Results 11 to 20 of about 38,428 (135)

Were recently reported MHz events planet mass primordial black hole mergers?

European Physical Journal C: Particles and Fields, 2021
A bulk acoustic wave cavity as high frequency gravitational wave antenna has recently detected two rare events at 5.5MHz. Assuming that the detected events are due to gravitational waves, their characteristic strain amplitude lies at about $$h_c\approx 2.
Guillem Domènech
doaj   +1 more source

Observational Imprints of Enhanced Scalar Power on Small Scales in Ultra Slow Roll Inflation and Associated Non-Gaussianities

Galaxies, 2023
The discovery of gravitational waves from merging binary black holes has generated considerable interest in examining whether these black holes could have a primordial origin.
H. V. Ragavendra, L. Sriramkumar
doaj   +1 more source

Production of Primordial Black Holes in Improved E-Models of Inflation

Universe, 2023
E-type α-attractor models of single-field inflation were generalized further in order to accommodate production of primordial black holes (PBHs) via adding a near-inflection point to the inflaton scalar potential at smaller scales, in good agreement with
Daniel Frolovsky, Sergei V. Ketov
doaj   +1 more source

Implications of primordial black holes on the first stars and the origin of the super--massive black holes [PDF]

, 2009
If the cosmological dark matter has a component made of small primordial black holes, they may have a significant impact on the physics of the first stars and on the subsequent formation of massive black holes.
Abel, Abramowicz, Alcock, Alexander D. Dolgov, Bambi, Barkana, Begelman, Begelman, Binney, Bisnovatyi-Kogan, Bondi, Bromm, Bromm, Carr, Carr, Carr, Ciotti, Cosimo Bambi, Crawford, Dolgov, Douglas Spolyar, Freese, Freese, Gould, Haiman, Hawke, Hawking, Hawking, Hawking, Hawking, Heger, Hollenbach, Jedamzik, Katherine Freese, Li, MacFadyen, Marani, Marta Volonteri, Matsuda, McKee, Navarro, Nemiroff, Novikov, Omukai, Page, Page, Peebles, Pelupessy, Polnarev, Rubin, Sellwood, Seto, Shapiro, Silk, Spolyar, Springel, Tegmark, Tisserand, Volonteri, Volonteri, Yoshida, Yoshida, Zeldovich   +62 more
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Clusters of Primordial Black Holes

European Physical Journal C: Particles and Fields, 2019
The Primordial Black Holes (PBHs) are a well-established probe for new physics in the very early Universe. We discuss here the possibility of PBH agglomeration into clusters that may have several prominent observable features.
Konstantin M. Belotsky, Vyacheslav I. Dokuchaev, Yury N. Eroshenko, Ekaterina A. Esipova, Maxim Yu. Khlopov, Leonid A. Khromykh, Alexander A. Kirillov, Valeriy V. Nikulin, Sergey G. Rubin, Igor V. Svadkovsky   +9 more
doaj   +1 more source

Towards a reliable reconstruction of the power spectrum of primordial curvature perturbation on small scales from GWTC-3

Physics Letters B, 2023
Primordial black holes (PBHs) can be both candidates of dark matter and progenitors of binary black holes (BBHs) detected by the LIGO-Virgo-KAGRA collaboration.
Li-Ming Zheng, Zhengxiang Li, Zu-Cheng Chen, Huan Zhou, Zong-Hong Zhu   +4 more
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Primordial black holes from modified supergravity

European Physical Journal C: Particles and Fields, 2020
The modified supergravity approach is applied to describe a formation of Primordial Black Holes (PBHs) after Starobinsky inflation. Our approach naturally leads to the two-(scalar)-field attractor-type double inflation, whose first stage is driven by ...
Yermek Aldabergenov, Andrea Addazi, Sergei V. Ketov   +2 more
doaj   +1 more source

The formation probability of primordial black holes

Physics Letters B, 2021
We calculate the formation probability of primordial black holes generated during the collapse at horizon re-entry of large fluctuations produced during inflation, such as those ascribed to a period of ultra-slow-roll.
Matteo Biagetti, Valerio De Luca, Gabriele Franciolini, Alex Kehagias, Antonio Riotto   +4 more
doaj   +1 more source

Primordial Black Holes in Phantom Cosmology [PDF]

, 2009
We investigate the effects of accretion of phantom energy onto primordial black holes. Since Hawking radiation and phantom energy accretion contribute to a {\it decrease} of the mass of the black hole, the primordial black hole that would be expected to ...
Jamil, Mubasher, Qadir, Asghar
core   +3 more sources

The dark universe: Primordial black hole ⇋ dark graviton gas connection

Physics Letters B, 2023
We study the possible correspondence between 5-dimensional primordial black holes and massive 5-dimensional KK gravitons as dark matter candidate within the recently proposed dark dimension scenario that addresses the cosmological hierarchy problem ...
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
doaj   +1 more source