Electroweak baryogenesis and the expansion rate of the Universe
- Theory Division, CERN, 1211 Geneve 23 (Switzerland)
The standard requirement for the production of baryons at the electroweak phase transition, that the phase transition be first order and the sphaleron bound be satisfied, is predicated on the assumption of a radiation-dominated universe at that epoch. One simple alternative, domination by the energy in a kinetic mode of a scalar field which scales as 1/a{sup 6}, gives a significantly weakened sphaleron bound for the preservation of a baryon asymmetry produced at a first-order phase transition, and allows the possibility that the observed baryon asymmetry be produced when the phase transition is second order or crossover. Such a phase of {open_quotes}kination{close_quotes} at the electroweak scale can occur in various ways as a scalar field evolves after inflation in an exponential potential. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 467469
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 4 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
A way to reopen the window for electroweak baryogenesis.
Magnetic fields at first order phase transition: a threat to electroweak baryogenesis
Strong CP violation, electroweak baryogenesis, and axionic dark matter
Journal Article
·
Mon Dec 31 23:00:00 EST 2001
· J. High Energy Phys.
·
OSTI ID:949544
Magnetic fields at first order phase transition: a threat to electroweak baryogenesis
Journal Article
·
Sat Oct 01 00:00:00 EDT 2011
· Journal of Cosmology and Astroparticle Physics
·
OSTI ID:22279692
Strong CP violation, electroweak baryogenesis, and axionic dark matter
Journal Article
·
Tue Jan 14 23:00:00 EST 1992
· Physical Review, D (Particles Fields); (United States)
·
OSTI ID:5081862