Journal article 446 views 54 downloads
Doppler boosting the stochastic gravitational wave background
Journal of Cosmology and Astroparticle Physics, Volume: 2022, Issue: 08, Start page: 036
Swansea University Author:
Gianmassimo Tasinato
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DOI (Published version): 10.1088/1475-7516/2022/08/036
Abstract
One of the guaranteed features of the stochastic gravitational wave background (SGWB) is the presence of Doppler anisotropies induced by the motion of the detector with respect to the rest frame of the SGWB source. We point out that kinematic effects can be amplified if the SGWB is characterised by...
| Published in: | Journal of Cosmology and Astroparticle Physics |
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| ISSN: | 1475-7516 |
| Published: |
IOP Publishing
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa60509 |
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| Abstract: |
One of the guaranteed features of the stochastic gravitational wave background (SGWB) is the presence of Doppler anisotropies induced by the motion of the detector with respect to the rest frame of the SGWB source. We point out that kinematic effects can be amplified if the SGWB is characterised by large tilts in its spectrum as a function of frequency, or by sizeable intrinsic anisotropies. Hence we examine the possibility to use Doppler effects as complementary probes of the SGWB frequency profile. For this purpose we work in multipole space, and we study the effect of kinematic modulation and aberration on the GW energy density parameter and on its angular power spectrum. We develop a Fisher forecast analysis and we discuss prospects for constraining parameters controlling kinematically induced anisotropies with future detector networks. As a case study, we apply our framework to a background component with constant slope in frequency, potentially detectable by a network of future ground-based interferometers. For this specific example, we show that a measurement of kinematic anisotropies with a network of Einstein Telescope and Cosmic Explorer will allow us to constrain the spectral shape with a precision of about 16%. We also show that, if a reconstruction of the spectral shape is done via other methods, e.g. frequency binning, a study of kinematic anisotropies can allow one to constrain our peculiar velocity with respect to the CMB frame with a precision of 30%. Finally, we identify cosmological and astrophysical scenarios where kinematic effects are enhanced in frequency ranges probed by current and future GW experiments. |
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| Keywords: |
gravitational wave detectors, gravitational waves / theory |
| College: |
Faculty of Science and Engineering |
| Funders: |
GC is funded by Swiss National Science Foundation (Ambizione Grant). GT is partially funded by the STFC grant ST/T000813/1. |
| Issue: |
08 |
| Start Page: |
036 |