2024 CAP Congress / Congrès de l'ACP 2024

(G*) Gravitational scattering of the light emitted by the CMB due to fluctuations in the density of the universe.

27 May 2024, 15:00

15m

PAB Rm 148 (cap. 96) (Physics & Astronomy Bldg., Western U.)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Theoretical Physics / Physique théorique (DTP-DPT) (DTP) M2-2 Gravity and Cosmology | Gravité et cosmologie (DPT)

Speaker

Thomas Forget (Université de Montréal)

Description

Using quantum field theory, we calculate the total effect on the photon flux in the microwave background due to some photons being gravitationally scattered toward us and others being gravitationally scattered away from us. The scattering is produced by the density fluctuations which act like point masses in a FLRW background, which can be of either sign. The net effect of having masses of either sign is to give a Debye screening of the graviton.