How Lensed Gravitational Waves Can Illuminate Dark Matter
Mesut Caliskan
APA
(2024). dRGT ghost-free massive gravity in spherical symmetry. Perimeter Institute. https://pirsa.org/24110075
MLA
dRGT ghost-free massive gravity in spherical symmetry. Perimeter Institute, Nov. 19, 2024, https://pirsa.org/24110075
BibTex
@misc{ pirsa_PIRSA:24110075,
doi = {10.48660/24110075},
url = {https://pirsa.org/24110075},
author = {},
keywords = {Cosmology},
language = {en},
title = {dRGT ghost-free massive gravity in spherical symmetry},
publisher = {Perimeter Institute},
year = {2024},
month = {nov},
note = {PIRSA:24110075 see, \url{https://pirsa.org}}
}
Abstract
In my talk, I will argue that symmetry strongly changes the behaviour of massive gravity relative to its massless sibling.
After reviewing the formulation of dRGT theory of ghost-free massive gravity, I will examine the minimal model and next-to-minimal model in spherical symmetry.
Although the latter has been argued to have a good Vainshtein mechanism in spherical symmetry, I will derive a restriction on non-relativistic matter that is at odds with a reasonable phenomenology. Moreover, the theory cannot reproduce the same behaviour as GR for a scalar field collapse in the small mass limit without encountering a singularity at some point in the evolution.
Since symmetry is the epitome of non-genericity, the resolution may well be that we should forgo symmetry and focus on more generic behaviour in massive gravity to study the screening mechanism.
This talk is based on https://arxiv.org/pdf/2409.18802
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