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Books > Science & Mathematics > Physics > Quantum physics (quantum mechanics)
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The B L Phase Transition - Implications for Cosmology and Neutrinos (Hardcover, 2014 ed.)
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The B L Phase Transition - Implications for Cosmology and Neutrinos (Hardcover, 2014 ed.)
Series: Springer Theses
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Several of the very foundations of the cosmological standard model
the baryon asymmetry of the universe, dark matter, and the origin
of the hot big bang itself still call for an explanation from the
perspective of fundamental physics. This workadvocates one
intriguing possibility for a consistent cosmology that fills in the
theoretical gaps while being fully in accordance with the
observational data. At very high energies, the universe might have
been in a false vacuum state that preserved B-L, the difference
between the baryon number B and the lepton number L as a local
symmetry. In this state, the universe experienced a stage of hybrid
inflation that only ended when the false vacuum became unstable and
decayed, in the course of a waterfall transition, into a phase with
spontaneously broken B-L symmetry. This B-L Phase Transition was
accompanied by tachyonic preheating that transferred almost the
entire energy of the false vacuum into a gas of B-L Higgs bosons,
which in turn decayed into heavy Majorana neutrinos. Eventually,
these neutrinos decayed into massless radiation, thereby producing
the entropy of the hot big bang, generating the baryon asymmetry of
the universe via the leptogenesis mechanism and setting the stage
for the production of dark matter. Next to a variety of conceptual
novelties and phenomenological predictions, the main achievement of
the thesis is hence the fascinating notion that the leading role in
the first act of our universe might have actually been played by
neutrinos.
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