A5022481432- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Black Holes and Theoretical Physics
- Rare-earth and actinide compounds
- Advanced Thermodynamics and Statistical Mechanics
- Radiative Heat Transfer Studies
- Infrared Target Detection Methodologies
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Big Data Technologies and Applications
- Calibration and Measurement Techniques
- Non-Destructive Testing Techniques
- Quantum Electrodynamics and Casimir Effect
- Quantum Mechanics and Applications
- Agriculture Sustainability and Environmental Impact
- Freezing and Crystallization Processes
IMT Atlantique
2020-2025
Laboratoire de Physique Subatomique et des Technologies Associées
2020-2025
Institut National de Physique Nucléaire et de Physique des Particules
2020-2024
Nantes Université
2020-2024
Centre National de la Recherche Scientifique
2020-2024
European Organization for Nuclear Research
2017-2019
University of Bern
2015-2016
McGill University
2013-2014
Isotopen Technologien München (Germany)
2013
Technical University of Munich
2010-2011
In a framework that makes close contact with modern effective field theories for nonrelativistic bound states at zero temperature, we study the real-time evolution of static quark-antiquark pair in medium gluons and light quarks finite temperature. For temperatures ranging from values larger to smaller than inverse distance quark antiquark, $1/r$, short distances, derive potential between two sources, calculate their energy thermal decay width. Two mechanisms contribute width: imaginary part...
The thermal plasma in the early Universe produced a stochastic gravitational wave (GW) background, which peaks today microwave regime and was dubbed cosmic background (CGMB). In previous works, only single graviton production processes that contribute to CGMB have been considered. Here, we also investigate pair show these can lead significant contribution if ratio between maximum temperature Planck mass, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
A bstract We compute the production rate of energy density carried by gravitational waves emitted a Standard Model plasma in thermal equilibrium, consistently to leading order coupling constants for momenta k ∼ πT . Summing up contributions from full history universe, highest temperature radiation epoch can be constrained so-called N eff parameter. The current theoretical uncertainty ∆ ≤ 10 − 3 corresponds T max 2 × 17 GeV. In course computation, we show how subpart determined with help...
A bstract Hot axions, thermally produced in the Early Universe, would contribute to dark radiation and are thus subject present future constraints from N eff . In this paper we quantify contribution its uncertainty models with axion-gluon couplings thermal dynamics above QCD transition. more detail, determine leading-order axion production rate for momenta of order temperature adopting three different schemes incorporation collective soft gluons. We show how these extrapolate differently...
We compute the shear viscosity of QCD with matter, including almost all next-to-leading order corrections -- that is, suppressed by one power $g$ relative to leading order. argue still missing terms are small. The large and bring $\eta/s$ down more than a factor 3 at physically relevant couplings. perturbative expansion is problematic even $T \simeq 100$ GeV. largest correction arises from modifications qhat parameter, which determines rate transverse momentum diffusion. also explore quark...
Starting from operator equations of motion and making arguments based on a separation time scales, set is derived which govern the non-equilibrium evolution GeV-scale sterile neutrino density matrix active lepton number densities at temperatures T ≳ 130 GeV. The possesses generation helicity indices; we demonstrate how permits for classification various sources leptogenesis. coefficients parametrizing are determined to leading order in Standard Model couplings, accounting LPM resummation 1 +...
We estimate the thermal masses and damping rates of active (m < eV) sterile (M ~ GeV) neutrinos with momenta k 3T at temperatures below electroweak crossover (5 GeV T 160 GeV). These quantities fix equilibration or "washout" Standard Model lepton number densities. Sterile interact via direct scatterings mediated by Yukawa couplings, their overlap neutrinos. Including all leading-order reactions we find that washout rate generally exceeds Hubble for 5 30 GeV. Therefore it is challenging to...
We study the Polyakov loop and correlator of two loops at finite temperature in weak-coupling regime. calculate order ${g}^{4}$. The calculation is performed distances shorter than inverse for electric screening masses larger Coulomb potential. In this regime, it accurate up to ${g}^{6}$. also evaluate Polyakov-loop an effective field theory framework that takes advantage hierarchy energy scales problem makes explicit bound-state dynamics. framework, we show leading multipole expansion sum a...
We present a computation, within weakly-coupled thermal QCD, of the production rate low invariant mass (M 2 ~ g T 2) dileptons, at next-to-leading order (NLO) in coupling (which is $$ \mathcal{O}\left({g}^3{e}^2{T}^2\right) ). This involves extending NLO calculation photon which we recently presented to case small nonzero mass. Numerical results are discussed and tabulated forms code provided for inclusion hydrodynamical models. find that corrections can increase dilepton by up 30–40%...
