Семинар Отдела теоретической физики ИЯИ РАН-16.12.24 г.
Online Seminar, Department of Theoretical Physics, INR RAS
16th of December, 2024, 15:30 Moscow time
To be held in conference-hall, INR RAS (Pitomnik)
(with online participation via Yandex-Telemost)
Nils Albin Nilsson (SYRTE, Paris and IBS, Daejeon)
Gravitational waves and vacuum solutions with spacetime-symmetry breaking
(Please, find an annotation below)
https://telemost.yandex.ru/j/11104488949143
Abstract:
Spacetime-symmetry breaking in the gravity sector can be tightly constrained
using gravitational waves, e.g. through propagation speed and polarisation
content. In this talk, I will review some recent results in gravitational
symmetry breaking using EFT. Starting with explicit diffeomorphism violation,
I will show that it is possible to circumvent a subset of the severe no-go
constraints in the linearised-gravity limit. Nonetheless, I will show that
more no-go issues can be identified even in linearised gravity, including the
existence of an unsuppressed polarisation of gravitational waves, in contrast
to the case of spontaneous breaking, where I will show that five polarisations
appear. I will also review the possibility of obtaining exact solutions (black
holes, horizon solutions) in EFT with explicit breaking, which exhibit
interesting phenomenology and can be used to obtain further constraints.
16th of December, 2024, 15:30 Moscow time
To be held in conference-hall, INR RAS (Pitomnik)
(with online participation via Yandex-Telemost)
Nils Albin Nilsson (SYRTE, Paris and IBS, Daejeon)
Gravitational waves and vacuum solutions with spacetime-symmetry breaking
(Please, find an annotation below)
https://telemost.yandex.ru/j/11104488949143
Abstract:
Spacetime-symmetry breaking in the gravity sector can be tightly constrained
using gravitational waves, e.g. through propagation speed and polarisation
content. In this talk, I will review some recent results in gravitational
symmetry breaking using EFT. Starting with explicit diffeomorphism violation,
I will show that it is possible to circumvent a subset of the severe no-go
constraints in the linearised-gravity limit. Nonetheless, I will show that
more no-go issues can be identified even in linearised gravity, including the
existence of an unsuppressed polarisation of gravitational waves, in contrast
to the case of spontaneous breaking, where I will show that five polarisations
appear. I will also review the possibility of obtaining exact solutions (black
holes, horizon solutions) in EFT with explicit breaking, which exhibit
interesting phenomenology and can be used to obtain further constraints.
