CLASS_GWB: robust modeling of the astrophysical gravitational wave background anisotropies

Bellomo, Nicola; Bertacca, Daniele; Jenkins, Alexander C.; Matarrese, Sabino; Raccanelli, Alvise; Regimbau, Tania; Ricciardone, Angelo; Sakellariadou, Mairi

doi:10.48550/arxiv.2110.15059

“…All these terms have been the subject of intense study in recent years and both astrophysical and primordial contributions have been modelled extensively (see for example [107][108][109] for independent calculations of astrophysical background anisotropies and [50,102,110] for examples of primordial ones). The propagation term is often assumed to be negligible in the case of astrophysical backgrounds or it is directly included as part of the source term; in [111,112], it is expressly estimated and shown to account for at most ∼10% of the total anisotropy. In the case of a truly primordial background dating back as far as or before the CMB, however, this term will be considerably larger and will be comparable to the intrinsic anisotropies at large scales as shown in [100].…”

Section: Anisotropies In Stochastic Backgroundsmentioning

confidence: 99%

“…It was found that the angular resolution of LISA for stochastic signals highly depends on their SNR as a function of frequency, as the detector response varies greatly as a function of the latter. The stochastic signals compete with the detector noise, which at low SNR dominates the modes of the Fisher information matrix (112). Beyond this, the angular resolution at which LISA "sees" the signal is diffraction-limited; hence, the higher the frequency, the better the angular resolution will be.…”

Section: Stochastic Searches With the Laser Interferometer Space Antennamentioning

confidence: 99%

Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects

Renzini

¹

,

Goncharov

²

,

Jenkins

³

et al. 2022

Self Cite

View full text Add to dashboard Cite

The collection of individually resolvable gravitational wave (GW) events makes up a tiny fraction of all GW signals that reach our detectors, while most lie below the confusion limit and are undetected. Similarly to voices in a crowded room, the collection of unresolved signals gives rise to a background that is well-described via stochastic variables and, hence, referred to as the stochastic GW background (SGWB). In this review, we provide an overview of stochastic GW signals and characterise them based on features of interest such as generation processes and observational properties. We then review the current detection strategies for stochastic backgrounds, offering a ready-to-use manual for stochastic GW searches in real data. In the process, we distinguish between interferometric measurements of GWs, either by ground-based or space-based laser interferometers, and timing-residuals analyses with pulsar timing arrays (PTAs). These detection methods have been applied to real data both by large GW collaborations and smaller research groups, and the most recent and instructive results are reported here. We close this review with an outlook on future observations with third generation detectors, space-based interferometers, and potential noninterferometric detection methods proposed in the literature.

show abstract

“…Models predict that the GW background will present anisotropies due to the nature of spacetime along the line of sight, and for the astrophysical contribution, due to the local distribution of matter and the finitness of the number of sources. The past years a lot of work has been done to characterize anisotropies in particular in the background from CBCs [86][87][88][89][90][91][92][93][94][95].…”

Section: Anisotropymentioning

confidence: 99%

The Quest for the Astrophysical Gravitational-Wave Background with Terrestrial Detectors

Regimbau

¹

2022

Self Cite

View full text Add to dashboard Cite

We present the gravitational-wave background and its properties focusing on the background from compact binary coalescences in terrestrial detectors. We also introduce the standard data analysis method used to search for this background and discuss its detectability with second and third generation networks of detectors. To illustrate, we first use simple models and then discuss more realistic models based on simulations.

show abstract

“…All these terms have been the subject of intense study in recent years and both astrophysical and primordial contributions have been modelled extensively (see for example [108][109][110] for independent calculations of astrophysical background anisotropies and [50,103,111] for examples of primordial ones). The propagation term is often assumed to be negligible in the case of astrophysical backgrounds or it is directly included as part of the source term; in [112,113], it is expressly estimated and shown to account for at most ∼10% of the total anisotropy. In the case of a truly primordial background dating back as far as or before the CMB, however, this term will be considerably larger and will be comparable to the intrinsic anisotropies at large scales as shown in [101].…”

Section: Anisotropies In Stochastic Backgroundsmentioning

confidence: 99%

Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects

Renzini¹,

Goncharov²,

Jenkins³

et al. 2022

Preprint

Self Cite

0

View full text Add to dashboard Cite

The collection of individually resolvable gravitational wave (GW) events makes up a tiny fraction of all GW signals that reach our detectors, while most lie below the confusion limit and are undetected. Similarly to voices in a crowded room, the collection of unresolved signals gives rise to a background that is well-described via stochastic variables and, hence, referred to as the stochastic GW background (SGWB). In this review, we provide an overview of stochastic GW signals and characterise them based on features of interest such as generation processes and observational properties. We then review the current detection strategies for stochastic backgrounds, offering a ready-to-use manual for stochastic GW searches in real data. In the process, we distinguish between interferometric measurements of GWs, either by ground-based or space-based laser interferometers, and timing-residuals analyses with pulsar timing arrays (PTAs). These detection methods have been applied to real data both by large GW collaborations and smaller research groups, and the most recent and instructive results are reported here. We close this review with an outlook on future observations with third generation detectors, space-based interferometers, and potential noninterferometric detection methods proposed in the literature.

show abstract

CLASS_GWB: robust modeling of the astrophysical gravitational wave background anisotropies

Cited by 7 publications

References 132 publications

Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects

Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects

The Quest for the Astrophysical Gravitational-Wave Background with Terrestrial Detectors

Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects

Contact Info

Product

Resources

About