We estimate the photon production rate from an SU(3) plasma at temperatures of about $1.1{T}_{\mathrm{c}}$ and $1.3{T}_{\mathrm{c}}$. Lattice results for vector current correlator spatial momenta $k\ensuremath{\sim}(2\ensuremath{-}6)T$ are extrapolated to continuum limit analyzed with help a polynomial interpolation corresponding spectral function, which vanishes zero frequency matches high-precision perturbative large invariant masses. For small masses is compared next-to-leading-order...
The putative recent indication of an unidentified 3.55 keV X-ray line in certain astrophysical sources is taken as a motivation for improved theoretical computation the cosmological abundance 7.1 sterile neutrinos. If interpreted resulting from decay Warm Dark Matter, mass and mixing angle neutrino are known. Our then permits determination lepton asymmetry that needed producing correct via Shi-Fuller mechanism, well estimate non-equilibrium spectrum latter plays role structure formation...
We present an extension to next-to-leading order in the strong coupling constant g of AMY effective kinetic approach energy loss high momentum particles quark-gluon plasma. At leading order, transport jet-like is determined by elastic scattering with thermal constituents, and inelastic collinear splittings induced medium. reorganize this description into splittings, high-momentum-transfer scatterings, drag diffusion, particle conversions (momentum-preserving identity-changing processes)....
In many realizations of leptogenesis, heavy right-handed neutrinos play the main role in generation an imbalance between matter and antimatter early Universe. Hence, it is relevant to address quantitatively their dynamics a hot dense environment by taking into account various thermal aspects problem at hand. The strong washout regime offers interesting framework carry out calculations systematically reduce theoretical uncertainties. Indeed, any matter–antimatter asymmetry generated when...
Abstract The thermal plasma filling the early universe generated a stochastic gravitational wave background that peaks in microwave frequency range today. If graviton production rate is expressed as series fine-structure constant, α , and temperature over Planck mass, T 2 / m pl then lowest-order contributions come from single (∼ αT ) double 4 via → scatterings. We show Standard Model, single-graviton dominates if maximal smaller than × 10 18 GeV. This justifies previous calculations which...
Abstract The climate crisis and the degradation of world's ecosystems require humanity to take immediate action. international scientific community has a responsibility limit negative environmental impacts basic research. HECAP+ communities ( High Energy Physics, Cosmology, Astroparticle Hadron Nuclear Physics ) make use common similar experimental infrastructure, such as accelerators observatories, rely similarly on processing big data. Our therefore face challenges improving sustainability...
In this review article, we discuss the current status and future prospects of perturbation theory as a means studying equilibrium thermodynamic near-equilibrium transport properties deconfined QCD matter. We begin with brief introduction to general topic, after which in some detail foundations modern techniques real- imaginary-time formalisms thermal field theory, covering e.g. different bases used real-time formalism resummations required deal soft collinear contributions. After this,...
We provide the first next-to-leading-order (NLO) weak-coupling description of thermalization process far-from-equilibrium systems in non-Abelian gauge theory. study isotropic starting from either over- or underoccupied initial conditions and follow their time evolution toward thermal equilibrium by numerically solving QCD effective kinetic theory at NLO accuracy. find that corrections remain well under control for a wide range couplings overall effect is to reduce needed reach considered.
We study the three-quark static potential in perturbation theory QCD. A complete next-to-leading order calculation is performed singlet, octets, and decuplet channels exponentiation demonstrated. The mixing of octet representations calculated. At next-to-next-to-leading order, subset diagrams producing three-body forces identified Coulomb gauge its contribution to Combining it with two-body forces, which may be extracted from quark-antiquark potential, we obtain color-singlet channel.
We present an overview of a perturbative-kinetic approach to jet propagation, energy loss, and momentum broadening in high temperature quark–gluon plasma. The leading-order kinetic equations describe the interactions between energetic jet-particles non-abelian plasma, consisting on-shell thermal excitations soft gluonic fields. These include [Formula: see text] scatterings, collinear bremsstrahlung, drag diffusion. show how contribution from fields can be factorized into set Wilson line...
We compute the hydrodynamic relaxation times τ_{π} and τ_{j} for hot QCD at next-to-leading order in coupling with kinetic theory. show that certain dimensionless ratios of second-order to first-order transport coefficients obey bounds which apply whenever a theory description is possible; computed values lie somewhat above these bounds. Strongly coupled theories holographic duals strongly violate bounds, highlighting their distance from quasiparticle description.