Séminaire / Seminar GReCO |
| « Cosmological perturbation theory of compact sources in FLRW » |
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Jahanur Hoque |
| We construct a position-space cosmological perturbation theory around spatially flat Friedmann-Lemaître-Robertson-Walker geometries that allows us to model localized sources of gravitational waves. The equations of motion are decoupled using a generalized harmonic gauge, which avoids the use of a scalar-vector-tensor decomposition. To begin with, we discuss linearized gravitational waves from compact sources on de Sitter background. We obtain the closed form expression for the metric perturbation around de Sitter spacetime up to quadrupolar order in the multipolar expansion. We emphasize that a consistent quadrupolar truncation is needed for conservation of stress-energy tensor. In the later part of my talk, we will generalize this idea for power-law cosmologies. |
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lundi 19 janvier 2026 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |