Ehsan Fasihi Moghaddam

Physics Department, Sharif University of Technology

Cosmological Perturbation Theory in Brane Cosmology

 

Abstract:  Brane cosmology is one of the theoretical branches of cosmology inspired by string theory and may provide some new insights into the most fundamental aspects of cosmology. On the other hand, cosmological perturbation theory is a robust framework for studying the evolution of fluctuations on top of the isotropic and homogeneous background in cosmology.

Our research combines these two arenas. Based on previous works, we will mainly concentrate on superhorizon curvature perturbation during inflation, radiation-dominated and matter-dominated eras. For this purpose, we’ll be able to cover some steps.

 First, we will review the concept of brane cosmology. Afterward, we tend to investigate cosmic inflation within the brane cosmology scenario. Finally, we will study the associated cosmological perturbation theory in the inflation, radiation-dominated and matter-dominated eras. The calculation will be within the general theory of relativity and inspired by the phenomenological models in string theory. In this talk, we introduce Brane’s cosmology briefly and then explain the ideas and works that have been done in this theory. Since the cosmological perturbation theory still needs to be fully developed for the Brane cosmology model, the possible result of this thesis may be a step toward investigating the predictions of these models through cosmological perturbation theory.

یکشنبه 7 خرداد 1402، ساعت 17:30

Sunday 28 May 2023 – 17:30 Tehran Time

Hybrid Seminar

آمفی تئاتر دانشکده فیزیک-تالار جنابPhysics Department – Amphitheater- Jenab Hall/

https://vc.sharif.edu/ch/cosmology

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