2019
DOI: 10.1103/physrevd.100.055010
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Relaxion dark matter

Abstract: We highlight a new connection between the Standard Model hierarchy problem and the dark matter sector. The key piece is the relaxion field, which besides scanning the Higgs mass and setting the electroweak scale, also constitutes the observed dark matter abundance of the universe. The relaxation mechanism is realized during inflation, and the necessary friction is provided by particle production. Using this framework we show that the relaxion is a phenomenologically viable dark matter candidate in the keV mass… Show more

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Cited by 28 publications
(57 citation statements)
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References 97 publications
(147 reference statements)
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“…Depending on the model, fragmentation can offer an alternative stopping mechanism for the relaxion, thus offering new possibilities such as realizing the relaxion mechanism after inflation. On the other hand, fragmentation is a serious concern in models in which it is active at all times, which correspond to the scenarios where constant and sizable wiggles are present during the scanning of the Higgs mass parameter [3,4,14]. This feature makes these scenarios more constrained than the JHEP05(2020)080 ones in which the barriers only appear at the critical point where the EW symmetry is broken.…”
Section: Jhep05(2020)080mentioning
confidence: 99%
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“…Depending on the model, fragmentation can offer an alternative stopping mechanism for the relaxion, thus offering new possibilities such as realizing the relaxion mechanism after inflation. On the other hand, fragmentation is a serious concern in models in which it is active at all times, which correspond to the scenarios where constant and sizable wiggles are present during the scanning of the Higgs mass parameter [3,4,14]. This feature makes these scenarios more constrained than the JHEP05(2020)080 ones in which the barriers only appear at the critical point where the EW symmetry is broken.…”
Section: Jhep05(2020)080mentioning
confidence: 99%
“…The stopping mechanism is qualitatively different as the potential barriers are Higgs-independent and relaxation starts in the EW broken phase. The idea of using the tachyonic production of Standard Model gauge boson as a source of friction to slow down and stop the relaxion evolution was introduced in [3], and further studied in various aspects in [4,14,27,31]. Here we will only summarize the model and its constraints, referring the reader to [3,4] for further details.…”
Section: Consequences Ii: Relaxation With Vector Boson Productionmentioning
confidence: 99%
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“…Our construction involves the standard relaxion mechanism, which utilises Hubble friction to stop the relaxion. It will be interesting to see if some of our ideas can be implemented in alternative models involving particle production [29][30][31][32], which are attractive because they decouple the relaxion mechanism from inflation.…”
Section: Discussionmentioning
confidence: 99%