The standard model of cosmology, almost completely describes the early universe as well as the late time cosmology. Despite its success, there are some fundamental questions, including:
* What is the meaning, necessity and origin of the cosmological constant?
* Are the physical constants, in fact, dynamical variables?
* What is the origin of inflation and quintessence fields?
* What is the situation of the Mach's principle in cosmology?
* Many Worlds interpretation, Multiverse and Anthropic principle.
etc.

## • Fundamental problems in Early Universe and Cosmology

The standard model of cosmology, almost completely describes the early universe as well as the late time cosmology. Despite its success, there are some fundamental questions, including: * What is the meaning, necessity and origin of the cosmological constant? * Are the physical constants, in fact, dynamical variables? * What is the origin of inflation and quintessence fields? * What is the situation of the Mach's principle in cosmology? * Many Worlds interpretation, Multiverse and Anthropic principle. etc.