Details
| Original language | English |
|---|---|
| Article number | 041 |
| Number of pages | 27 |
| Journal | Journal of Cosmology and Astroparticle Physics |
| Volume | 2023 |
| Issue number | 10 |
| Publication status | Published - 12 Oct 2023 |
Abstract
Keywords
- gravitational waves / theory, inflation, primordial black holes, primordial gravitational waves (theory)
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Astronomy and Astrophysics
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In: Journal of Cosmology and Astroparticle Physics, Vol. 2023, No. 10, 041, 12.10.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Scalar-induced gravitational wave interpretation of PTA data
T2 - the role of scalar fluctuation propagation speed
AU - Balaji, Shyam
AU - Domènech, Guillem
AU - Franciolini, Gabriele
PY - 2023/10/12
Y1 - 2023/10/12
N2 - Pulsar timing arrays gathered evidence of the presence of a gravitational wave background around nHz frequencies. If the gravitational wave background was induced by large and Gaussian primordial fluctuations, they would then produce too many sub-solar mass primordial black holes. We show that if at the time of gravitational wave generation the universe was dominated by a canonical scalar field, with the same equation of state as standard radiation but a higher propagation speed of fluctuations, one can explain the gravitational wave background with a primordial black hole counterpart consistent with observations. Lastly, we discuss possible ways to test this model with future gravitational wave detectors.
AB - Pulsar timing arrays gathered evidence of the presence of a gravitational wave background around nHz frequencies. If the gravitational wave background was induced by large and Gaussian primordial fluctuations, they would then produce too many sub-solar mass primordial black holes. We show that if at the time of gravitational wave generation the universe was dominated by a canonical scalar field, with the same equation of state as standard radiation but a higher propagation speed of fluctuations, one can explain the gravitational wave background with a primordial black hole counterpart consistent with observations. Lastly, we discuss possible ways to test this model with future gravitational wave detectors.
KW - gravitational waves / theory
KW - inflation
KW - primordial black holes
KW - primordial gravitational waves (theory)
UR - http://www.scopus.com/inward/record.url?scp=85175467339&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2307.08552
DO - 10.48550/arXiv.2307.08552
M3 - Article
AN - SCOPUS:85175467339
VL - 2023
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 10
M1 - 041
ER -