIN. Back 
Z. Tabrizi,
Northwestern University
Title: EFT
at FASERv: An experiment to probe
them all
Abstract:
We will discuss how
to systematically study physics
beyond the standard model (BSM) in
the neutrino experiments within the
Standard Model Effective Field
Theory (SMEFT) framework. In this
way, the analysis of the data can
capture large classes of models,
where the new degrees of freedom
have masses well above the relevant
energy of the experiment. Moreover,
it allows us to compare several
experiments in a unified framework
and in a systematic way. Our
proposed approach could be applied
to several short and long baseline
neutrino experiments. We will show
the results of this approach at the
FASERv experiment, which will be
soon installed 480 m downstream of
the ATLAS interaction point. For
some coupling structures, we find
that these neutrino detectors will
be able to constrain interactions
that are almost three orders of
magnitude weaker than the Standard
Model weak interactions, implying
that they will be indirectly probing
new physics at the 10 TeV scale. Back 
S. Trojanowski,Copernicus Ctr.
Title: Beyond the Standard Model physics case of farforward searches at the LHC
Abstract:
During the upcoming
Run 3, a new experimental program
will be initiated at the LHC in its
farforward region. It will focus on
the search for new light particles
and on studying interactions of
highenergy neutrinos. This is
foreseen to be extended towards
further future in the proposed
Forward Physics Facility. In my
talk, I will review the beyond the
Standard Model physics case of this
program. This includes, e.g.,
searches for subGeV unstable
species, the possibility of directly
detecting dark matter scatterings at
the LHC, as well as probing
nonstandard neutrino interactions. Back 
Hepth 
H. Adami, BIMSA,
Beijing
Title: Null boundary
phase space in diverse
dimensions
Abstract:
We construct the boundary
phase space in Ddimensional
Einstein gravity with a
generic given codimension
one null surface as the
boundary. The associated
boundary symmetry algebra is
a semidirect sum of
diffeomorphisms of null
surface and Weyl rescalings.
It is generated by D towers
of surface charges that are
generic functions over the
null surface. These surface
charges can be rendered
integrable for appropriate
slicings of the phase space,
provided there is no
graviton flux through the
null surface. In one
particular slicing of this
type, the charge algebra is
the direct sum of the
Heisenberg algebra and
diffeomorphisms of the
transverse space, for any
fixed value of the advanced
time.
Back 
G. Barnich, ULB
Title: Massless scalar partition
functions on flat backgrounds,
Eisenstein series and modular
invariance in higher dimensions.
Abstract:
The problem of black hole
entropy leads one to study of gauge
systems in the presence of
boundaries, and then also massless
scalars with periodic boundary
conditions. We show that the
partition function of a massless
scalar on the Euclidean spacetime
manifold $\mathbb R^{dq}times \mathbb
T^{q+1}$ is expressed in terms of an
SL$(q+1)$ Eisenstein series.
Implications for modular invariance
in higher dmensions are discussed.
Trace and harmonic anomalies in the
case of $\mathbb T^{d+1}$ are worked
out and shown to originate from a
zero mode. Back 
F. Benini, SISSA
Title:
Factorization and global symmetries
in holography
Abstract:
There exist lowdimensional models
of holography in which the bulk
gravitational theory is dual to an
ensemble average of boundary quantum
field theories (as opposed to a
single theory). In the case of
threedimensional gravitational
theories based on topological field
theories, we draw a connection
between the ensemble averaging (and
the lack of factorization of the
partition function) and the presence
of global symmetries. Once the
global symmetries are removed (by a
suitable gauging procedure), the
gravitational theory behaves as a
unitary quantum system. Back 
S. Deger, Bogazici, Istanbul
Title: Third Way Consistent
Gauge Theories
Abstract: In this talk I will
give an overview of the "third way
consistent" gauge theories. The
field equations of such models do
not come from variation of a local
action without additional fields,
yet their equations of motion are
still onshell consistent. The first
such example was found in
3dimensions which is a massive
YangMills theory. After briefly
introducing
this model, I will describe its N=1
supersymmetric extension. Then, I
will explain the construction of
interacting (d2)form theories in
ddimensions with this property and
discuss some generalizations and
open problems. Back 
L. Donnay, TUW,
Vienna
Title: Fluxes and currents
in celestial holography
Abstract: After a brief review of the main
features of celestial
holography, I will present the
construction of BMS momentum
fluxes for asymptotically flat
spacetimes as well their
relationships with conformally
soft primaries in celestial CFT.
