Aurélien Barrau
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View article: Black holes in a dense infinite medium: A toy-model regularizing the Schwarzschild metric
Black holes in a dense infinite medium: A toy-model regularizing the Schwarzschild metric Open
In this paper, we revisit the dynamics of a black hole accreting energy from a surrounding homogeneous and infinite space. We argue for a simple heuristic modification of the Schwarzschild approximation when the density of the medium is no…
View article: Anomaly freedom in effective loop quantum cosmology refined: Extended functional dependence of the counterterms
Anomaly freedom in effective loop quantum cosmology refined: Extended functional dependence of the counterterms Open
International audience
View article: Gravitational Waves sourced by Gauge Fields during Inflation
Gravitational Waves sourced by Gauge Fields during Inflation Open
We study the inflationary gravitational wave background induced by Abelian gauge fields generated by non-minimal kinetic and axial couplings to the inflaton. We show that the gravitational wave spectrum is scale invariant and derive its am…
View article: Stochastic background of gravitational waves from cosmic-rays
Stochastic background of gravitational waves from cosmic-rays Open
Cosmic-rays are charged particles moving in magnetic fields. They not only emit well-known synchrotron photons but also gravitational radiation. We clarify the characteristics of the gravitational wave signal in this specific situation and…
View article: Emission and detection of ultrahigh frequency gravitational waves from highly eccentric orbits of compact binary systems
Emission and detection of ultrahigh frequency gravitational waves from highly eccentric orbits of compact binary systems Open
International audience
View article: Elementary considerations on possible entropy-driven cosmological evolutions
Elementary considerations on possible entropy-driven cosmological evolutions Open
For several independent reasons, the idea that notorious sources of entropy could exist in the Universe has been recently revived. By taking advantage of a new framework accounting for nonequilibrium processes in cosmology, we explicitly i…
View article: Prospects for detection of ultra high frequency gravitational waves from compact binary coalescences with resonant cavities
Prospects for detection of ultra high frequency gravitational waves from compact binary coalescences with resonant cavities Open
This article aims at clarifying the situation about astrophysical sources that might be observed with haloscope experiments sensitive to gravitational waves in the 1–10 GHz band. The GrAHal setup is taken as a benchmark. We follow a very p…
View article: Prospects for detection of ultrahigh frequency gravitational waves from hyperbolic encounters with resonant cavities
Prospects for detection of ultrahigh frequency gravitational waves from hyperbolic encounters with resonant cavities Open
In this brief article, we pursue the systematic investigation of possible gravitational wave sources in the gigahertz band. We focus on hyperbolic encounters of light black holes and evaluate precisely the expected signal when accounting f…
View article: Anomaly freedom in effective loop quantum cosmology: Pedagogical summary and generalized holonomy corrections
Anomaly freedom in effective loop quantum cosmology: Pedagogical summary and generalized holonomy corrections Open
The issue of consistency is crucial in quantum gravity. It has recently been intensively addressed for effective symmetry-reduced models. In this article, we exhaustively study the anomaly freedom of effective loop quantum cosmology with g…
View article: Gravitational waves from high-power twisted light
Gravitational waves from high-power twisted light Open
Recent advances in high-energy and high-peak-power laser systems have opened up new possibilities for fundamental physics research. In this work, the potential of twisted light for the generation of gravitational waves in the high frequenc…
View article: LSST camera verification testing and characterization
LSST camera verification testing and characterization Open
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
View article: Boosting gravitational waves: a review of kinematic effects on amplitude, polarization, frequency and energy density
Boosting gravitational waves: a review of kinematic effects on amplitude, polarization, frequency and energy density Open
We review the kinematic effects on a gravitational wave due to either a peculiar motion of the astrophysical source emitting it or a local motion of the observer. Working in the context of general relativity, we show at fully non-linear or…
View article: Einstein vs Hawking: black hole binaries and cosmological expansion
Einstein vs Hawking: black hole binaries and cosmological expansion Open
This note aims at investigating two different situations where the classical general relativistic dynamics compete with the evolution driven by Hawking evaporation. We focus, in particular, on binary systems of black holes emitting gravita…
View article: Gravitational waves from high-power twisted light
