Publications

Citation

BibTex format

@article{Figueroa:2024:10.1103/PhysRevLett.132.171002,
author = {Figueroa, DG and Pieroni, M and Ricciardone, A and Simakachorn, P},
doi = {10.1103/PhysRevLett.132.171002},
journal = {Phys Rev Lett},
title = {Cosmological Background Interpretation of Pulsar Timing Array Data.},
url = {http://dx.doi.org/10.1103/PhysRevLett.132.171002},
volume = {132},
year = {2024}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We discuss the interpretation of the detected signal by pulsar timing array (PTA) observations as a gravitational wave background of cosmological origin. We combine NANOGrav 15-years and EPTA-DR2new datasets and confront them against backgrounds from supermassive black hole binaries (SMBHBs), and cosmological signals from inflation, cosmic (super)strings, first-order phase transitions, Gaussian and non-Gaussian large scalar fluctuations, and audible axions. We find that scalar-induced, and to a lesser extent audible axion and cosmic superstring signals, provide a better fit than SMBHBs. These results depend, however, on modeling assumptions, so further data and analysis are needed to reach robust conclusions. Independently of the signal origin, the data strongly constrain the parameter space of cosmological signals, for example, setting an upper bound on primordial non-Gaussianity at PTA scales as |f_{nl}|2.34 at 95% C.L.
AU  - Figueroa,DG
AU  - Pieroni,M
AU  - Ricciardone,A
AU  - Simakachorn,P
DO  - 10.1103/PhysRevLett.132.171002
PY  - 2024///
TI  - Cosmological Background Interpretation of Pulsar Timing Array Data.
T2  - Phys Rev Lett
UR  - http://dx.doi.org/10.1103/PhysRevLett.132.171002
UR  - https://www.ncbi.nlm.nih.gov/pubmed/38728738
VL  - 132
ER  -
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