Back

D.
Grumiller, TUW, Vienna
Title:
Generalized dilaton gravity in 2d
Abstract:
Generalized dilaton gravity in 2d is
the most general consistent
deformation of the JackiwTeitelboim
model that maintains local Lorentz
invariance. The action is
generically not powercounting
renormalizable, thus going beyond
the class of models typically
studied. As example, I focus on a
specific family of models that
describe black holes asymptoting to
AdS in the UV and to dS in the IR. Back 
A. Mollabashi,
Yukawa Inst.
Title:
Entanglement Dynamics in Lifshitz
Theories: Slow Modes Take the Main
Role
Abstract:
Much of the
informationtheoretic features
of twodimensional relativistic
scaleinvariant theories are
fixed via conformal symmetry. In
this talk, I will focus on out
of equilibrium properties and
discuss how far we can go for
NONrelativistic scaleinvariant
theories? It turns out that in
such (integrable) theories, most
of the entanglement is carried
by slow modes. I will address
some implications of this notion
on local equilibration and
scrambling of quantum
information in these theories.
Back 
A. Seraj, ULB
Title:
Gravitational wave memory
effects and gyroscopes
Abstract:
In this talk, I will
describe the permanent effect of
gravitational waves on
gyroscopes, i.e. a net change in
the orientation of the gyro
after the passage of the wave. I
will then relate this effect to
generalized BMS charges and
their fluxes.
Back

M. Serone, SISSA
Title:
Resurgence
and 1/N Expansion
in Integrable Field Theories
Abstract:
The
interplay between resurgence
and the 1/N expansion in
various integrable field
theories with renormalons is
studied. We focus on the
free energy in the presence
of a chemical potential
coupled to a conserved
charge, which can be
computed exactly with the
thermodynamic Bethe ansatz (TBA). In
the nonlinear sigma model,
the terms in the 1/N
expansion can be decoded in
terms of a resurgent
transseries in the coupling
constant. In the principal
chiral field we find a new
solution for the large N
free energy which can be
reconstructed using
resurgence. In the GrossNeveu
model, in contrast, nonperturbative
corrections can not be
predicted by a resurgent
analysis. We also study the
properties of the series in
1/N. In the GrossNeveu
model, where this is
convergent, we analytically
continue the series beyond
its radius of convergence
and show how the
continuation matches with
known dualities with
sineGordon theories.
Back 
M. Taghiloo, IASBS,
Zanjan
Title: Symmetries at Null
Boundaries: 3dimensional gravity
Abstract:
Gauge transformations are usually viewed as redundancies in the description of gauge theories and the physical observables must be gauge invariant. This should be revisited in presence of boundaries where a part of gauge transformations to which there are non vanishing surface charge associated, can become physical "nonproper" gauge transformations. One can use these surface charges to label different points of the solution phase space. Here we consider Einstein gravity in presence of a given null boundary. We construct the maximal solutionphase space, find its symmetries and calculate the associated surface charges. Surface charges and their algebra depend on the slicing in solution phase space. We discuss the implications of change of slicing different aspects of solutionphase space, from integrability to algebra of surface charges.
