Cinquième Assemblée Générale du GdR Ondes Gravitationnelles

Session

Groupe de Travail: COSMOLOGIE

11 oct. 2021, 15:00

LAPP - Laboratoire d'Annecy de Physique des Particules

15. Recent advances in gravitational-wave cosmology

Simone Mastrogiovanni (Astroparticule et cosmologie, Paris Diderot university)

11/10/2021 15:00

COSMOLOGIE

Standard sirens have been the central paradigm in gravitational-wave (GW)
cosmology so far. From the GW signature of compact star binaries, it is
possible to directly measure the luminosity distance of the source.
Since the source redshift cannot be inferred from the GW signal alone,
additional information is required for instance from the observation of
an electromagnetic counterpart....

28. Cross-correlating galaxy catalogs and gravitational waves: a tomographic approach

Francesca Calore (LAPTh, CNRS)

11/10/2021 15:15

COSMOLOGIE

Unveiling the origin of the coalescing binaries detected via gravitational waves (GW) is challenging, notably if no multi-wavelength counterpart is detected. One important diagnostic tool is the coalescing binary distribution with respect to the large scale structures (LSS) of the universe, which one can quantify via the cross-correlation of galaxy catalogs with GW ones.
I will present...

16. Cosmology with Dark GW Sirens and the importance of population assumptions

Konstantin Leyde (APC Université de Paris)

11/10/2021 15:30

COSMOLOGIE

Gravitational waves (GWs) from compact binary coalesces are cosmological standard sirens and provided with an electromagnetic (EM) counterpart can be used to probe cosmology. With the rapid increase of GW detector sensitivity, it will be less and less likely that GW sources are accompanied by an EM counterpart. Furthermore, the completeness of galaxy catalogs rapidly decreases and the...

2. Turbulent production of polarized gravitational radiation from primordial helical magnetic fields

Alberto Roper Pol (APC)

11/10/2021 15:45

COSMOLOGIE

The generation of primordial magnetic fields and its interaction with the primordial plasma during cosmological phase transitions is turbulent in nature. I will describe and discuss results of direct numerical simulations of magnetohydrodynamic (MHD) turbulence in the early universe and the resulting stochastic gravitational wave background (SGWB). In addition to the SGWB, the primordial...

30. Constraining higher-dimensional cosmology with gravitational wave standard sirens

Nicola Tamanini (L2I Toulouse, CNRS/IN2P3)

11/10/2021 16:30

COSMOLOGIE

The propagation of gravitational waves (GWs) at cosmological distances offers a new way to test the gravitational interaction at the largest scales. In this talk I will consider a homogeneous and isotropic cosmology with extra spatial dimensions at large scales, which represents a simple phenomenological prototype for extra-dimensional modified gravity cosmological models. By assuming that...