Baryogenesis from a modulus dominated universe

Kane, Gordon L.; Winkler, Martin Wolfgang

doi:10.1088/1475-7516/2020/02/019

Cited by 10 publications

(9 citation statements)

References 69 publications

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“…These models purport then to explain why the seemingly unrelated abundances of baryons and dark matter are comparable in the present epoch: Ω baryons /Ω DM ∼ 1/5. Starting with Thomas in 1995 [106], some relevant works include [107][108][109][110][111][112].…”

Section: Jhep02(2022)138mentioning

confidence: 99%

The cosmological moduli problem and naturalness

Bae

Baer

Barger

et al. 2022

J. High Energ. Phys.

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Nowadays, the cosmological moduli problem (CMP) comes in three parts: 1. potential violation of Big-Bang nucleosynthesis (BBN) constraints from late decaying moduli fields, 2. the moduli-induced gravitino problem wherein gravitinos are overproduced and their decays violate BBN or dark matter overproduction bounds and 3. the moduli-induced lightest SUSY particle (LSP) overproduction problem. Also, the CMP may be regarded as either a problem or else a solution to scenarios with dark matter over- or under-production. We examine the cosmological moduli problem and its connection to electroweak naturalness. We calculate the various two-body decay widths of a light modulus field into MSSM particles and gravitinos within general supersymmetric models. We include both phase space and mixing effects. We examine cases without and with helicity suppression of modulus decays to gravitinos (cases 1 & 2) and/or gauginos (cases A & B). For case B1, we evaluate regions of gravitino mass m3/2 vs. modulus mass mϕ parameter space constrained by BBN, by overproduction of gravitinos and by overproduction of neutralino dark matter, along with connections to naturalness. For this case, essentially all of parameter space is excluded unless mϕ ≳ 2.5 × 103 TeV with mϕ< 2m3/2. For a potentially most propitious case B2 with ϕ decay to Higgs and matter turned off, then modulus branching fractions to SUSY and to gravitinos become highly suppressed at large mϕ. But since the modulus number density increases faster than the branching fractions decrease, there is still gross overproduction of neutralino dark matter. We also show that in this scenario the thermally produced gravitino problem is fixed by huge entropy dilution, but non-thermal gravitino production from moduli decay remains a huge problem unless it is kinematically suppressed with mϕ< 2m3/2. In a pedagogical appendix, we present detailed calculations of modulus field two-body decay widths.

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Section: Jhep02(2022)138mentioning

confidence: 99%

The cosmological moduli problem and naturalness

Bae

Baer

Barger

et al. 2022

J. High Energ. Phys.

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“…Generating a baryon asymmetry at such low temperatures is not trivial. However, recently, several mechanisms capable of successfully generating the baryon asymmetry via φ decays have been put forward[693,694,695,696] 19. Note that, as discussed in Sec.…”

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confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

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It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe -taking place either before or after BBN -and the constraints on them, as they have been discussed in the literature during the recent years.

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“…These are in contrast with our case, where DM is first in a thermal equilibrium, then decouples from the SM plasma while relativistic, allowing for late-time interactions to be important. The dilution mechanism can be CP and baryon number violating, in which case it can also produce the baryon asymmetry [35,36]. Alternatively, the baryon asymmetry could be generated early with a much larger asymmetry, while the observed value is obtained through dilution.…”

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confidence: 99%

Light Dark Matter from Entropy Dilution

Evans

Ghalsasi

Gori

et al. 2020

J. High Energ. Phys.

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We show that a thermal relic which decouples from the standard model (SM) plasma while relativistic can be a viable dark matter (DM) candidate, if the decoupling is followed by a period of entropy dilution that heats up the SM, but not the dark sector. Such diluted hot relics can be as light as a keV, while accounting for the entirety of the DM, and not conflicting with cosmological and astrophysical measurements. The requisite dilution can be achieved via decays of a heavy state that dominates the energy budget of the universe in the early matter dominated era. The heavy state decays into the SM particles, heats up the SM plasma, and dilutes the hidden sector. The interaction required to equilibrate the two sectors in the early universe places a bound on the maximum possible dilution as a function of the decoupling temperature. As an example of diluted hot relic DM we consider a light Dirac fermion with a heavy dark photon mediator. We present constraints on the model from terrestrial experiments (current and future), astrophysics, and cosmology.ArXiv ePrint: nnnn.nnnnn

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Baryogenesis from a modulus dominated universe

Cited by 10 publications

References 69 publications

The cosmological moduli problem and naturalness

The cosmological moduli problem and naturalness

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Light Dark Matter from Entropy Dilution

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