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Author  |
Garcia-Cely, C.; Landini, G.; Zapata, O. |
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Title |
Dark matter in QCD-like theories with a theta vacuum: Cosmological and astrophysical implications |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
111 |
Issue |
6 |
Pages |
063044 - 13pp |
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Abstract |
Quantum chromodynamics (QCD)-like theories in which the dark matter (DM) of the Universe is hypothesized to be a thermal relic in the form of a dark pion has been extensively investigated, with most studies neglecting the CP-violating 0-angle associated with the topological vacuum. We point out that a nonvanishing 0 could potentially trigger resonant number-changing processes giving rise to the observed relic density in agreement with perturbative unitarity as well as observations of clusters of galaxies. This constitutes a novel production mechanism of MeV DM and an alternative to those relying on the Wess-Zumino-Witten term. Moreover, for specific meson mass spectra, similar resonant scatterings serve as a realization of velocity-dependent self-interacting DM without a light mediator. Explicit benchmark models are presented together with a discussion of possible signals, including gravitational waves from the chiral phase transition associated with the dark pions. |
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Address |
[Garcia-Cely, Camilo; Landini, Giacomo] Univ Valencia, Inst Fis Corpuscular IFIC, CSIC, Parc Cient UV,C Catedrat Jose Beltran 2, E-46980 Paterna, Spain |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
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Original Title |
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Series Title |
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Series Volume |
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Edition |
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ISSN |
2470-0010 |
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Notes |
WOS:001470488200015 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6621 |
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