Aurélien Barrau

Laboratoire de Physique Subatomique et de Cosmologie

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Co-Authors

L. Derome

Université Grenoble Alpes

A. Menchaca-Rocha

Universidad Nacional Autónoma de México

Killian Martineau

Laboratoire de Physique Subatomique et de Cosmologie

Julien Grain

Institut d'Astrophysique Spatiale

E. S. Seo

University of Maryland, College Park

M. Buénerd

Laboratoire de Physique Subatomique et de Cosmologie

J. Casaus

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

C. Mañá

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

J. Marín

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

J. Berdugo

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Cooperative Institutions

Centre National de la Recherche Scientifique

235

Institut National de Physique Nucléaire et de Physique des Particules

149

Massachusetts Institute of Technology

143

Chinese Academy of Sciences

131

European Organization for Nuclear Research

118

Institute of High Energy Physics

111

RWTH Aachen University

Université Grenoble Alpes

SLAC National Accelerator Laboratory

Laboratoire de Physique Subatomique et de Cosmologie

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Proton Flux PhysRevLett.114.171103

M. Aguilar D. Aisa B. Alpat A. Alvino G. Ambrosi

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Gravitation: introduction to general relativity and its extensions

Aurélien Barrau

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Black hole solutions in the N > 4 gravity models with higher order curvature corrections and possibilities for experimental search of such objects

Journal of Physics Conference Series (2006)

S. O. Alexeyev N. N. Popov Aurélien Barrau Julien Grain

The Gauss - Bonnet invariant is one of the most promising candidates for a quadratic curvature correction to the Einstein action in expansions of supersymmetric string theory. We study these Gauss - Bonnet black holes (and their properties) which could be formed at future colliders if the Planck scale is of order a TeV, as predicted by some modern brane world models.

Gauss–Bonnet theorem

Black hole (networking)

10.1088/1742-6596/33/1/041

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Citations (3)

Les enjeux de l'astrophysique gamma à très haute énergie.

Journal des Astronomes Francais (1998)

Aurélien Barrau Anne Renault

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A first step towards the inflationary trans-Planckian problem treatment in loop quantum cosmology

International Journal of Modern Physics D (2018)

Killian Martineau Aurélien Barrau Julien Grain

For most initial conditions, cosmologically relevant physical modes were trans-planckian at the bounce time, often by many magnitude orders. We improve the usual loop quantum cosmology calculation of the primordial power spectra -- in the inflationary framework -- by accounting for those trans-planckian effects through modified dispersion relations. This can induce drastic changes in the spectrum, making it either compatible or incompatible with observational data, depending on the details of the choices operated.

Loop Quantum Cosmology

10.1142/s0218271818500670

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Citations (16)

Semiclassical scalar propagators in curved backgrounds: Formalism and ambiguities

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2007)

Julien Grain Aurélien Barrau

The phenomenology of quantum systems in curved space-times is among the most fascinating fields of physics, allowing---often at the gedankenexperiment level---constraints on tentative theories of quantum gravity. Determining the dynamics of fields in curved backgrounds remains, however, a complicated task because of the highly intricate partial differential equations involved, especially when the space metric exhibits no symmetry. In this article, we provide---in a pedagogical way---a general formalism to determine this dynamics at the semiclassical order. To this purpose, a generic expression for the semiclassical propagator is computed and the equation of motion for the probability four-current is derived. Those results underline a direct analogy between the computation of the propagator in general relativistic quantum mechanics and the computation of the propagator for stationary systems in nonrelativistic quantum mechanics. A possible application of this formalism to curvature-induced quantum interferences is also discussed.

Propagator

Semiclassical physics

Curved space

10.1103/physrevd.76.084009

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Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station

Physical Review Letters (2018)

M. Aguilar L. Ali Cavasonza G. Ambrosi L. Arruda N. Attig

We present high-statistics, precision measurements of the detailed time and energy dependence of the primary cosmic-ray electron flux and positron flux over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. Based on 23.5×10^{6} events, we report the observation of short-term structures on the timescale of months coincident in both the electron flux and the positron flux. These structures are not visible in the e^{+}/e^{-} flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over 830±30 days from one value to another. The midpoint of the transition shows an energy dependent delay relative to the reversal and changes by 260±30 days from 1 to 6 GeV.

Space Weather

10.1103/physrevlett.121.051102

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Citations (86)

Le bien-être animal: un enjeu crucial pour la pisciculture

HAL (Le Centre pour la Communication Scientifique Directe) (2020)

Astrid Guillaume Aurélien Barrau Allain Bougrain Dubourg Dalila Bovet Florence Burgat

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Prototype study of a Proximity Focusing RICH for the AMS experiment

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2000)

T. Thuillier F. Malek J. Ballon D. Barancourt G. Barbier

10.1016/s0168-9002(99)01202-4

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Citations (6)

Flux of light antimatter nuclei near Earth

AIP conference proceedings (2006)

B. Baret Aurélien Barrau G. Boudoul M. Buénerd L. Derome

The fluxes of light antinuclei A⩽ 4 induced near earth by Cosmic Ray (CR) interactions with the interstellar matter (ISM) in the Galaxy are calculated in a phenomenological framework. The hadronic production cross‐section for antinucleons is based on a recent parametrization of a wide set of accelerator data. The production of light nuclei is calculated using coalescence models. The non annihilating inelastic scattering process for the antideuterons is discussed and taken into account for the first time via a more realistic procedure than used so far for antiprotons.

Coalescence (physics)

Antiproton

Parametrization (atmospheric modeling)

10.1063/1.2220440

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Citations (8)