Theories and Experiments for Testable Baryogenesis Mechanisms: A Snowmass White Paper

Barrow, J. L.; Broussard, Leah; Cline, James M.; Dev, P. S. Bhupal; Drewes, Marco; Elor, Gilly; Gardner, Susan; Ghiglieri, Jacopo; Harz, Julia; Kamyshkov, Yuri; Klaric, Juraj; Koerner, Lisa W.; Laurent, Benoit; McGehee, Robert; Postma, Marieke; Shakya, Bibhushan; Shrock, Robert; van de Vis, Jorinde; White, Graham

doi:10.48550/arxiv.2203.07059

Cited by 8 publications

(8 citation statements)

References 138 publications

(177 reference statements)

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“…This is similar to the result in standard leptogenesis [109] with the difference that in this model there are no vertex diagrams. The same asymmetry is obtained from ψ 1 and ψ * 1 decays, since ψ1 and ψ c 1 constitute a four-component spinor with hypercharge −4/3.…”

Section: Discussionsupporting

confidence: 89%

Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves

Gehrman¹,

Haghi²,

Sinha³

et al. 2022

Preprint

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Gravitational waves (GWs) in the MHz -GHz frequency range are motivated by a host of early Universe phenomena such as oscillons, preheating, and cosmic strings. We point out that baryogenesis too serves as a motivation to probe GWs in this frequency range. The connection is through primordial black holes (PBHs): on the one hand, PBHs induce baryogenesis by Hawking evaporating into a species that has baryon number and CP violating decays; on the other, PBHs induce GWs through second order effects when the scalar fluctuations responsible for their formation re-enter the horizon. We describe the interplay of the parameters responsible for successful baryogenesis on the plane of the strain and frequency of the induced GWs, being careful to delineate regimes where PBH domination or washout effects occur. We provide semi-analytic scalings of the GW strain with the baryon number to entropy ratio and other parameters important for baryogenesis. Along the way, we sketch a solution to the dark matter-baryogenesis coincidence problem with two populations of PBHs, which leads to a double-peaked GW signal. Our results underscore the importance of probing the ultra high frequency GW frontier.

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Section: Discussionsupporting

confidence: 89%

Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves

Gehrman¹,

Haghi²,

Sinha³

et al. 2022

Preprint

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show abstract

“…However, the predicted BAU in the SMC is vanishing. Although several potential explanations have been hitherto suggested [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] (see also models with GUT interactions [63][64][65][66]), none of them offers a full and well-accepted solution [67].…”

Section: Introductionmentioning

confidence: 99%

Baryon asymmetry from Barrow entropy: theoretical predictions and observational constraints

Luciano

Saridakis

2022

Eur. Phys. J. C

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We investigate the generation of baryon asymmetry from the corrections brought about in the Friedman equations due to Barrow entropy. In particular, by applying the gravity-thermodynamics conjecture one obtains extra terms in the Friedmann equations that change the Hubble function evolution during the radiation-dominated epoch. Hence, even in the case of standard coupling between the Ricci scalar and baryon current they can lead to a non-zero baryon asymmetry. In order to match observations we find that the Barrow exponent should lie in the interval $$0.005\lesssim \Delta \lesssim 0.008$$ 0.005 ≲ Δ ≲ 0.008 , which corresponds to a slight deviation from the standard Bekenstein–Hawking entropy. The upper bound is tighter than the one of other observational constraints, however the interesting feature is that in the present analysis we obtain a non-zero lower bound. Nevertheless this lower bound would disappear if the baryon asymmetry in Barrow-modified cosmology is generated by other mechanisms, not related to the Barrow modification.

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“…The existence of such a transition is a necessary ingredient for electroweak baryogenesis (see Ref. [526] amd references therein as well as Snowmass white papers [5,527]) and could provide a source for observable gravitational radiation. To significantly alter the SM thermal history, the new physics mass scale cannot lie too far above T EW , nor can its interactions with the SM Higgs boson be too feeble [111].…”

Section: Electroweak Phase Transitionmentioning

confidence: 99%

Detection of early-universe gravitational-wave signatures and fundamental physics

et al. 2022

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Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific questions about the Universe. In this white paper, we survey the leading early-Universe mechanisms that may produce a detectable signal—including inflation, phase transitions, topological defects, as well as primordial black holes—and highlight the connections to fundamental physics. We review the complementarity with collider searches for new physics, and multimessenger probes of the large-scale structure of the Universe.

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Theories and Experiments for Testable Baryogenesis Mechanisms: A Snowmass White Paper

Cited by 8 publications

References 138 publications

Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves

Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves

Baryon asymmetry from Barrow entropy: theoretical predictions and observational constraints

Detection of early-universe gravitational-wave signatures and fundamental physics

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