Primordial Baryon Asymmetry and Sphalerons
نویسنده
چکیده
I show that a cosmological baryon asymmetry generated at the GUT scale is in general safe against washout due to sphalerons and generic Bor L-violating effects. This result is mainly due to the (almost) conserved number of right-handed electrons at high temperatures T > ∼ O(10) TeV, but also the mass corrections, in particular the thermal masses of leptons act as the protector of the primordial baryon asymmetry.
منابع مشابه
Protecting the primordial baryon asymmetry from erasure by sphalerons.
If the baryon asymmetry of the universe was created at the GUT scale, sphalerons together with exotic sources of (B L)-violation could have erased it, unless the latter satisfy stringent bounds. We elaborate on how the small Yukawa coupling of the electron drastically weakens previous estimates of these bounds.
متن کاملFtuam-93-07 Neip93-001 Baryon Asymmetry, Supersymmetry and Gravitational Anomalies ∗
We discuss two independent issues about the baryon asymmetry of the universe. First, assuming that it is generated by an unspecified source at high temperatures, we study the effects of non-perturbative SU(2)W dynamics above the electroweak scale, in the context of supersymmetric models. We find that there is a substantial difference with the nonsupersymmetric case with the net effect of relaxi...
متن کاملStrong Sphalerons and Electroweak Baryogenesis
We analyze the spontaneous baryogenesis and charge transport mechanisms suggested by Cohen, Kaplan and Nelson for baryon asymmetry generation in extended versions of electroweak theory. We find that accounting for non-perturbative chiralitybreaking transitions due to strong sphalerons reduces the baryonic asymmetry by the factor (mt/πT ) 2 or αW , provided those processes are in thermal equilib...
متن کاملOn Preserving a B + L Asymmetry Produced in the Early Universe
One of the most efficient mechanisms for producing the baryon asymmetry of the Universe is the decay of scalar condensates in a SUSY GUT as was first suggested by Affleck and Dine. We show that given a large enough asymmetry, the baryon number will be preserved down to low temperatures even if B − L = 0, because the baryon number carrying scalars form bose condensates that give the W a mass. We...
متن کاملErasure and regeneration of the primordial baryon asymmetry by sphalerons.
We show that a cosmological baryon asymmetry generated at the GUT scale, which would be destroyed at lower temperatures by sphalerons and possible new Bor L-violating effects, can naturally be preserved by an asymmetry in the number of right-handed electrons. This results in a significant softening of previously derived baryogenesis-based constraints on the strength of exotic Bor L-violating in...
متن کامل