Primordial black holes and magnetic fields in conformal neutrino mass models

Balaji, Shyam; Gonçalves, João; Marfatia, Danny; Morais, António P.; Pasechnik, Roman

doi:10.1088/1475-7516/2025/10/064

Primordial black holes and magnetic fields in conformal neutrino mass models

Journal Article · Wed Oct 15 00:00:00 EDT 2025 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2025/10/064· OSTI ID:3008344

^[1]; ^[2]; Marfatia, Danny ^[3]; ^[4]; ^[5]

King's College, London (United Kingdom)
Univ. of Aveiro (Portugal); University of Minho (Portugal)
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Univ. of Minho (Portugal); University of Aveiro (Portugal)
Lund Univ. (Sweden)

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. Here, we study these mechanisms in a generic class of conformal U(1)' 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 10⁴ GeV and 10¹¹ 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 10¹¹ GeV can be correlated with Hawking evaporation signals at future gamma-ray telescopes. LISA can probe the entire range of PBH masses between 1 × 10^-16M_⊙ and 8 × 10^-11M_⊙ if PBHs fully account for the dark matter abundance. For Z' masses between 40 TeV and 10⁴ TeV, and 10 TeV right-handed neutrinos, helical magnetic fields can be produced with magnitudes ≳ 0.5 pG and coherence lengths ≳ 0.008 Mpc, above current blazar lower bounds.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0010504

OSTI ID:: 3008344

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 10 Vol. 2025; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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