Journal Article

PUBDB-2026-00532

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png CP-violation in production of heavy neutrinos from bubble collisions

Cataldi, M. (Corresponding author)Extern*DESY* ; Müürsepp, K. ; Vanvlasselaer, M.

2026
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1007/JHEP01(2026)058  doi:10.3204/PUBDB-2026-00532

Report No.: DESY-25-082; arXiv:2506.12123

Abstract: First order phase transitions (FOPT) in the early Universe can be powerful emitters of both relativistic and heavy particles, upon the collision of ultra-relativistic bubble shells. If the particles coupling to the bubble wall have CP-violating interactions, the same collision process can also create a local lepton or baryon charge. This CP-violation can originate from different channels, which have only been partially addressed in the literature. We present a systematic analysis of the different channels inducing CP-violation during bubble collisions: 1) the decay of heavy particles 2) the production of heavy particles and 3) the production of light and relativistic Standard Model (SM) particles.As an illustration of the impact that such mechanisms can have on baryon number and dark matter (DM) abundance, we then introduce a simple model of cogenesis, separating a positive and a negative lepton number in the SM and a dark sector. The lepton number asymmetry in the SM can be used to explain the baryon asymmetry of the Universe (BAU), while the opposite asymmetry in the dark sector is responsible for determining the abundance of DM. Moreover, the masses of light neutrinos can be understood via the inverse seesaw mechanism, with the lepton-violating Majorana mass originating from the FOPT.A typical signal produced by a FOPT is the irreducible gravitational wave (GW) background. We find that a substantial portion of the parameter space can be probed at future observatories like the Einstein Telescope (ET).

Keyword(s): Baryo-and Leptogenesis ; Cosmology of Theories BSM ; Early Universe Particle Physics ; Phase Transitions in the Early Universe

Note: 34 pages, 8 figures; matches published JHEP version

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Contributing Institute(s):

1. Uni Hamburg / Theorie (UNI/TH)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Das Quantisierte Universum II (390833306) (390833306)

Experiment(s):

1. No specific instrument

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Cataldi, M. (Corresponding author)Extern*DESY* ; Müürsepp, K. ; Vanvlasselaer, M.
CP-violation in production of heavy neutrinos from bubble collisions
[10.3204/PUBDB-2026-00465]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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