Thermal Leptogenesis in Brane World Cosmology

dc.contributor.authorOkada, Nobuchika
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-05-21T20:08:27Z
dc.date.available2019-05-21T20:08:27Z
dc.date.issued2006-03-10
dc.description.abstractThe thermal leptogenesis in brane world cosmology is studied. In brane world cosmology, the expansion law is modified from the four-dimensional standard cosmological one at high temperature regime in the early universe. As a result, the well-known upper bound on the lightest light neutrino mass induced by the condition for the out-of-equilibrium decay of the lightest heavy neutrino, m̃₁≲10⁻³  eV, can be moderated to be m̃₁≲10⁻³  eV × (M₁/Tₜ)² in the case of Tₜ≤M₁ with the lightest heavy neutrino mass (M₁) and the “transition temperature” (Tₜ), at which the modified expansion law in brane world cosmology is smoothly connecting with the standard one. This implies that the degenerate mass spectrum of the light neutrinos can be consistent with the thermal leptogenesis scenario. Furthermore, as recently pointed out, the gravitino problem in supersymmetric case can be solved if the transition temperature is low enough Tₜ≲10⁶⁻⁷  GeV. Therefore, even in the supersymmetric case, thermal leptogenesis scenario can be successfully realized in brane world cosmology.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5608
dc.languageEnglish
dc.language.isoen_US
dc.subjectParticle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)
dc.subjectGravity in more than four dimensions, Kaluza-Klein theory, unified field theories; alternative theories of gravity
dc.subjectNeutrino mass and mixing
dc.titleThermal Leptogenesis in Brane World Cosmologyen_US
dc.typetext
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
NOkada_Thermal Leptogenesis in Brane World Cosmology_Physics and Astronomy.pdf
Size:
141.49 KB
Format:
Adobe Portable Document Format
Description:
Main article
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.27 KB
Format:
Item-specific license agreed upon to submission
Description: