Séminaire

Sidestepping the inversion of the weak-lensing covariance matrix with likelihood-free inference

Beyond the Standard Models with Cosmic Strings

Cosmic strings (CS) are topological defects formed after spontaneous breaking of a U(1) symmetry. Remarkably, thanks to the scaling regime, CS loops constitute a long-standing source of Gravitational Waves (GW) and produce a flat GW spectrum during radiation domination, spanning many orders of magnitude in frequency.

Gravitation Seminar: Etienne Savalle, The DAMNED experiment

The gravitation group is inviting you to the following seminar:

The DAMNED experiment: Space-time separated clock experiment searching for u

Exsqueez : Frequency dependent squeezing under vacuum for Virgo

Over the years gravitational waves detectors have increased their sensitivity and are now more and more limitated by the standard quantum limit.

Séminaire Gravitation - Giulia Cusin, Astrophysical background of gravitational waves: anisotropies, polarization and cross-correlations with cosmological observables.

Le groupe Gravitation organise le séminaire suivant le lundi 24 février à 11h, par Giulia Cusin, dans la salle 631B de l’APC.

Astrophysical background of gravitational waves: anisotropies, polarization and cross-correlations with cosmological observables.

The astrophysical background of gravitational waves (AGWB) is composed by the incoherent superposition of gravita

Cosmology with peculiar velocities

The Universe is not homogenous. Since the early times, its structures have grown and moved under the laws of gravity. By measuring these motions today we are able to trace the spatial distribution of dark matter and accurately map the Universe.

The Diffuse Supernova Neutrino Background in Super-Kamiokande

Neutrinos have played a key role in astrophysics, from the characterization of nuclear fusion processes in the Sun to the observation of supernova SN1987A and multiple extragalactic events. The Super-Kamiokande experiment has played a major part in past in these astrophysical studies by investigating low energy O(10)~MeV neutrinos, and currently exhibits the best sensitivity to the diffuse neutrino background from distant supernovae.

Cosmology as a CFT1

Over the last decades, the emergence of conformal symmetry in gravitational systems has provided a powerful tool to investigate new aspects in classical, semi-classical and quantum general relativity.

Observational signatures of multifield inflation

Slow-roll single-field inflation constitutes the main paradigm of the
Early Universe.

Relieving the Hubble tension with primordial magnetic fields

The standard cosmological model determined from the accurate cosmic microwave background measurements made by the Planck satellite implies a value of the Hubble constant H0 that is 4.4 standard deviations lower than the one determined from Type Ia supernovae. The Planck best fit model also predicts lower values of the matter density fraction Om and clustering amplitude S8 compared to those obtained from the Dark Energy Survey Year 1 data.

Séminaire