Back 
A.H. Tajdini, UCSB
Title: Charge fluctuation
entropy of Hawking radiation
Abstract:
I will talk about the
fluctuation entropy for
twodimensional matter systems
with an internal symmetry
coupled to Jackiw–Teitelboim(JT)
gravity joined to a Minkowski
region. The fluctuation entropy
is the Shannon entropy
associated to probabilities of
finding particular charge for a
region. I will first consider a
case where the matter has a
global symmetry. The calculation
of the fluctuation entropy of
Hawking radiation shows an
unbounded growth and exceeds the
entanglement entropy in presence
of islands. This indicates that
the global symmetry is violated.
I will then discuss the
fluctuation entropy for matter
coupled to a twodimensional
gauge field. I will further
discuss a lower bound on the
gauge coupling in order to avoid
a similar issue. Also, I will
point out a few puzzles related
to the island prescription in
presence of a gauge symmetry.
Back 
B. Tekin, METU,
Ankara
Title: How does 2+1 dimensional
massive gravity avoid anomalous
dispersion?
Abstract:
In a vacuum with an odd dimensional
spacelike dimensions, a wave pulse
does not suffer dispersion if all
frequencies propagate at the same
speed; and hence the Huygens'
principle is not violated. But for a
spacetime with an even number of
spacelike dimensions, the vacuum is
dispersive even if the wave speed is
independent of the frequency. This
is called anomalous dispersion and
it is a major hindrance to sharp
communication. The rumbling of
thunder is an example to this. 2+1
dimensional gravity has been studied
a lot in the literature but in
general there is dispersion in this
theory in a vacuum. Here we show how
a particular theory in de Sitter
spacetime is dispersionfree. We
also show that 2+1 dimensional de
Sitter spacetime
can be relevant to hyperbolic
metamaterials: they might provide an
example of dS/CFT correspondence. Back 
M. Vahidinia, IASBS,
Zanjan
Title:
Revisiting Black Hole Temperature in Horndeski Gravity
Abstract:
In contrast to the usual
theories of gravity, there are
certain Horendeski's gravities that
Wald's entropy is not consistent
with the first law of black hole
thermodynamics. For these theories,
the speed of propagation of
gravitons and photons are different.
It means that gravitons propagate on
an effective metric. We show that
this effective metric modifies our
notion about the surface gravity and
hence black hole temperature. Using
this modified temperature and the
solution phase space method, we
calculate an unambiguous expression
for entropy that is consistent with
the first law. Back 
Cosmology 
A. Abolhasani, Sharif.
U. of T.
Title:
A systematic approach to the
cosmological correlators in the
presence of the derivative
interactions
Abstract:
In this talk, I
will start with a brief
introduction to the socalled
"inin" formalism. We show that
how we use the action principle
to calculate npoint functions
of cosmological observables.
Afterward, I will move on to
less trivial models that have
derivative interactions. I show
you a systematic prescription
for calculating cosmological
correlation for models with
derivative coupling through
pathintegral formalism and
compare it with the "inin"
formalism results. To this end,
first, I say some words on how
we perform conjugate momentum
path integral  that is a
nontrivial task for the
theories with derivative
couplings. We show that the
effective interaction Lagrangian
suitable for the pathintegral
calculation agrees with the
original interaction Lagrangian;
still, some divergent terms show
up that do not contribute to the
connected diagrams. Besides, I
will introduce the "offshell"
inin formalism that is more
straightforward for the models
with derivative coupling.
Back 
M. Amin, Rice U.
Title: A Spin on Wave Dark
Matter
Abstract:
Can the intrinsic spin of light
dark matter manifest itself on
macroscopic/astrophysical
scales? I will first show that
the nonrelativistic limit,
bosonic spins dark fields are
described by a 2s+1 component
SchrodingerPoisson (SP) system.
This can be very useful in
numerically simulating structure
formation in higherspin dark
matter. I will then show that in
this multicomponent SP
system, there exist solitons
with macrosopic spin. Such
solitons can reveal their
intrinsic spin via gravitational
and nongravitational
interactions. Timepermitting, I
will also discuss solitons
resulting from selfinteractions
in the dark fields, as well as
their formation mechanisms.
