Filtered baryogenesis

Baker, Michael J.; Breitbach, Moritz; Mittnacht, Lukas; Soreq, Yotam

doi:10.1007/jhep08(2022)010

Cited by 9 publications

(4 citation statements)

References 87 publications

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“…2 One might concern that in case of M 1 /T p 1 the RHNs do not have sufficient energy to cross the wall, as the average kinetic energy of ν R is O(T p ). Were that true, most of the RHNs will be trapped in the old vacuum [27][28][29][30][31], and only a tiny fraction of them can be "filtered" to the new vacuum [32][33][34][35], resulting in a much suppressed ν R number density in the φ = 0 phase, and the resultant BAU is also negligible, as pointed out in [26,36]. This issue, however, can be solved, provided that the bubbles are expanding in an ultrarelativistic velocity, i.e.…”

Section: Jhep09(2022)052mentioning

confidence: 99%

Leptogenesis triggered by a first-order phase transition

Huang

Xie

2022

J. High Energ. Phys.

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We propose a new scenario of leptogenesis, which is triggered by a first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are massless in the old vacuum, while they acquire a mass in the new vacuum bubbles, and the mass gap is huge compared with the FOPT temperature. The ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs experience fast decay and generate the lepton asymmetry, which is further converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out of equilibrium inside the bubble, the generated BAU does not suffer from the thermal bath washout. We first discuss the general feature of such a FOPT leptogenesis mechanism, and then realize it in an extended B − L model. The gravitational waves from U(1)B−L breaking could be detected at the future interferometers.

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Section: Jhep09(2022)052mentioning

confidence: 99%

Leptogenesis triggered by a first-order phase transition

Huang

Xie

2022

J. High Energ. Phys.

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“…See refs [52][53][54]. for other baryogenesis and dark matter mechanisms involving particle trapping, and refs [55][56][57][58][59][60][61][62][63][64][65].…”

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confidence: 99%

First-order phase transition and fate of false vacuum remnants

Kawana

Xie

2022

J. Cosmol. Astropart. Phys.

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False vacuum remnants in first-order phase transitions in the early Universe can form compact objects which may constitute dark matter. Such remnants form because particles develop large mass gaps between the two phases and become trapped in the old phase. We focus on remnants generated in a class of models with trapped dark sector particles, trace their development, and determine their ultimate fate. Depending on model and phase transition parameters, the evolutionary endpoint of these remnants can be primordial black holes, Fermi-balls, Q-balls, or thermal balls, and they all have the potential to constitute some portion or the whole of dark matter within a broad mass range. Notably, dark sector thermal balls can remain at high temperatures until the present day and are a new compact dark matter candidate which derives its energy from the thermal energy of internal particles instead of their mass or quantum pressure.

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“…2 While many of our findings will be applicable to any type of Dark Big Bang phase transition, we will focus on the case, where the Dark Big Bang is associated with a first-order phase transition. Several dark matter realizations connected to a first-order phase transition have previously been discussed in the literature which include the formation of heavy dark matter by bubble collisions [12][13][14][15][16] or bubble expansion [17], asymmetric dark matter [18][19][20][21], Q-ball dark matter [22,23], Fermi ball dark matter [24][25][26], quark nugget dark matter [27][28][29][30][31][32][33][34], filtered dark matter [35,36] and primordial black hole dark matter [37][38][39][40][41][42][43][44][45] 3 . Our Dark Big Bang proposal differs from these complementary ideas because we are considering the false vacuum decay into a dark particle plasma within a decoupled previously cold dark sector (such that the Dark Big Bang is the dark sector analogue of the Hot Big Bang).…”

Section: Hot Big Bang Cosmologymentioning

confidence: 99%

Dark Matter and Gravity Waves from a Dark Big Bang

Freese¹,

Winkler²

2023

Preprint

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The Hot Big Bang is often considered as the origin of all matter and radiation in the Universe. Primordial nucleosynthesis (BBN) provides strong evidence that the early Universe contained a hot plasma of photons and baryons with a temperature T > MeV. However, the earliest probes of dark matter originate from much later times around the epoch of structure formation. In this work we describe a scenario in which dark matter (and possibly dark radiation) can be formed around or even after BBN in a second Big Bang which we dub the "Dark Big Bang". The latter occurs through a phase transition in the dark sector which transforms dark vacuum energy into a hot dark plasma of particles; in this paper we focus on a first-order phase transition for the Dark Big Bang. The correct dark matter abundance can be set by dark matter cannibalism or by pair-annihilation within the dark sector followed by a thermal freeze-out. Alternatively ultra-heavy "dark-zilla" dark matter can originate directly from bubble collisions during the Dark Big Bang. We will show that the Dark Big Bang is consistent with constraints from structure formation and the Cosmic Microwave Background (CMB) if it occurred when the Universe was less than one month old, corresponding to a temperature in the visible sector above O(keV). While the dark matter evades direct and indirect detection, the Dark Big Bang gives rise to striking gravity wave signatures to be tested at pulsar timing array experiments. Furthermore, the Dark Big Bang allows for realizations of self-interacting and/or warm dark matter which suggest exciting discovery potential in future small-scale structure observations.

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Filtered baryogenesis

Cited by 9 publications

References 87 publications

Leptogenesis triggered by a first-order phase transition

Leptogenesis triggered by a first-order phase transition

First-order phase transition and fate of false vacuum remnants

Dark Matter and Gravity Waves from a Dark Big Bang

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