Dark matter and baryon asymmetry from the very dawn of the Universe

0502153 - FZÚ 2019 RIV US eng J - Journal Article
Babichev, E. - Gorbunov, D. - Ramazanov, Sabir
Dark matter and baryon asymmetry from the very dawn of the Universe.
Physical Review D. Roč. 97, č. 12 (2018), s. 1-13, č. článku 123543. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : inflaton * lepton * symmetry breaking * Hubble constan * quantum number
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 4.368, year: 2018

We propose a universal mechanism of producing dark matter and baryon (lepton) charge at the stage of the quasi-de Sitter expansion of the Universe-inflation. The key ingredient of the mechanism is a linear coupling of the field, responsible for a generation of dark matter or baryon (lepton) charge, to a function of the inflaton. During inflation this induces almost constant force dragging the corresponding field to the nonzero value. This force explicitly breaks quantum numbers associated with dark matter/baryon abundance at later stages. As a particular realization of the mechanism we introduce a superheavy complex scalar field with the mass larger than the Hubble rate during the last e-folds of inflation. The global U(1) symmetry is violated due to the linear coupling of the phase of the complex scalar to the inflaton. The symmetry breaking leads to the generation of a nonzero Noether charge. The latter is directly related to the dark matter abundance, or, alternatively, can be converted into baryon asymmetry, if the complex scalar carries the baryon charge.
Permanent Link: http://hdl.handle.net/11104/0294112