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On Swampland Conjectures and Relations to Entropy of States

Rajabi Dahaki, Mahdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54548 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Torabian, Mahdi; Ashoorioon, Amjad
  7. Abstract:
  8. In the framework of quantum field theory, countless consistent theories can be constructed. However, it is understood that only a small subset of these theories can be consistently embedded in a theory of quantum gravity (QG). In string theory, as the best candidate for quantum gravity, there is a landscape of effective field theories (EFTs) which are descended from some compactification of extra dimensions. EFTs which are not derived from a compactification is said to belong to swampland. From a bottom-up point of view, the aim of the swampland program is to find a list of criteria which an EFT must respect so that it survives the swampland. The trans-Planckian censorship conjecture (TCC) implies that the lifetime of a de Sitter (dS) vacuum of an EFT consistent with QG is bounded, namely, it cannot be long-lived or eternal. Cosmic inflation is the dominant paradigm for the early universe and implies it has gone through a dS phase. It is best described by an EFT including potential with a positive energy. The TCC puts a tight constrain on inflationary dynamics, namely, it has limited e-folding and energy scale. On the other hand, during inflation, the quantum fluctuations seeds cosmological perturbations which have an entanglement entropy. Moreover, there are ideas that there is a bound on amount of entropy. In this dissertation, we study if the upper bound on the entropy of perturbations is related to the bound on the lifetime of cosmic inflation implied by the TCC
  9. Keywords:
  10. Inflation ; Quantum Gravity ; Swampland Conjectures ; Entropy Bound ; Quantum Field Theory

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