Back 
M. Asgari, U. of
Edinburgh
Title:
Cosmology with the
Kilo Degree Survey
Abstract:
The Kilo Degree
Survey (KiDS) is a purposebuilt
gravitational lensing survey with
high quality images and a wide
photometric coverage, resulting in
very high fidelity data. In this
talk I will show the latest results
from the cosmic shear analysis of
1000 square degrees of data from
KiDS and its combination with
spectroscopic galaxy surveys.
Adopting a flat LambdaCDM model we
obtain results that are in 3 sigma
tension with the Planck legacy
survey estimates of
S_8 = sigma_8 (Ω_m/0.3)^0.5. I will
show that our analysis is robust to
a number of measurement and
modelling systematics. Finally I
will focus on constraints on a
selection of alternative models and
discuss the implications of the
observed tension.
Back 
S. Baghram, Sharif. U. of T. Title:
Investigating the cosmic web with
onepoint and crossing statistics Abstact:
The large scale
structure (LSS) of the cosmos is a
vast arena to study the cosmological
models. The data from observations
and simulations show that the LSS is
structured like a cosmic web. In
this talk, I will introduce the
concept of 1point statistics and
crossing statistics in the context
of excursion set theory. Then, I
will discuss that how these two
frameworks are used to study the
cosmic web. The idea of merger
history and specific length in the
distribution of dark matter halos
will be discussed as specific probes
for cosmological models.
Back 
C.
Byrnes, Sussex U.
Title:
Primordial
black holes: A potential LIGOVirgo,
pulsar timing array and QCD
connection
Abstract:
Although black holes can be the
remnants of dead stars, it is also
possible that some are primordial.
Such primordial black holes are the
unique dark matter candidate which
is not a new type of particle, and
they could also explain some of the
unexpected properties of the black
hole mergers that LIGO and Virgo
have detected. I will summarise the
evidence and (finetuning)
challenges behind this claim. There
is interesting coincidence of scales
between the LIGOVirgo events, the
Chandrasekhar limit and the horizon
mass during the QCD transition in
the early universe, and the
wavelength of gravitational waves on
which NANOGrav may (potentially)
have detected a stochastic
gravitational wave background. Back 
E. Colgain, Sogang U.
Title:
Is the Hubble constant a constant?
Abstract:
Proposed cosmological
resolutions to Hubble tension, a
discrepancy in the Hubble
constant H0, are essentially all
within the FLRW paradigm.
Nevertheless, a number of recent
results point to problems with
the working FLRW assumption. I
will review these works and make
the case that H0 may be larger
in directions aligned with the
CMB dipole. If true, Hubble
tension becomes a symptom of a
deeper problem.
Back 
E. Dimastrogiovanni,
Groningen U.
Title:
Gravitational waves from
inflation
Abstract:
Primordial gravitational
waves have the potential to
shed new light on the very
early universe. In this talk
I will discuss gravitational
wave production in a variety
of models beyond the
simplest, singlefield,
scenarios and highlight some
of their implications for
testing inflation with
interferometers.
Back

J. T. Firouzjaee,
Kh. Nasir T. U.
Title:
PBHs origins and their merger
rate in different halo models
Abstract:
Primordial black holes (PBHs)
that form from the collapse of
density perturbations in the
early universe received much
attention due to their
gravitational behaviour which is
like dark matter. In this talk,
I review some PBHs formation
scenarios in the inflationary
models that try to explain the
origin of Primordial Black Holes
(PBHs) from the enhancements of
the power spectrum or due to the
bubbles of true vacuum that
nucleate during the course of
inflation. In the following,
assuming that PBHs be a fraction
of dark matter and their merging
happens in the dark matter halo,
It'll be shown that the halo
mass function can affect the
merger rate of PBHs. To show
this, I present the effect of
different halo models on the
dark matter abundance by the PBH
merger which is estimated from
the gravitational waves
detections via the Advanced LIGO
(aLIGO) detectors.
