Probing Ultra-light Primordial Black Holes as a Dark Matter Candidate Anupam Ray
2025-05-02
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Probing Ultra-light Primordial Black Holes as a
Dark Matter Candidate
Anupam Ray
Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India
anupam.ray@theory.tifr.res.in
Abstract. Dark Matter (DM) is omnipresent in our universe. Despite
its abundance, the microscopic identity of DM still remains a mystery.
Primordial black holes (PBHs), possibly formed via gravitational collapse
of large density perturbations in the early universe, are one of the earliest
proposed and viable DM candidates. Recent studies indicate that PBHs
can make up a large or even entire fraction of the DM density for a wide
range of masses. Here, we briefly review the observational constraints
on PBHs as DM, concentrating on the ultra-light mass window. Ultra-
light PBHs emit particles via Hawking radiation and can be probed by
observing such Hawking evaporated particles in various space as well as
ground based detectors. We also outline how next-generation gamma ray
telescopes can set a stringent exclusion limit on ultra-light PBH DM by
probing low energy photons.
Keywords: Primordial Black Holes, Hawking Radiation, Dark Matter
1 Introduction
Cosmological observations provide unambiguous evidence of a non-relativistic,
collision-less, and weakly interacting non-baryonic matter, commonly known as
dark matter (DM), as a dominant component of the Universe [1]. Many well-
motivated DM candidates have been proposed, and decades of experimental
searches have been conducted to hunt for these mysterious DM particles, yet the
microscopic identity remains unknown. Primordial black holes (PBHs), possibly
formed via gravitational collapse of large overdensities in the very early universe
are one of the earliest proposed and viable DM candidates [2,3,4].
PBHs have a wide range of masses depending on their time of formation, and
can constitute a large or even entire fraction of the present day DM density in
the mass range of ∼1017 −1023 g. The idea of PBHs as DM has recently received
a renewed attention with the detection of a BH merger by the LIGO-Virgo col-
laboration and the subsequent proposals that the BH merger can be primordial
in origin [5,6,7]. Several techniques have been implemented in order to probe
the PBH fraction of DM, yields a multitude of observational constraints [8,9,10].
Here, we briefly review the current status of PBHs as DM, mostly concentrating
on the ultra-light mass window.
arXiv:2210.00072v2 [hep-ph] 10 Oct 2022
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ProbingUltra-lightPrimordialBlackHolesasaDarkMatterCandidateAnupamRayTataInstituteofFundamentalResearch,HomiBhabhaRoad,Mumbai,400005,Indiaanupam.ray@theory.tifr.res.inAbstract.DarkMatter(DM)isomnipresentinouruniverse.Despiteitsabundance,themicroscopicidentityofDMstillremainsamystery.Primordialblackh...
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价格：10玖币
属性：4 页
大小：348.18KB
格式：PDF
时间：2025-05-02
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