Associate Professor
Supervisor of Master's Candidates
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DOI number:10.1103/PhysRevD.102.075028
Journal:Physical Review D
Abstract:We propose a novel dark matter (DM) scenario based on a first-order phase transition in the early Universe. If dark fermions acquire a huge mass gap between true and false vacua, they can barely penetrate into the new phase. Instead, they get trapped in the old phase and accumulate to form macroscopic objects, dubbed Fermi-balls. We show that Fermi-balls can explain the DM abundance in a wide range of models and parameter space, depending most crucially on the dark-fermion asymmetry and the phase transition energy scale (possible up to the Planck scale). They are stable by the balance between fermion’s quantum pressure against free energy release, hence turn out to be macroscopic in mass and size. However, this scenario generally produces no detectable signals (which may explain the null results of DM searches), except for detectable gravitational waves for electroweak scale phase transitions; although the detection of such stochastic gravitational waves does not necessarily imply a Fermi-ball DM scenario.
Indexed by:Journal paper
First-Level Discipline:Physics
Document Type:J
Volume:102
Issue:075028
Translation or Not:no
Date of Publication:2020-10-23
Included Journals:SCI
Links to published journals:https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.075028
