Abstract
We propose that O(10 M_{⊙}) black holes observed by LIGO/Virgo originate from a first order phase transition at a temperature T_{*}≲100 MeV, associated with QCD^{'}-an early Universe deformation of the standard model QCD. This is realized by keeping the quark masses small compared to confinement scale down to T∼T_{*}, making QCD^{'} transition first order. We implement this scenario using a light scalar that could potentially be a good dark matter candidate.
Highlights
Direct observations of gravitational waves from mergers of compact stellar objects by the LIGO/Virgo collaborations mark the dawn of a new era in astronomy [1]
One of the early attempts soon after the first detection by LIGO was to consider whether the observed merger was of ∼30 M⊙ primordial black holes (PBHs) that constitute dark matter [5]
It is still worthwhile to inquire whether such a population of objects can be of primordial origin, though they may not be the main component of dark matter
Summary
We propose that Oð10 M⊙Þ black holes observed by LIGO/Virgo originate from a first order phase transition at a temperature TÃ ≲ 100 MeV, associated with QCD0—an early Universe deformation of the standard model QCD. This is realized by keeping the quark masses small compared to confinement scale down to T ∼ TÃ, making QCD0 transition first order. We entertain the possibility that the Oð10 M⊙Þ population of black holes points to a first order confining phase transition of QCD0—a modification of the SM QCD in the early Universe with the number of light quarks Nf 1⁄4 6 at the onset of the transition. If one arranges for the Higgs field to get a vacuum expectation value (VEV) after the confining transition, at
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