Back

D. Grin, Haverford
College
Title:
Ultralight
axions and CMB anisotropies from
degree to arcminute scales
Abstract:
Ultralight axions
are a wellmotivated candidate for
dark matter and dark energy,
motivated both by considerations
from highenergy theory and
observational challenges to the
Lambda CDM cosmological paradigm. We
will summarize the motivation to
consider such a darksector
component, and explore empirical
consequences, ranging from the
primary anisotropies of the CMB to
latetime secondary anisotropies
imprinted by gravitational lensing
and Compton scattering in galaxy
clusters, to local precision
measurements. We will explore the
potential of upcoming experimental
efforts to critically test the
ultralight darksector parameter
space. Back 
S. von Hausegger, Oxford University
Title:
Testing the Cosmological
Principle with Distant Galaxies
Abstract:
In
the first part of this talk I
will discuss the Cosmological
Principle — the assumption that
our universe is homogeneous and
isotropic on large scales — and
its central role in standard
analyses in cosmology. Various
tests can be devised to examine
the validity of the Cosmological
Principle in probes of Large
Scale Structure. I will then
focus on one such test, that we
conducted on a large, fullsky,
fluxlimited sample of highredshift
galaxies, 1.36 million quasars
observed by the WISE satellite,
which reveals inconsistency with
the Cosmological Principle at
4.9σ — the highest significance
of any such finding todate. I
will discuss consequences of
this result and comment on
possible avenues for future
research.
Back 
N. Khosravi, Sh.
Beheshti U.
Title: Title:
Cosmological Tensions as hints
for New Physics?
Abstract:
We proposed a dark
energy model based on
the GinzburgLandau
theory of critical
phenomena. We study the
original model and its
phenomenological
realizations against
different datasets. It
seems H0 and S8 tensions
can be removed in this
model while we have not
added BAOs. Our original
idea proposes a
framework to study the
spatial tensions in
cosmology which I will
review the main idea
very quickly. On the
other hand, a very
specific prediction of
our model is the
existence of (dynamical)
patches which can be a
smoking gun for the main
idea. We have checked
the effects of these
patches and see the
CMBlensing anomaly as
well as low/highell
inconsistencies can be
removed in our model.
Back 
B. Melcher, Northeastern U
Title:
Alternative Thermal Histories and
Dark Matter
Abstract:
Beyond Standard Model physics
generically predicts the existence
of a variety of dark sectors. The
presence thereof can affect the
thermal history of the universe,
which can leave observable imprints
on various cosmological observables.
We discuss these issues in
generality, then look at an example
of a dark matter production
mechanism that induces an early
matter dominated era.

M. Zarei, Isfahan
U. of T.
Title:
NonMarkovian open quantum system
approach to the early universe
Abstract:
In this talk, we review the
application of the nonMarkovian
quantum Boltzmann equation (QBE) in
CMB and GWs physics. Using this
equation we study the microscopic
influence of a cosmic environment on
a system of cosmic background
photons or stochastic gravitational
waves. We apply the nonMarkovian
QBE to study the damping of
gravitational waves propagating in a
medium consisting of decoupled
ultrarelativistic neutrinos. It is
shown that, in contrast to intensity
and linear polarization that are
damped, the circular polarization
(Vmode) of the gravitational wave
(if present) is amplified by
propagating through such a
medium. We will also discuss the
decoherence induced by squeezed
stochastic GWs and show that one can
derive the decoherence damping time
using nonMarkovian open quantum
system approach. Back 
Special talk by
Azadeh Fattahi,
Durham U.
Title:
Recent
findings of Gaia on Galactic
accretion history and its
implications for dark matter direct
detection
Abstract:
Thanks to the Gaia mission, we
have uncovered a major component of
the Galactic inner halo
characterised by its high
anisotropy, named “GaiaEnceladusSausage”.
