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HONG, Jeone Pyong
순수물리이론 연구단
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Fermi-ball dark matter from a first-order phase transition

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Title
Fermi-ball dark matter from a first-order phase transition
Author(s)
Jeong-Pyong Hong; Sunghoon Jung; Ke-Pan Xie
Subject
BUBBLE NUCLEATION, ; LEPTOGENESIS, ; SPACE, ; BARYOGENESIS, ; INFLATION, ; SEARCHES, ; PROGRAM, ; VACUUM
Publication Date
2020-10
Journal
PHYSICAL REVIEW D, v.102, no.7, pp.075028
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 authors. Published by the American Physical Society. 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.
URI
https://pr.ibs.re.kr/handle/8788114/7580
DOI
10.1103/PhysRevD.102.075028
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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