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Physics Colloquium Series


Physics Colloquium presents a venue for the latest developments in all branches of physics in a way accessible to non-expert physicists. The monthly Physics Colloquia take place on selected Wednesdays at 4:30 pm in the Conference Hall of the main Farmanieh building, with an announcement circulated in advance. Please forward your suggestions for potential Colloquium speakers to a.naji(at)ipm.ir. To subscribe to the Colloquium mailing list, please send an email with the subject line "subscribe me to physics colloquium" to physoffice(at)theory.ipm.ac.ir. 
 

Wed Apr 06, 2022 (1401/1/17)

       

Apr 06
1401/1/17

18:00
 

Uncovering Energetic Processes in the Interstellar/Intergalactic Medium with the Square Kilometre Array

Abstract:Investigating the physics and energetic of the medium where galactic structures, on various scales, are formed is the most fundamental step to understand the formation and evolution of galaxies. Modern galaxy evolution models suggest gas accretion from the intergalactic medium (IGM) or from cosmic filaments as a mechanism to maintain star formation and active galactic nucleus (AGN). Through gas heating and/or gas removal, these models also propose supernova feedback and AGN feedback as mechanisms to quench massive star formation. Observational studies, however, have not reached to a conclusive result showing that feedback can, in some cases, trigger star formation, leaving the issue as an open challenge. It seems that some basic concepts about the formation of structures in the interstellar medium (ISM) and the IGM are missed: What are physical parameters/agents governing the structure formation on various scales? How does the ISM/IGM energy balance change over cosmic time? The advent of the square kilometre array (SKA) and its instrumental capabilities tracing the most energetic ISM components has opened a new window shedding light on the issue. The SKA's sensitive radio continuum observations will trace high-energy particles and magnetic fields not only in star forming regions and AGNs, but also in more quiescent regions in molecular clouds and diffuse IGM, enabling us to study the role of magnetic fields/cosmic rays in structure formation. Sensitive radio continuum observations on large scales may also bring constrains on the entity of dark matter mapped by the Hubble Space Telescope (HST) and Dark Energy Camera (DECam).
Lecturer(s): Fatemeh Tabatabaei
From : IPM, School of Astronomy
Research Group: Physics Colloquium
More Info. : Link

Wed Mar 02, 2022 (1400/12/11)

       

Mar 02
1400/12/11

18:00
 

Dance of Cause and Effect: Fluctuation Induced Reduction of Dissipation in Classical Fluids

Abstract:About seventy years ago, G I Taylor noticed that the tails of two closely swimming spermatozoa, oscillate in a synchronized fashion as if both of them are controlled from one regulating center. The two sperms, on the other hand, has no mean of communication, but the viscous fluid in which they are swimming. To address the why question, behind the observation, he suggested the minimization of total dissipation in the viscous medium. Sixty years later, Taylors original idea was put to more detailed analytical investigations; non-intuitively, it failed to attribute the observed synchronization to the expected reduction of dissipation. We begin with a very different problem: (a) The motion of two passively trapped beads, which interact through hydrodynamic interactions, and face a driven flow. Both theoretically and experimentally we observe that they almost follow the very motion they would have, if they were to swim on their own in the opposite direction of the driven flow. Calling the phenomenon, the reverse dance, we successfully attribute it to the reduction of the total dissipation. We then (b) extend the minimalistic approach, to two sets of beads; each supposed to mimic the tail of one spermatozoon. Facing a driven flow, on top of their intrinsic oscillation, this is a minimalistic model to verify Taylors idea. The question is, does this simple model lead us to synchronization as well as reduction of fluids dissipation? And if so, can it explain why Taylors original model failed to correctly attribute synchronization with reduction of dissipation?
Lecturer(s): Seyyed Nader Rasuli
From : University of Guilan & School of Physics, IPM
Research Group: Physics Colloquium
More Info. : Link

