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Adiabatic or Non-Adiabatic? Unraveling the Nature of Initial Conditions in the Cosmological Gravitational Wave Background
Lorenzo Valbusa Dall'Armi, Alina Mierna, Sabino Matarrese +1
The non-thermal nature of the cosmological gravitational wave background (CGWB) makes it difficult to define the initial condition for the graviton distribution, which determines t…
Cosmological Background Interpretation of Pulsar Timing Array Data
Daniel G. Figueroa, Mauro Pieroni, Angelo Ricciardone +1
We discuss the interpretation of the detected signal by Pulsar Timing Array (PTA) observations as a gravitational wave background (GWB) of cosmological origin. We combine NANOGrav…
Unraveling the CMB lack-of-correlation anomaly with the cosmological gravitational wave background
Giacomo Galloni, Mario Ballardini, Nicola Bartolo +3
Since the very first observations, the Cosmic Microwave Background (CMB) has revealed on large-scales unexpected features known as anomalies, which challenge the standard cold…
GW_CLASS: Cosmological Gravitational Wave Background in the Cosmic Linear Anisotropy Solving System
Florian Schulze, Lorenzo Valbusa Dall'Armi, Julien Lesgourgues +5
The anisotropies of the Cosmological Gravitational Wave Background (CGWB) retain information about the primordial mechanisms that source the gravitational waves and about the geome…
Stochastic gravitational wave background from stellar origin binary black holes in LISA
Stanislav Babak, Chiara Caprini, Daniel G. Figueroa +7
We use the latest constraints on the population of stellar origin binary black holes (SOBBH) from LIGO/Virgo/KAGRA (LVK) observations, to estimate the stochastic gravitational wave…
Science with the Einstein Telescope: a comparison of different designs
Marica Branchesi, Michele Maggiore, David Alonso +73
The Einstein Telescope (ET), the European project for a third-generation gravitational-wave detector, has a reference configuration based on a triangular shape consisting of three…
Non-Gaussianity from the Cross-correlation of the Astrophysical Gravitational Wave Background and the Cosmic Microwave Background
Gabriele Perna, Angelo Ricciardone, Daniele Bertacca +1
Since the first LIGO/Virgo detection, Gravitational Waves (GWs) have been very promising as a new complementary probe to understand our Universe. One of the next challenges of GW s…
Circular Polarization of the Astrophysical Gravitational Wave Background
Lorenzo Valbusa Dall'Armi, Atsushi Nishizawa, Angelo Ricciardone +1
The circular polarization of gravitational waves is a powerful observable to test parity violation in gravity and to distinguish between the primordial or the astrophysical origin…