191 citations · 485 across the 19 of their papers we have counts for
19 papers
Primordial Asymmetries, Primordial Equation of State & Primordial Black Holes
Maël Gonin, Julien Froustey, Albert Escrivà +3
We study the thermal history of the primordial Universe in the presence of non-zero lepton and baryon asymmetries. Considering different scenarios, we determine the equation of sta…
Gravitational Imprints of Axion Clouds on Black-Hole Orbital Dynamics
J. Ruz, V. Mungai, F. Kühnel +4
Black holes of primordial or astrophysical origin immersed in axion dark matter provide a natural laboratory for exploring the interplay between compact objects and ultralight scal…
Parameter Estimation on LIGO-Virgo-KAGRA O4a Binary Merger Triggers with Sub-solar Mass Components
Nelson Christensen, Neil Cornish, Florian Kühnel +2
The LIGO-Virgo-KAGRA collaboration has reported the results for searches for sub-solar mass components in compact binary coalescence during observing run O4a. No detection candidat…
Observing Micro Black Hole Dark Matter
Manuel Ettengruber, Florian Kühnel
Primordial micro black holes can constitute dark matter if short-distance gravity is modified by extra dimensions or a large number of species and if the memory-burden effect suffi…
Revisiting Primordial Black Hole Capture by Neutron Stars
Roberto Caiozzo, Gianfranco Bertone, Florian Kühnel
A sub-solar mass primordial black hole (PBH) passing through a neutron star, can lose enough energy through interactions with the dense stellar medium to become gravitationally bou…
Reconstructing Primordial Black Hole Power Spectra from Gravitational Waves
Daniel Frolovsky, Florian Kuhnel, Ioanna Stamou
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…
Solar evolution models with a central black hole
Earl P. Bellinger, Matt E. Caplan, Taeho Ryu +6
Hawking (1971) proposed that the Sun may harbor a primordial black hole whose accretion supplies some of the solar luminosity. Such an object would have formed within the first 1 s…
Vortex Effects in Merging Black Holes and Saturons
Gia Dvali, Oleg Kaikov, Florian Kuhnel +2
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 o…
Vortices in Black Holes
Gia Dvali, Florian Kuhnel, Michael Zantedeschi
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 gen…
Primordial Black Holes as Dark Matter Candidates
Bernard Carr, Florian Kuhnel
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…
Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
Sofiane M. Boucenna, Florian Kuhnel, Tommy Ohlsson +1
We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a d…
On Ellipsoidal Collapse and Primordial Black-Hole Formation
Florian Kuhnel, Marit Sandstad
We reinvestigate gravitational ellipsoidal collapse with special focus on its impact on primordial black-hole formation. For a generic model we demonstrate that the abundance and e…
Effects of Critical Collapse on Primordial Black-Hole Mass Spectra
Florian Kuhnel, Cornelius Rampf, Marit Sandstad
Certain inflationary models as well as realisations of phase transitions in the early Universe predict the formation of primordial black holes. For most mass ranges, the fraction o…
Corpuscular Consideration of Eternal Inflation
Florian Kuhnel, Marit Sandstad
We review the paradigm of eternal inflation in the light of the recently proposed corpuscular picture of space-time. Comparing the strength of the average fluctuation of the field…
Consistent Cosmic Microwave Background Spectra from Quantum Depletion
Roberto Casadio, Florian Kuhnel, Alessio Orlandi
Following a new quantum cosmological model proposed by Dvali and Gomez, we quantitatively investigate possible modifications to the Hubble parameter and following corrections to th…
High-Energy Gravitational Scattering and Bose-Einstein Condensates of Gravitons
Florian Kuhnel, Bo Sundborg
Quantum black holes are difficult to describe. We consider two seemingly divergent approaches, high-energy scattering and the proposal to regard black holes as Bose-Einstein conden…
Island of Stability for Consistent Deformations of Einstein's Gravity
Felix Berkhahn, Dennis Dietrich, Stefan Hofmann +2
We construct explicitly deformations of Einstein's theory of gravity that are consistent and phenomenologically viable since they respect, in particular, cosmological backgrounds.…
Large-Scale Suppression from Stochastic Inflation
Florian Kuhnel, Dominik J. Schwarz
We show non-perturbatively that the power spectrum of a self-interacting scalar field in de Sitter space-time is strongly suppressed on large scales. The cut-off scale depends on t…
Stochastic Inflation and Replica Field Theory
Florian Kuhnel, Dominik J. Schwarz
We adopt methods from statistical field theory to stochastic inflation. For the example of a free test field in de Sitter and power-law inflation, the power spectrum of long-wavele…