Gravitational waves from high-power twisted light Open
Recent advances in high-energy and high-peak-power laser systems have opened up new possibilities for fundamental physics research. In this work, the potential of twisted light for the generation of gravitational waves in the high frequenc…
View article: Einstein vs Hawking: Black hole binaries and cosmological expansion
Einstein vs Hawking: Black hole binaries and cosmological expansion Open
This note aims at investigating two different situations where the classical general relativistic dynamics competes with the evolution driven by Hawking evaporation. We focus, in particular, on binary systems of black holes emitting gravit…
View article: Competitive effects between gravitational radiation and mass variation for two-body systems in circular orbits
Competitive effects between gravitational radiation and mass variation for two-body systems in circular orbits Open
This work provides, at lower order, general analytical solutions for the orbital separation, merging time, and orbital frequency of binary systems emitting gravitational waves while being submitted to mass variations. Specific features, de…
View article: Competitive effects between gravitational radiation and mass variation for two-body systems in circular orbits
Competitive effects between gravitational radiation and mass variation for two-body systems in circular orbits Open
This work provides, at lower order, general analytical solutions for the orbital separation, merging time, and orbital frequency of binary systems emitting gravitational waves while being submitted to mass variations. Specific features, de…
View article: High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station
High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station Open
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previo…
View article: Prospects for detection of ultra high frequency gravitational waves from compact binary coalescenses with resonant cavities
Prospects for detection of ultra high frequency gravitational waves from compact binary coalescenses with resonant cavities Open
This article aims at clarifying the situation about astrophysical sources that might be observed with haloscope experiments sensitive to gravitational waves in the 1-10 GHz band. The GrAHal setup is taken as a benchmark. We follow a very p…
View article: Impact of generalized holonomy corrections on the cosmological primordial power spectra
Impact of generalized holonomy corrections on the cosmological primordial power spectra Open
The propagation of perturbations is studied with generalized holonomy corrections in a fully consistent way, ensuring that the deformed algebra of constraints remains closed. The primordial cosmological power spectra are calculated. It is …
View article: Catastrophic fate of Schwarzschild black holes in a thermal bath
Catastrophic fate of Schwarzschild black holes in a thermal bath Open
Using the Schwarzschild metric as a rudimentary toy model, we pedagogically\nrevisit the curious prediction that the mass of a classical black hole in a\nconstant temperature thermal bath diverges in a finite amount of time. We study\nin d…
View article: Detailed analysis of the curvature bounce: background dynamics and imprints in the CMB
Detailed analysis of the curvature bounce: background dynamics and imprints in the CMB Open
If the spatial sections of the Universe are positively curved, extrapolating the inflationary stage backward in time inevitably leads to a classical bounce. This simple scenario, non-singular and free of exotic physics, deserves to be inve…
View article: The holographic space-time and black hole remnants as dark matter
The holographic space-time and black hole remnants as dark matter Open
The holographic space-time approach to inflation provides a well defined and\nself-contained framework to study the early universe. Based on a quasi-local\nquantum gravity theory generalizing string theory beyond AdS backgrounds, it\naddre…
View article: Catastrophic fate of Schwarzschild black holes in a thermal bath
Catastrophic fate of Schwarzschild black holes in a thermal bath Open
Using the Schwarzschild metric as a rudimentary toy model, we pedagogically revisit the curious prediction that the mass of a classical black hole in a constant temperature thermal bath diverges in a finite amount of time. We study in deta…
View article: Cosmological implications of generalized holonomy corrections
Cosmological implications of generalized holonomy corrections Open
Most of the phenomenology of loop quantum gravity in the cosmological sector\nis based on the so-called holonomy correction to the Hamiltonian constraint. It\nstraightforwardly modifies the Friedmann equations. In this work, we\ninvestigat…
View article: Cosmological implications of generalized holonomy corrections
Cosmological implications of generalized holonomy corrections Open
Most of the phenomenology of loop quantum gravity in the cosmological sector is based on the so-called holonomy correction to the Hamiltonian constraint. It straightforwardly modifies the Friedmann equations. In this work, we investigate t…