Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Kuhnel, Florian"'
Autor:
Kuhnel, Florian, Stamou, Ioanna
A novel methodology for analysing the relation between the energy density in gravitational waves and primordial power spectra is developed. Focusing on scalar-induced gravitational radiation, this methodology is applied to a number of scenarios for t
Externí odkaz:
http://arxiv.org/abs/2404.06547
Autor:
Dvali, Gia, Kaikov, Oleg, Kuhnel, Florian, Valbuena-Bermúdez, Juan Sebastián, Zantedeschi, Michael
Vorticity has recently been suggested to be a property of highly-spinning black holes. The connection between vorticity and limiting spin represents a universal feature shared by objects of maximal microstate entropy, so-called saturons. Using $Q$-ba
Externí odkaz:
http://arxiv.org/abs/2310.02288
Publikováno v:
Physics Reports 1054 (2024) 1
We review numerous arguments for primordial black holes (PBHs) based on observational evidence from a variety of lensing, dynamical, accretion and gravitational-wave effects. This represents a shift from the usual emphasis on PBH constraints and prov
Externí odkaz:
http://arxiv.org/abs/2306.03903
Publikováno v:
Chapter 4 - Primordial black holes, Editor(s): Manuel Arca Sedda, Elisa Bortolas, Mario Spera, Black Holes in the Era of Gravitational-Wave Astronomy, Elsevier, 2024, Pages 261-377
Aspects of primordial black holes, i.e. black holes formed in the early Universe, are reviewed. Special emphasis is put on their formation, their r{\^o}le as dark matter candidates and their manifold signatures, particularly through gravitational wav
Externí odkaz:
http://arxiv.org/abs/2211.05767
Publikováno v:
Phys. Rev. Lett. 129, 061302 (2022)
We argue that black holes admit vortex structure. This is based both on a graviton-condensate description of a black hole as well as on a correspondence between black holes and generic objects with maximal entropy compatible with unitarity, so-called
Externí odkaz:
http://arxiv.org/abs/2112.08354
Autor:
Carr, Bernard, Kuhnel, Florian
Publikováno v:
SciPost Phys. Lect. Notes 48 (2022)
We review the formation and evaporation of primordial black holes (PBHs) and their possible contribution to dark matter. Various constraints suggest they could only provide most of it in the mass windows $10^{17}$ - $10^{23}\,$g or $10$ - $10^{2}\,M_
Externí odkaz:
http://arxiv.org/abs/2110.02821
Publikováno v:
Phys. Rev. D 104 (2021) 123507
A mechanism for the formation of primordial black holes is proposed. Here, heavy quarks of a confining gauge theory produced by de Sitter fluctuations are pushed apart by inflation and get confined after horizon re-entry. The large amount of energy s
Externí odkaz:
http://arxiv.org/abs/2108.09471
Autor:
Kuhnel, Florian, Schwarz, Dominik J.
We argue that primordial black-hole formation must be described by means of extreme-value theory. This is a consequence of the large values of the energy density required to initiate the collapse of black holes in the early Universe and the finite du
Externí odkaz:
http://arxiv.org/abs/2101.10340
Publikováno v:
Phys. Rev. D 103, 063506 (2021)
We study the influence of lepton flavour asymmetries on the formation and the mass spectrum of primordial black holes. We estimate the detectability of their mergers with LIGO/Virgo and show that the currently published gravitational wave events may
Externí odkaz:
http://arxiv.org/abs/2011.07283
Publikováno v:
Mon. Not. Roy. Astron. Soc. 506 3, 3648-3661 (2021)
We consider constraints on primordial black holes (PBHs) in the mass range $( 10^{-18}\text{-}10^{15} )\,M_{\odot}$ if the dark matter (DM) comprises weakly interacting massive particles (WIMPs) which form halos around them and generate $\gamma$-rays
Externí odkaz:
http://arxiv.org/abs/2011.01930