This component is thought to be the
debris from the accretion of a
massive dwarf galaxies and a
significant event in the history of
the Milky Way. Using cosmological
hydrodynamical simulations of Milky
Way like halos, I will discuss built
up of stellar halos and what this
particular event implies for the
kinematics of Galactic dark matter
halo and the implications for dark
matter detection experiment. Back 
Planery
Speakers 
K.
Freese, U. of Texas, Austin
Title:
Dark
Matter in the Universe
Abstract:
The nature of the dark matter in the
Universe is among the longest
outstanding problems in all of
modern physics. The bulk of the mass
in the Universe is thought to
consist of a new (as yet unknown)
dark matter particle. I'll begin by
discussing the evidence for the
existence of dark matter in
galaxies, and then show how it fits
into a big picture of the Universe
containing 5% atoms, 25% dark
matter, and 70% dark energy.
Neutrinos constitute ½% of the
content of the Universe and we are
nailing down their properties with
cosmological data. Leading
candidates for the dark matter are
Weakly Interacting Massive Particles
(WIMPs), axions, sterile neutrinos,
primordial black holes, and light
dark matter. WIMPs are a generic
class of particles that are
electrically neutral and do not
participate in strong interactions,
yet have weakscale interactions
with ordinary matter. I’ll discuss
multiple approaches to experimental
searches for WIMPS: at CERN in
Geneva, in underground laboratories,
with astrophysical searches, looking
for tracks in ancient rocks. I’ll
tell you about our novel idea of
Dark Stars, early stars powered by
dark matter heating, and the
possibility that the upcoming James
Webb Space Telescope could find
them. Current results from the DAMA
experiment keep getting more
puzzling and the interpretation in
terms of dark matter will be tested
soon. I’ll end by showing how
stellar kinematics data from the
GAIA satellite provides a new
approach to test the nature of Dark
Matter. Back 
J. GarciaBellido,
IFT, Madrid
Title:
Covariant
formulation of nonequilibrium
thermodynamics in General
Relativity: Cosmic Acceleration from
First Principles
Abstract:
We construct a generallycovariant
formulation of nonequilibrium
thermodynamics in General
Relativity. We find covariant
entropic forces arising from
gradients of the entropy density,
and a corresponding nonconservation
of the energy momentum tensor in
terms of these forces. We also
provide a Hamiltonian formulation of
General Relativity in the context of
nonequilibrium phenomena and write
the Raychaudhuri equations for a
congruence of geodesics. We find
that a fluid satisfying the strong
energy condition could avoid
collapse for a positive and
sufficiently large entropicforce
contribution. We then study the
forces arising from gradients of the
bulk entropy of hydrodynamical
matter, as well as the entropy of
boundary terms in the action, like
those of black hole horizons. We
apply the covariant formulation of
nonequilibrium thermodynamics to
the expanding universe and obtain
the modified Friedmann equations,
with an extra term corresponding to
an entropic force satisfying the
second law of thermodynamics.
General relativistic entropic
acceleration theory may explain the
present cosmic acceleration from
first principles without the need of
introducing a cosmological constant.
Following the covariant formulation
of nonequilibrium phenomena in the
context of a homogeneous and
isotropic
FriedmannLemaitreRobertsonWalker
(FLRW) metric, we find that the
growth of entropy associated with
the causal horizon of our universe
(inside a finite bubble in eternal
inflation) induces an acceleration
that is essentially
indistinguishable from that of ΛCDM,
except for a slightly larger present
rate of expansion compared to what
would be expected from the CMB in
ΛCDM, possibly solving the socalled
H0 tension. The matter content of
the universe is unchanged and the
coincidence problem is resolved
since it is the growth of the causal
horizon of matter that introduces
this new relativistic entropic
force. The cosmological constant is
made unnecessary and the future
hypersurface is Minkowsky rather
than de Sitter. Back 
M. Guica, Nordita and Saclay
Title:
Irrelevant currentcurrent
deformations and holography
Abstract:
In 2016,
Smirnov and Zamolodchikov
constructed a set of surprisingly
tractable irrelevant deformations of
twodimensional quantum field
theories, which appear to produce
UVcomplete QFTs, albeit nonlocal.
I will review some of the remarkable
properties of these theories, as
well as their various interesting
applications, in particular to
holography. Finally, I will argue
these QFTs are best thought of as
nonlocal versions of
twodimensional CFTs. Back 
M. Kamionkowski,
Johns Hopkins U.
Title: The
Hubble tension and the early
Universe
Abstract:
The value of the cosmic expansion
rate (the Hubble constant) inferred
from observations of supernovae
disagree with those inferred from
measurements of the cosmic microwave
background. Easy explanations for
this discrepancy have been elusive,
but the past few years attention has
turned to the possibility that a
modification to earlyUniverse
physics may be required. I will
discuss a solution to this "Hubble
tension" that involves the
introduction of a new component of
matter, “early dark energy,” as well
as other related ideas. Back 
Y. Mambrini, IJCLab,
Orsay
Title:
(Dark) matter
production in the postinflationary
phase Back 
S. Mathur, Ohio State U.
Title:
Resolution of the black hole
information paradox: The
Fuzzball Paradigm
Abstract:
We will review the basics of
the black hole information
paradox. We will then
explain how computations in
string theory yield a
resolution of this paradox.
When we make a bound state
of strings and branes, then
this bound state is found to
swell up into a horizon
sized `fuzzball'; this
fuzzball radiates like a
normal body without any
information loss. The
existence of these fuzzballs
implies a new picture for
the quantum gravitational
vacuum, where the virtual
fluctuations resemble the
scale free fluctuations at a
second order phase
transition, rather than
being confined to within the
planck scale. We will see
how this `vecro' picture of
the vacuum might give a
resolution to several
puzzles we face in
cosmology, like the origin
of energy needed for
inflation and the existence
of a cosmological constant.
Back 
S. Pascoli, Bologna
U.
Title:
Developments in neutrino physics
Abstract:
In the past twenty years, the
discovery of neutrino oscillations
has changed our understanding of
neutrinos. We now know that they
have mass and they mix and, thanks
to a broad experimental programme, a
rather precise picture has emerged
of their properties. The explanation
of neutrino masses implies new
physics beyond the Standard Model
(BSM) which is still to be unveiled.
In this talk, I will briefly review
the current knowledge of neutrino
properties, highlighting the still
open questions, with emphasis on the
nature of neutrinos, their masses
and leptonic CP violation. I will
then discuss recent developments in
sterile neutrinos searches,
including the very recent MicroBooNE
results, and their possible
implications in terms of possible
hints in favour of a dark sector
that couples to neutrinos. Back 
E. Silverstein,
Stanford U.
Title:
De Sitter Microstates from a
solvable generalization of the TTbar
deformation.
Abstract:
The
finite value of the de Sitter
entropy suggests a formulation of
its observer patch as a system with
a finitedimensional Hilbert space.
We show that a new version of the
solvable $T\bar T + \Lambda_2$
deformation of a seed holographic
CFT gives such a theory at the level
of physics accessible in pure
gravity. This is sufficient to
capture both the finite entropy 
the microstate count  along with a
subleading logarithmic correction at
large c  and the bulk dS geometry
(but it does not capture
modeldependent aspects of bulk
matter fields, which requires
additional ingredients. Back 
T. Takayanagi,
Kyoto U.
Title:
Holography and Quantum Information
Abstract:
The idea of holography in string
theory provides a simple geometric
computation of entanglement entropy.
This generalizes the wellknown
BekensteinHawking formula of black
hole entropy and strongly suggests
that a gravitational spacetime
consists of many bits of quantum
entanglement. After we give a brief
review of this field, I will report
various results on a recently
introduced quantity called pseudo
entropy, which generalizes the
entanglement entropy and has a
manifest gravity dual. Back 
Top 