Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers
The anisotropies of the Stochastic Gravitational-Wave Background (SGWB), produced by merging compact binaries, constitute a possible new probe of the Large-Scale Structure (LSS). However, the significant shot noise contribution caused by the discreteness of the GW sources and the poor angular resolu...
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MDPI AG
2022-03-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/3/160 |
| _version_ | 1827625050002423808 |
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| author | Giulia Capurri Andrea Lapi Carlo Baccigalupi |
| author_facet | Giulia Capurri Andrea Lapi Carlo Baccigalupi |
| author_sort | Giulia Capurri |
| collection | DOAJ |
| description | The anisotropies of the Stochastic Gravitational-Wave Background (SGWB), produced by merging compact binaries, constitute a possible new probe of the Large-Scale Structure (LSS). However, the significant shot noise contribution caused by the discreteness of the GW sources and the poor angular resolution of the instruments hampers the detection of the intrinsic anisotropies induced by the LSS. In this work, we investigate the potential of cross-correlating forthcoming high precision measurements of the SGWB energy density and the Cosmic Microwave Background (CMB) lensing convergence to mitigate the effect of shot noise. Combining a detailed model of stellar and galactic astrophysics with a novel framework to distribute the GW emitters in the sky, we compute the auto- and cross-correlation power spectra for the two cosmic fields, evaluate the shot noise contribution and predict the signal-to-noise ratio. The results of our analysis show that the SGWB energy density correlates significantly with the CMB lensing convergence and that the cross-correlation between these two cosmic fields reduces the impact of instrumental and shot noise. Unfortunately, the S/N is not high enough to detect the intrinsic SGWB anisotropies. Nevertheless, a network composed of both present and future generation GW interferometers, operating for at least 10 yrs, should be able to measure the shot noise contribution. |
| first_indexed | 2024-03-09T12:21:11Z |
| format | Article |
| id | doaj.art-c5e9184cec3d4482b21320323821044b |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T12:21:11Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-c5e9184cec3d4482b21320323821044b2023-11-30T22:40:37ZengMDPI AGUniverse2218-19972022-03-018316010.3390/universe8030160Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object MergersGiulia Capurri0Andrea Lapi1Carlo Baccigalupi2SISSA, Astrophysics and Cosmology Group, Via Bonomea 265, 34136 Trieste, ItalySISSA, Astrophysics and Cosmology Group, Via Bonomea 265, 34136 Trieste, ItalySISSA, Astrophysics and Cosmology Group, Via Bonomea 265, 34136 Trieste, ItalyThe anisotropies of the Stochastic Gravitational-Wave Background (SGWB), produced by merging compact binaries, constitute a possible new probe of the Large-Scale Structure (LSS). However, the significant shot noise contribution caused by the discreteness of the GW sources and the poor angular resolution of the instruments hampers the detection of the intrinsic anisotropies induced by the LSS. In this work, we investigate the potential of cross-correlating forthcoming high precision measurements of the SGWB energy density and the Cosmic Microwave Background (CMB) lensing convergence to mitigate the effect of shot noise. Combining a detailed model of stellar and galactic astrophysics with a novel framework to distribute the GW emitters in the sky, we compute the auto- and cross-correlation power spectra for the two cosmic fields, evaluate the shot noise contribution and predict the signal-to-noise ratio. The results of our analysis show that the SGWB energy density correlates significantly with the CMB lensing convergence and that the cross-correlation between these two cosmic fields reduces the impact of instrumental and shot noise. Unfortunately, the S/N is not high enough to detect the intrinsic SGWB anisotropies. Nevertheless, a network composed of both present and future generation GW interferometers, operating for at least 10 yrs, should be able to measure the shot noise contribution.https://www.mdpi.com/2218-1997/8/3/160cross-correlation of cosmic fieldsstochastic gravitational wave backgroundCMB lensing |
| spellingShingle | Giulia Capurri Andrea Lapi Carlo Baccigalupi Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers Universe cross-correlation of cosmic fields stochastic gravitational wave background CMB lensing |
| title | Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers |
| title_full | Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers |
| title_fullStr | Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers |
| title_full_unstemmed | Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers |
| title_short | Detectability of the Cross-Correlation between CMB Lensing and Stochastic GW Background from Compact Object Mergers |
| title_sort | detectability of the cross correlation between cmb lensing and stochastic gw background from compact object mergers |
| topic | cross-correlation of cosmic fields stochastic gravitational wave background CMB lensing |
| url | https://www.mdpi.com/2218-1997/8/3/160 |
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