Gravity wave signals from early matter domination: interpolating between fast and slow transitions
Gravity wave signals from early matter domination: interpolating between fast and slow transitions
An epoch of matter domination in the early universe can enhance the primordial stochastic gravitational wave signal, potentially making it detectable to upcoming gravitational wave experiments. However, the resulting gravitational wave signal is quite sensitive to the end of the early matter-dominated epoch. If matter domination ends gradually, a cancellation results in an extremely suppressed signal, while in the limit of an instantaneous transition, there is a resonant-like enhancement. The end of the matter dominated epoch cannot be instantaneous, however, and previous analyses have used a Gaussian smoothing technique to account for this, and consider only a limited regime around the fast transition limit. In this work, we present a study of the enhanced gravitational wave signal from early matter domination without making either approximation and show how the signal smoothly evolves from the strongly suppressed to strongly enhanced regimes.
astro-ph.CO, gr-qc, hep-ph
Pearce, Matthew
0ce3f673-997e-4555-a148-8c556c014a4a
Pearce, Lauren
d4bc45df-b75d-428b-82cc-bdfd3aad78ac
White, Graham
652445c5-e1e5-4ff7-84e1-a3bca45e75d0
Balázs, Csaba
9112535d-e793-4c3c-91a1-52ce80728e8a
Pearce, Matthew
0ce3f673-997e-4555-a148-8c556c014a4a
Pearce, Lauren
d4bc45df-b75d-428b-82cc-bdfd3aad78ac
White, Graham
652445c5-e1e5-4ff7-84e1-a3bca45e75d0
Balázs, Csaba
9112535d-e793-4c3c-91a1-52ce80728e8a
[Unknown type: UNSPECIFIED]
Abstract
An epoch of matter domination in the early universe can enhance the primordial stochastic gravitational wave signal, potentially making it detectable to upcoming gravitational wave experiments. However, the resulting gravitational wave signal is quite sensitive to the end of the early matter-dominated epoch. If matter domination ends gradually, a cancellation results in an extremely suppressed signal, while in the limit of an instantaneous transition, there is a resonant-like enhancement. The end of the matter dominated epoch cannot be instantaneous, however, and previous analyses have used a Gaussian smoothing technique to account for this, and consider only a limited regime around the fast transition limit. In this work, we present a study of the enhanced gravitational wave signal from early matter domination without making either approximation and show how the signal smoothly evolves from the strongly suppressed to strongly enhanced regimes.
Text
2311.12340v1
- Author's Original
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e-pub ahead of print date: 21 November 2023
Keywords:
astro-ph.CO, gr-qc, hep-ph
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Local EPrints ID: 485087
URI: http://eprints.soton.ac.uk/id/eprint/485087
PURE UUID: 9ce433a9-a749-4295-9d93-07a412444680
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Date deposited: 29 Nov 2023 17:34
Last modified: 17 Mar 2024 06:10
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Author:
Matthew Pearce
Author:
Lauren Pearce
Author:
Graham White
Author:
Csaba Balázs
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