Primordial black holes and magnetic fields in conformal neutrino mass models
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| Format: | Preprint |
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2025
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| _version_ | 1866911682309128192 |
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| author | Balaji, Shyam Gonçalves, João Marfatia, Danny Morais, António P. Pasechnik, Roman |
| author_facet | Balaji, Shyam Gonçalves, João Marfatia, Danny Morais, António P. Pasechnik, Roman |
| contents | Sufficiently strong and long-lasting first-order phase transitions can produce primordial black holes (PBHs) that contribute substantially to the dark matter abundance of the Universe, and can produce large-scale primordial magnetic fields. We study these mechanisms in a generic class of conformal $\mathrm{U(1)}^\prime$ models that also explain active neutrino oscillation data via the type-I seesaw mechanism. We find that phase transitions that occur at seesaw scales between $10^4$ GeV and $10^{11}$ GeV produce gravitational wave signals (from the dynamics of the phase transition and from the decay of cosmic string loops) at LISA/ET that can be correlated with microlensing signals of PBHs at the Roman Space Telescope, while scales near $10^{11}$ GeV can be correlated with Hawking evaporation signals at future gamma-ray telescopes. LISA can probe the entire range of PBH masses between $1\times 10^{-16}M_\odot$ and $8\times 10^{-11}M_\odot$ if PBHs fully account for the dark matter abundance. For Z' masses between 5 TeV and 100 TeV, and $\sim 3$ TeV right-handed neutrinos, helical magnetic fields can be produced with magnitudes $\sim 10^{-16}$-$10^{-13}$ G and coherence lengths $\sim 10^{-4}$-$10^{-2}$ Mpc, above current blazar lower bounds. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_08011 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Primordial black holes and magnetic fields in conformal neutrino mass models Balaji, Shyam Gonçalves, João Marfatia, Danny Morais, António P. Pasechnik, Roman High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Sufficiently strong and long-lasting first-order phase transitions can produce primordial black holes (PBHs) that contribute substantially to the dark matter abundance of the Universe, and can produce large-scale primordial magnetic fields. We study these mechanisms in a generic class of conformal $\mathrm{U(1)}^\prime$ models that also explain active neutrino oscillation data via the type-I seesaw mechanism. We find that phase transitions that occur at seesaw scales between $10^4$ GeV and $10^{11}$ GeV produce gravitational wave signals (from the dynamics of the phase transition and from the decay of cosmic string loops) at LISA/ET that can be correlated with microlensing signals of PBHs at the Roman Space Telescope, while scales near $10^{11}$ GeV can be correlated with Hawking evaporation signals at future gamma-ray telescopes. LISA can probe the entire range of PBH masses between $1\times 10^{-16}M_\odot$ and $8\times 10^{-11}M_\odot$ if PBHs fully account for the dark matter abundance. For Z' masses between 5 TeV and 100 TeV, and $\sim 3$ TeV right-handed neutrinos, helical magnetic fields can be produced with magnitudes $\sim 10^{-16}$-$10^{-13}$ G and coherence lengths $\sim 10^{-4}$-$10^{-2}$ Mpc, above current blazar lower bounds. |
| title | Primordial black holes and magnetic fields in conformal neutrino mass models |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2505.08011 |