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Using a Primordial Gravitational Wave Background to Illuminate New Physics

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arxiv 1812.07577 v2 pith:J2FQ7DXF submitted 2018-12-18 astro-ph.CO gr-qchep-ph

classification astro-ph.COgr-qchep-ph
keywords gravitationalprimordialphysicsspectrumchangecolliderwavewaves
verification ladder T0 review T1 audit T2 compute T3 formal
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A primordial spectrum of gravitational waves serves as a backlight to the relativistic degrees of freedom of the cosmological fluid. Any change in the particle physics content, due to a change of phase or freeze-out of a species, will leave a characteristic imprint on an otherwise featureless primordial spectrum of gravitational waves and indicate its early-Universe provenance. We show that a gravitational wave detector such as the Laser Interferometer Space Antenna would be sensitive to physics near 100 TeV in the presence of a sufficiently strong primordial spectrum. Such a detection could complement searches at newly proposed 100 km circumference accelerators such as the Future Circular Collider at CERN and the Super Proton-Proton Collider in China, thereby providing insight into a host of beyond Standard Model issues, including the hierarchy problem, dark matter, and baryogenesis.

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  1. From new physics to a running power law and back again: Minimal refitting techniques for the reconstruction of the gravitational-wave background signal in pulsar timing array data

    gr-qc 2025-06 conditional novelty 6.0 of 10

    A new refitting technique maps any gravitational-wave background spectrum onto a running-power-law reference model via sensitivity-weighted chi-squared minimization, and uses the pullback of the reference posterior to...

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