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<p>Recent pulsar timing observations using MeerKAT of the eccentric binary millisecond pulsar, PSR J0514–4002E, have unveiled a companion with a mass in the mass gap, ranging from 2.09 <i>M</i><sub>⊙</sub> to 2.71 <i>M</i><sub>⊙</sub>. This challenges conventional astrophysical scenarios for black hole formation. In this paper, we present an alternative explanation: PSR J0514–4002E could be in a PBH-NS binary, with the companion potentially being a primordial black hole formed during the early Universe’s first-order phase transition. The associated stochastic gravitational-wave background generated during this phase transition can account for the observed signal from the pulsar timing array, and the abundance of primordial black holes is consistent with constraints from LIGO-Virgo-KAGRA.</p>

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Is PSR J0514–4002E in a PBH-NS binary?

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Zu-Cheng Chen,
  • Lang Liu

摘要

Recent pulsar timing observations using MeerKAT of the eccentric binary millisecond pulsar, PSR J0514–4002E, have unveiled a companion with a mass in the mass gap, ranging from 2.09 M⊙ to 2.71 M⊙. This challenges conventional astrophysical scenarios for black hole formation. In this paper, we present an alternative explanation: PSR J0514–4002E could be in a PBH-NS binary, with the companion potentially being a primordial black hole formed during the early Universe’s first-order phase transition. The associated stochastic gravitational-wave background generated during this phase transition can account for the observed signal from the pulsar timing array, and the abundance of primordial black holes is consistent with constraints from LIGO-Virgo-KAGRA.