Moscow International School of Physics 2020

Notes on quantum fields in Static patch of de Sitter space

5 Mar 2020, 20:00

2h

HSE Study Center “Voronovo”

Board: 5

Poster [portrait A1 or landscape A0] Young Scientist Forum Poster Session

Speaker

Kirill Bazarov (MIPT)

Description

We show the explicit mode expansion of tree-level propagators in Static (or Compact) Patch of de Sitter space. We construct propagator for thermal state corresponding to arbitrary temperature $T$. We show that the propagator that respects the de Sitter isometry corresponds to the thermal state with $T=(2\pi {)}^{-1}$ in the units of de Sitter curvature. Which confirms the old and well known result, making it a bit more explicit. Propagators with $T\ne (2\pi {)}^{-1}$ do not respect the isometry. Moreover, we show that propagators with $T\ne (2\pi {)}^{-1}$ have extra singularities on the boundary of the Static Patch, as opposed to the case of $T=(2\pi {)}^{-1}$. We discuss physical meaning of these observations.
We also discuss loop corrections to the propagators in the Static patch and their physical meaning both for $T=(2\pi {)}^{-1}$ and $T\ne (2\pi {)}^{-1}$.

Presentation materials

VORONOVOO.pdf