Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Plumacher, M."'
Publikováno v:
JCAP 0908:028,2009
We study the evolution of a cosmological baryon asymmetry produced via leptogenesis by means of the full classical Boltzmann equations, without the assumption of kinetic equilibrium and including all quantum statistical factors. Beginning with the fu
Externí odkaz:
http://arxiv.org/abs/0907.0205
Autor:
Hahn-Woernle, F., Plumacher, M.
Publikováno v:
Nucl.Phys.B806:68-83,2009
We study the evolution of a cosmological baryon asymmetry in leptogenesis when the right-handed neutrinos are produced in inflaton decays. By performing a detailed numerical study over a broad range of inflaton-neutrino couplings we show that the res
Externí odkaz:
http://arxiv.org/abs/0801.3972
Publikováno v:
Nucl.Phys. B737 (2006) 176-189
We study the resonantly enhanced CP-asymmetry in the decays of nearly mass-degenerate heavy right-handed Majorana neutrinos for which different formulae have been presented in the literature, depending on the method used to calculate it. We consider
Externí odkaz:
http://arxiv.org/abs/hep-ph/0511248
Publikováno v:
New J.Phys.6:105,2004
Properties of neutrinos may be the origin of the matter-antimatter asymmetry of the universe. In the seesaw model for neutrino masses this leads to important constraints on the properties of light and heavy neutrinos. In particular, an upper bound on
Externí odkaz:
http://arxiv.org/abs/hep-ph/0406014
Publikováno v:
Annals Phys. 315 (2005) 305-351
During the process of thermal leptogenesis temperature decreases by about one order of magnitude while the baryon asymmetry is generated. We present an analytical description of this process so that the dependence on the neutrino mass parameters beco
Externí odkaz:
http://arxiv.org/abs/hep-ph/0401240
Publikováno v:
Nucl.Phys. B665 (2003) 445-468
Interactions of heavy Majorana neutrinos in the thermal phase of the early universe may be the origin of the cosmological matter-antimatter asymmetry. This mechanism of baryogenesis implies stringent constraints on light and heavy Majorana neutrino m
Externí odkaz:
http://arxiv.org/abs/hep-ph/0302092
Publikováno v:
Nucl.Phys.B643:367-390,2002; Erratum-ibid.B793:362,2008
We study the implications of thermal leptogenesis for neutrino parameters. Assuming that decays of N_1, the lightest of the heavy Majorana neutrinos, initiate baryogenesis, we show that the final baryon asymmetry is determined by only four parameters
Externí odkaz:
http://arxiv.org/abs/hep-ph/0205349
Autor:
Kachelriess, M., Plumacher, M.
We consider the high-energy behaviour of processes involving Kaluza-Klein (KK) gravitons of weak-scale string theories. We discuss how form-factors derived within string theory modify the couplings of KK gravitons and thereby lead to an exponential f
Externí odkaz:
http://arxiv.org/abs/hep-ph/0109184
Autor:
Kachelriess, M., Plumacher, M.
Publikováno v:
Phys.Rev. D62 (2000) 103006
It has been suggested that ultrahigh energy neutrinos can acquire cross-sections approaching hadronic size if the string scale is as low as 1-10 TeV. In this case, the vertical air showers observed with energies above the Greisen-Zatsepin-Kuzmin cuto
Externí odkaz:
http://arxiv.org/abs/astro-ph/0005309
Autor:
Buchmuller, W., Plumacher, M.
Publikováno v:
Phys.Rept. 320 (1999) 329-339
The cosmological baryon asymmetry can be explained as remnant of heavy Majorana neutrino decays in the early universe. We study this mechanism for two models of neutrino masses with a large \nu_\mu-\nu_\tau mixing angle which are based on the symmetr
Externí odkaz:
http://arxiv.org/abs/hep-ph/9904310