Wed Feb 02, 2022 (1400/11/13)

       

Feb 02
1400/11/13

18:19
 

Einstein vs Einstein: The Great War

Abstract:Within the span of seven months in the midst of the Great War, Albert Einstein published two seminal papers, on "Quantum Emission and Absorption" and "Field Equations of Gravitation", that laid the foundations of modern physics. Our century-long odyssey starts here, taking us through the rise of holography, fuzzballs, firewalls, quantum chaos, and gravitational wave astronomy. However, in the end, it will land us back within those fateful seven months, where Einstein's July 1916 "Strahlungs-Emission und -Absorption nach der Quantentheorie" may prove to be the ultimate undoing of his December 1915 "Die Feldgleichungen der Gravitation". I will lay down the theoretical and observational arguments on both sides of (the latest battle) in Einstein's Great War.
Lecturer(s): Niayesh Afshordi
From : Department of Physics and Astronomy, University of Waterloo
Research Group: Physics Colloquium
More Info. : Link

Wed Jan 05, 2022 (1400/10/15)

       

Jan 05
1400/10/15

18:00
 

On Progress in Scientific Theories

Abstract:Thomas Kuhn's "theory of scientific revolutions" describes evolution in sciences from a socio-historic viewpoint, wherein paradigm shift happens as a result of a scientific revolution. According to this theory paradigm shifts are not oriented, there is no progress in scientific paradigms. In this seminar, I critically review Thomas Kuhn's theory and introduce the notion of "hyper-theory" instead of paradigm. We then discuss that not only there are meaningful ratings for scientific models, but there is also a notion of progress in theories and hyper-theories. I present and state "model of progression scientific theories" instead of Kuhn's theory.
Lecturer(s): M. M. Sheikh-Jabbari
From : IPM, School of Physics
Research Group: Physics Colloquium
More Info. : Video Link

Wed Feb 05, 2020 (1398/11/16)

       

Feb 05
1398/11/16

16:00
 

Fundamental Successes and Challenges of the Contemporary Physics
Abstract

Lecturer(s): Mehdi Golshani
From : Sharif University of Technology & IPM
Research Group: Physics Colloquium
Farmanieh Conference Hall

Wed Dec 11, 2019 (1398/9/20)

       

Dec 11
1398/9/20

16:00
 

Primordial Universe and Cosmic Inflation
Abstract
Note
Audio File

Lecturer(s): Hassan Firouzjahi
From : IPM, School of Astronomy
Research Group: Physics Colloquium
Farmanieh Conference Hall

Wed Nov 20, 2019 (1398/8/29)

       

Nov 20
1398/8/29

16:00
 

The Higgs Boson program at the LHC and future colliders
Abstract

Lecturer(s): Mojtaba Mohammadi Najafabadi
From : IPM, School of Particles and Accelerators
Research Group: Physics Colloquium
Farmanieh Conference Hall

Wed Mar 06, 2019 (1397/12/15)

       

Mar 06
1397/12/15

16:30
 

"Landau and Ginzburg" remove tensions between "Planck" and "Hubble and Lyman"
Abstract

Lecturer(s): Nima Khosravi
From : Shahid Beheshti Univ. & IPM
Research Group: Physics Colloquium
Farmanieh Seminar Room

Wed Jan 30, 2019 (1397/11/10)

       

Jan 30
1397/11/10

16:30
 

Does String Theory Avoid Its Own Swampland?
Abstract

Lecturer(s): Mohammad Mehdi Sheikh-Jabbari
From : IPM, School of Physics
Research Group: Physics Colloquium
Farmanieh Seminar Room

Wed Nov 28, 2018 (1397/9/7)

       

Nov 28
1397/9/7

16:30
 

Publicizing Science in Iran
Abstract

Lecturer(s): Yasaman Farzan
From : IPM, School of Physics
Research Group: Physics Colloquium
Farmanieh Seminar Room
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