The Interplay between the Dark Matter Axion and Primordial Black Holes

Mazde, Kratika; Visinelli, Luca

doi:10.48550/arxiv.2209.14307

Cited by 2 publications

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“…[36] suggests a heavier axion mass window, m a ∼O(0.2-80) meV, with the discrepancy that can be traced back on different results of the scaling of the spectral index [37]. The allowed window of QCD axion mass comprising all of the DM abundance significantly alters on invoking non-standard cosmology [38][39][40][41][42][43][44] or during an era of primordial black hole domination [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

QCD Axion Kinetic Misalignment without Prejudice

et al. 2022

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The axion field, the angular direction of the complex scalar field associated with the spontaneous symmetry breaking of the Peccei–Quinn (PQ) symmetry, could have originated with initial non-zero velocity. The presence of a non-zero angular velocity resulting from additional terms in the potential that explicitly break the PQ symmetry has important phenomenological consequences such as a modification of the axion mass with respect to the conventional PQ framework or an explanation for the observed matter-antimatter asymmetry. We elaborate further on the consequences of the “kinetic misalignment” mechanism, assuming that axions form the entirety of the dark matter abundance. The kinetic misalignment mechanism possesses a weak limit in which the axion field starts to oscillate at the same temperature as in the conventional PQ framework, and a strong limit corresponding to large initial velocities which effectively delay the onset of oscillations. Following a UV-agnostic approach, we show how this scenario impacts the formation of axion miniclusters, and we sketch the details of these substructures along with potential detecting signatures.

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Section: Introductionmentioning

confidence: 99%

QCD Axion Kinetic Misalignment without Prejudice

et al. 2022

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“…The evaporating PBHs can directly produce all the particles within and beyond the Standard Model (SM), for example, gravitons [14] and supersymmetric particles, even when their masses are much larger than the temperature of the Universe. It is also shown that the Hawking radiation can be responsible for the generation of baryon asymmetry [15][16][17][18][19][20][21] and have impacts on the axion dark matter models [22][23][24]. A small PBH might induce the Higgs vacuum decay as well [25][26][27][28][29][30][31][32], where its physical interpretation and the validity of the calculation are still under debate [33][34][35][36][37][38].…”

Section: Jcap01(2023)027mentioning

confidence: 99%

Formation of hot spots around small primordial black holes

Kohri

Mukaida

et al. 2023

J. Cosmol. Astropart. Phys.

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In this paper, we investigate the thermalization of Hawking radiation from primordial black holes (PBHs) in the early Universe, taking into account the interference effect on thermalization of high energy particles, known as Landau-Pomeranchuk-Migdal (LPM) effect. Small PBHs with masses ≲ 109 g completely evaporate before the big bang nucleosynthesis (BBN). The Hawking radiation emitted from these PBHs heats up the ambient plasma with temperature lower than the Hawking temperature, which results in a non-trivial temperature profile around the PBHs, namely a hot spot surrounding a PBH with a broken power-law tail. We find that the hot spot has a core with a radius much larger than the black hole horizon and its highest temperature is independent of the initial mass of the PBH such as 2 × 109 GeV × (α/0.1)19/3, where α generically represents the fine-structure constants. We also briefly discuss the implications of the existence of the hot spot for phenomenology.

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The Interplay between the Dark Matter Axion and Primordial Black Holes

Cited by 2 publications

References 0 publications

QCD Axion Kinetic Misalignment without Prejudice

QCD Axion Kinetic Misalignment without Prejudice

Formation of hot spots around small primordial black holes

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