A new mechanism for baryogenesis living through electroweak era
نویسندگان
چکیده
We present a new mechanism for baryogenesis by introducing a heavy vector-like SU(2)W singlet quark(s) with Qem = 2 3 quark U or Qem = −13 quark D. The lifetime of the heavy quark is assumed to be in the range 2 × 10−11 s < τ < 1 s. Being SU(2)W singlet, it survives the electroweak phase transition era. It mixes with SU(2)W doublet quarks with tiny mixing angles to satisfy the FCNC constraints, where a simple Z2 symmetry is suggested for realizing this scheme. The heavy quark asymmetry is generated in analogy with the old GUT scenario. [
منابع مشابه
Primordial Magnetic Fields and Electroweak Baryogenesis
In this contribution we will shortly review the main mechanism through which primordial magnetic fields may affect the electroweak baryogenesis. It is shown that although strong magnetic fields might enhance the strength of the electroweak phase transition, no benefit is found for baryogenesis once the effect of the field on the sphaleron rate is taken into account. The possible role of hyperma...
متن کاملBaryogenesis at the Electroweak Scale and above *
We consider origins of the baryon asymmetry which we observe today. We review the progress of electroweak-scale baryogenesis, and show a new mechanism, string-scale baryogenesis. To appear in the Proceeding of the KEK meeting on “CP violation and its origin”. † e-mail address : [email protected], JSPS research fellow.
متن کاملElectroweak baryogenesis mediated by locally supersymmetry-breaking defects
We consider the scenario of electroweak baryogenesis mediated by cosmological defect in models of supersymmetry breaking. When the effective electroweak breaking scale is raised in the defect configuration, the mechanism of electroweak baryogenesis works at a higher energy scale. The baryon charge produced by the mechanism is captured in the defect. It is protected from sphalerons and then rele...
متن کاملElectroweak Phase Transition and Baryogenesis
Our universe is apparently matter dominant. Although CP violation is experimentally proven, the full scenario of baryogenesis remains to be unsolved. Matter asymmetry is discussed briefly in this paper and electroweak phase transition (EWPT) is presented as one possible scenario of baryogenesis. Bounds on the Higgs boson mass for such scenario for Standard Model (SM) and Minimal Supersymmetric ...
متن کاملElectroweak Baryogenesis with Cosmic Strings? Electroweak Baryogenesis with Cosmic Strings?
I report on a critical analysis of the scenario of electroweak baryoge-nesis mediated by nonsuperconducting cosmic strings. This mechanism relies upon electroweak symmetry restoration in a region around cosmic strings, where sphalerons would be unsuppressed. I discuss the various problems this scenario has to face, presenting a careful computation of the sphaleron rates inside the strings, of t...
متن کامل