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Primordial black holes and magnetic fields in conformal neutrino mass models

Balaji, Shyam ; Gonçalves, João LU ; Marfatia, Danny ; Morais, António P. LU and Pasechnik, Roman LU (2025) In Journal of Cosmology and Astroparticle Physics 2025(10).
Abstract

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 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 104GeV and 1011GeV 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... (More)

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 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 104GeV and 1011GeV 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 1011GeV can be correlated with Hawking evaporation signals at future gamma-ray telescopes. LISA can probe the entire range of PBH masses between 1 × 10-16 M⊙and 8 × 10-11 M⊙if PBHs fully account for the dark matter abundance. For Z'masses between 40 TeV and 104TeV, 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.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cosmological phase transitions, particle physics - cosmology connection, primordial black holes, primordial magnetic fields
in
Journal of Cosmology and Astroparticle Physics
volume
2025
issue
10
article number
064
publisher
IOP Publishing
external identifiers
  • scopus:105019782664
ISSN
1475-7516
DOI
10.1088/1475-7516/2025/10/064
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 IOP Publishing Ltd and Sissa Medialab. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
id
9f76c1f4-0d67-4ffd-8941-41327e18b195
date added to LUP
2025-12-18 08:12:14
date last changed
2025-12-18 08:12:55
@article{9f76c1f4-0d67-4ffd-8941-41327e18b195,
  abstract     = {{<p>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 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 10<sup>4</sup>GeV and 10<sup>11</sup>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<sup>11</sup>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<sup>-16</sup> M<sub>⊙</sub>and 8 × 10<sup>-11</sup> M<sub>⊙</sub>if PBHs fully account for the dark matter abundance. For Z'masses between 40 TeV and 10<sup>4</sup>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.</p>}},
  author       = {{Balaji, Shyam and Gonçalves, João and Marfatia, Danny and Morais, António P. and Pasechnik, Roman}},
  issn         = {{1475-7516}},
  keywords     = {{cosmological phase transitions; particle physics - cosmology connection; primordial black holes; primordial magnetic fields}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{10}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of Cosmology and Astroparticle Physics}},
  title        = {{Primordial black holes and magnetic fields in conformal neutrino mass models}},
  url          = {{http://dx.doi.org/10.1088/1475-7516/2025/10/064}},
  doi          = {{10.1088/1475-7516/2025/10/064}},
  volume       = {{2025}},
  year         = {{2025}},
}