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Gravitational wave signatures from discrete flavor symmetries

Gravitational wave signatures from discrete flavor symmetries
Gravitational wave signatures from discrete flavor symmetries
Non-Abelian discrete symmetries have been widely used to explain the patterns of lepton masses and flavor mixing. In these models,a given symmetry is assume data high scale and then is spontaneously broken by scalars (the flavons), which acquire vacuum expectation values. Typically,theresultingleadingorderpredictionsfortheoscillationparametersrequire corrections in order to comply with neutrino oscillation data. We introduce such corrections through an explicit small breaking of the symmetry. This has the advantage of solving the cosmological problems of these models without resorting to inflation. The explicit breaking induces an energy difference or “bias” between different vacua and drives the evolution of the domain walls, unavoidably produced after the symmetry breaking, towards their annihilation. Importantly, the wall annihilation leads to gravitational waves which may be observed in current and/or future experiments. We show that a distinctive pattern of gravitational waves with multiple overlapped peaks is generated when walls annihilate, which is within the reach of future detectors. We also show that cosmic walls from discrete flavor symmetries can be cosmologically safe for any spontaneous breaking scale between 1 and 1018 GeV, if the bias is chosen adequately, without the need to inflate the walls away. We use as an example a particular A4 model in which an explicit breaking is included in right-handed neutrino mass terms.
1475-7516
Gelmini, Graciela B.
c1820f20-3512-4ebf-8108-6c128b525f53
Pascoli, Silvia
725e59ab-f834-47a8-956b-2a95ff3e3628
Vitaglianoa, Edoardo
aba3e2c0-7db3-46f2-a259-1f58ce86ac82
Zhou, Ye-ling
ee7044b2-b38d-4a2d-ae3d-f1b14cf86b1b
Gelmini, Graciela B.
c1820f20-3512-4ebf-8108-6c128b525f53
Pascoli, Silvia
725e59ab-f834-47a8-956b-2a95ff3e3628
Vitaglianoa, Edoardo
aba3e2c0-7db3-46f2-a259-1f58ce86ac82
Zhou, Ye-ling
ee7044b2-b38d-4a2d-ae3d-f1b14cf86b1b

Gelmini, Graciela B., Pascoli, Silvia, Vitaglianoa, Edoardo and Zhou, Ye-ling (2020) Gravitational wave signatures from discrete flavor symmetries. Journal of Cosmology and Astroparticle Physics. (In Press)

Record type: Article

Abstract

Non-Abelian discrete symmetries have been widely used to explain the patterns of lepton masses and flavor mixing. In these models,a given symmetry is assume data high scale and then is spontaneously broken by scalars (the flavons), which acquire vacuum expectation values. Typically,theresultingleadingorderpredictionsfortheoscillationparametersrequire corrections in order to comply with neutrino oscillation data. We introduce such corrections through an explicit small breaking of the symmetry. This has the advantage of solving the cosmological problems of these models without resorting to inflation. The explicit breaking induces an energy difference or “bias” between different vacua and drives the evolution of the domain walls, unavoidably produced after the symmetry breaking, towards their annihilation. Importantly, the wall annihilation leads to gravitational waves which may be observed in current and/or future experiments. We show that a distinctive pattern of gravitational waves with multiple overlapped peaks is generated when walls annihilate, which is within the reach of future detectors. We also show that cosmic walls from discrete flavor symmetries can be cosmologically safe for any spontaneous breaking scale between 1 and 1018 GeV, if the bias is chosen adequately, without the need to inflate the walls away. We use as an example a particular A4 model in which an explicit breaking is included in right-handed neutrino mass terms.

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Gravitational wave signatures from discrete flavor symmetries - Accepted Manuscript
Restricted to Repository staff only until 26 December 2021.
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Accepted/In Press date: 26 December 2020
Additional Information: ARXIV IS AM

Identifiers

Local EPrints ID: 448075
URI: http://eprints.soton.ac.uk/id/eprint/448075
ISSN: 1475-7516
PURE UUID: 82cfae40-1da7-4b6a-aeaf-910bba1a5aea

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Date deposited: 01 Apr 2021 15:41
Last modified: 01 Apr 2021 15:41

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Contributors

Author: Graciela B. Gelmini
Author: Silvia Pascoli
Author: Edoardo Vitaglianoa
Author: Ye-ling Zhou

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