Baryogenesis via relativistic bubble expansion

被引：49

作者：

Baldes, Iason ^{[1
]}

Blasi, Simone ^{[2
,3
]}

Mariotti, Alberto ^{[2
,3
]}

Sevrin, Alexander ^{[3
,4
]}

Turbang, Kevin ^{[4
,5
]}

机构：

[1] Univ Libre Bruxelles, Serv Phys Theor, Blvd Triomphe,CP225, B-1050 Brussels, Belgium

[2] Vrije Univ Brussel, Theoretische Nat & IIHE ELEM, P Laan 2, B-1050 Brussels, Belgium

[3] Vrije Univ Brussel, Int Solvay Inst, Pl Laan 2, B-1050 Brussels, Belgium

[4] Vrije Univ Brussel, Theoret Nat Kunde, Pl Laan 2, B-1050 Brussels, Belgium

[5] Univ Antwerp, Prinsstr 13, B-2000 Antwerp, Belgium

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 11期

关键词：

1ST-ORDER PHASE-TRANSITIONS; GRAVITATIONAL-WAVES; SYMMETRY-BREAKING; NEUTRINO MASS; FALSE VACUUM; LEPTOGENESIS; MATTER; CONSEQUENCES; CONSTRAINTS; GENERATION;

D O I：

10.1103/PhysRevD.104.115029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a novel baryogenesis mechanism in which the asymmetry is sourced from heavy particles which either gain their mass or are created during bubble expansion in a strong first order phase transition. These particles then decay in a CP and baryon number violating way inside the bubble. The particles are inherently out of equilibrium and sufficiently dilute after wall crossing so the third Sakharov condition is easily met. Washout is avoided provided the reheat temperature is sufficiently below the scale of the heavy particles. The mechanism relies on moderate supercooling and relativistic walls which-in contrast to electroweak baryogenesis-generically leads to a sizable gravitational wave signal, although in the simplest realizations at frequencies beyond upcoming detectors. We present a simple example model and discuss the restrictions on the parameter space for the mechanism to be successful. We find that high reheat temperatures TRH greater than or similar to 10(10) GeV are generally preferred, whereas stronger supercooling allows for temper-atures as low as TRH similar to 10(6) GeV, provided the vacuum energy density is sufficiently suppressed. We briefly comment on using resonantly enhanced CP violation to achieve even lower scales.

引用

页数：24

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