“Stairway to Heaven” — Spectroscopy of Particle Couplings with Gravitational Waves. (arXiv:2202.05805v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Figueroa_D/0/1/0/all/0/1">Daniel G. Figueroa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Florio_A/0/1/0/all/0/1">Adrien Florio</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Loayza_N/0/1/0/all/0/1">Nicolas Loayza</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pieroni_M/0/1/0/all/0/1">Mauro Pieroni</a>
We discuss the possibility to measure particle couplings with stochastic
gravitational wave backgrounds (SGWBs). Under certain circumstances a sequence
of peaks of different amplitude and frequency — a $stairway$ — emerges in a
SGWB spectrum, with each peak probing a different coupling. The detection of
such signature opens the possibility to reconstruct couplings (spectroscopy) of
particle species involved in high energy phenomena generating SGWBs.
Stairway-like signatures may arise in causally produced backgrounds in the
early Universe, e.g. from preheating or first order phase transitions. As a
proof of principle we study a preheating scenario with an inflaton $phi$
coupled to multiple $daughter$ fields $lbrace chi_j rbrace$ with different
coupling strengths. As a clear stairway signature is imprinted in the SGWB
spectrum, we reconstruct the relevant couplings with various detectors.
We discuss the possibility to measure particle couplings with stochastic
gravitational wave backgrounds (SGWBs). Under certain circumstances a sequence
of peaks of different amplitude and frequency — a $stairway$ — emerges in a
SGWB spectrum, with each peak probing a different coupling. The detection of
such signature opens the possibility to reconstruct couplings (spectroscopy) of
particle species involved in high energy phenomena generating SGWBs.
Stairway-like signatures may arise in causally produced backgrounds in the
early Universe, e.g. from preheating or first order phase transitions. As a
proof of principle we study a preheating scenario with an inflaton $phi$
coupled to multiple $daughter$ fields $lbrace chi_j rbrace$ with different
coupling strengths. As a clear stairway signature is imprinted in the SGWB
spectrum, we reconstruct the relevant couplings with various detectors.
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