A5051397820- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Conferences and Exhibitions Management
- Social Acceptance of Renewable Energy
- Radio Wave Propagation Studies
- Particle Accelerators and Free-Electron Lasers
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Opportunistic and Delay-Tolerant Networks
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Geophysics and Sensor Technology
- Historical and Literary Studies
- Particle Detector Development and Performance
- Science Education and Perceptions
- Radioactivity and Radon Measurements
Sorbonne Université
2013-2025
Vrije Universiteit Brussel
2021-2025
Institut d'Astrophysique de Paris
2016-2025
Centre National de la Recherche Scientifique
2015-2025
Pennsylvania State University
2024
Tokushima University
2022-2023
Peking University
2023
Karlsruhe Institute of Technology
2023
Tohoku University
2022
Campbell Collaboration
2021
The origin of the highest energy cosmic rays is still unknown. discovery their sources will reveal workings most energetic astrophysical accelerators in universe. Current observations show a spectrum consistent with an extragalactic sources. Candidate range from birth compact objects to explosions related gamma-ray bursts or events active galaxies. We discuss main effects propagation cosmologically distant including interactions background radiation and magnetic fields. examine possible...
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search upgraded detector with almost double amount of xenon and ultralow radioactivity container, corresponding to exposure 970 kg yr ^{136}Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation xenon, have required use novel background rejection...
While propagating from their source to the observer, ultrahigh energy cosmic rays interact with cosmological photon backgrounds and generate so-called "cosmogenic neutrinos". Here we study parameter space of cosmogenic neutrino flux given recent ray data updates on plausible evolution models. The shape normalization are very sensitive some current unknowns sources composition. We investigate various chemical compositions maximum proton acceleration energies E_p,max which allowed by...
The interaction of ultra-high-energy cosmic rays (UHECRs) with pervasive photon fields generates associated cosmogenic fluxes neutrinos and photons due to photohadronic photonuclear processes taking place in the intergalactic medium. We perform a fit UHECR spectrum composition measured by Pierre Auger Observatory for four source emissivity scenarios: power-law redshift dependence one free parameter, active galactic nuclei, gamma-ray bursts, star formation history. show that negative...
We study the survival of ultrahigh energy nuclei injected in clusters galaxies, as well their secondary neutrino and photon emissions, using a complete numerical propagation method realistic modeling magnetic, baryonic, photonic backgrounds. It is found that heavy highly depends on injection position profile magnetic field. Taking into account limited lifetime central source could also lead some cases to detection cosmic-ray afterglow, temporally decorrelated from gamma-ray emissions....
Fast-spinning newborn pulsars are intriguing candidate sources of ultrahigh-energy cosmic rays (UHECRs). The acceleration particles with a given composition in fraction the extragalactic pulsar population can give consistent explanation for measurements Auger Observatory. We calculate associated diffuse neutrino flux produced while cross supernova ejecta surrounding stars. show that minimal scenarios compatible UHECR data, effective optical depth to hadronuclear interactions is larger than...
Newly-born pulsars offer favorable sites for the injection of heavy nuclei, and their further acceleration to ultrahigh energies. Once accelerated in pulsar wind, nuclei have escape from surrounding supernova envelope. We examine this analytically numerically, discuss source scenario light latest energy cosmic ray (UHECR) data. Our calculations show that, at early times, when protons can be energies E>10^20 eV, young shell tends prevent escape. In contrast, because higher charge,...
We explore the effect of pulsars, in particular those born with millisecond periods, on their surrounding supernova ejectas. While they spin down, fast-spinning pulsars release tremendous rotational energy form a relativistic magnetized wind that can affect dynamics and luminosity supernova. estimate thermal non radiations expected from these specific objects, concentrating at times few years after onset explosion. find bolometric light curves present high plateau (that reach...
In this white paper we introduce the IMAGINE Consortium and its scientific background, goals structure. Our purpose is to coordinate facilitate efforts of a diverse group researchers in broad areas interstellar medium, Galactic magnetic fields cosmic rays, our goal develop more comprehensive insights into structures roles their interactions with rays. To achieve higher level self-consistency, depth rigour can only be achieved by coordinated experts astrophysics involved observational,...
Young, fast-rotating neutron stars are promising candidate sources for the production of ultrahigh energy cosmic rays (UHECRs). The interest in this model has recently been boosted by latest chemical composition measurements rays, that seem to show presence a heavy nuclear component at highest energies. Neutrons stars, with their metal-rich surfaces, potentially interesting such nuclei, but some open issues remain: 1) is it possible extract these nuclei from star's surface? 2) Do survive...
Newly-born, rapidly-spinning magnetars have been invoked as the power sources of super-luminous transients, including class "fast-luminous optical transients" (FBOTs). The extensive multi-wavelength analysis AT2018cow, first FBOT discovered in real time, is consistent with magnetar scenario and offers an unprecedented opportunity to comprehend nature these assess their broader implications. Using AT2018cow a prototype, we investigate high-energy neutrino cosmic ray production from FBOTs more...
Pulsars have been identified as good candidates for the acceleration of cosmic rays, up to ultra-high energies. However, a precise description processes at play is still be established. Using 2D particle-in-cell simulations, we study proton in axisymmetric pulsar magnetospheres. Protons and electrons are extracted from neutron star surface by strong electric field induced rotation star, positrons produced magnetosphere through pair production process. As has crucial impact on electromagnetic...
Astroparticle physics is undergoing a profound transformation, due to series of extraordinary new results, such as the discovery high-energy cosmic neutrinos with IceCube, direct detection gravitational waves LIGO and Virgo, many others. This white paper result collaborative effort that involved hundreds theoretical astroparticle physicists cosmologists, under coordination European Consortium for Theory (EuCAPT). Addressed whole community, it explores upcoming opportunities challenges our...
We present a search for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{136}$Xe using the full KamLAND-Zen 800 dataset with 745 kg enriched xenon, corresponding to an exposure $2.097$ ton yr $^{136}$Xe. This updated benefits from more than twofold increase in exposure, recovery photo-sensor gain, and reduced background muon-induced spallation xenon. Combining previous phase, we obtain lower limit $0\nu\beta\beta$ half-life $T_{1/2}^{0\nu} > 3.8 \times 10^{26}$ at 90% C.L., factor 1.7...
This paper provides an analytical description of the transport ultrahigh energy cosmic rays in inhomogeneously magnetized intergalactic medium. The latter is modeled as a collection scattering centers, such radio cocoons, galactic winds, clusters or filaments large scale structure, with negligible magnetic fields between. Magnetic deflection no longer continuous process, it rather dominated by events. We study interaction between high-energy and agents. then compute optical depth Universe to...
The acceleration of ultrahigh energy nuclei in fast spinning newborn pulsars can explain the observed spectrum cosmic rays and trend towards heavier for energies above 1019 eV as reported by Auger Observatory. Pulsar implies a hard injection ( ∼ E−1) due to pulsar spin down maximum Emax Z limit on rate neutron stars. We have previously shown that escape through young supernova remnant softens spectrum, decreases slightly energy, generates secondary nuclei. Here we show distribution birth...
Tidal disruptions are extremely powerful phenomena that have been designated as candidate sources of ultra-high-energy cosmic rays. The disruption a star by black hole can naturally provide protons and heavier nuclei, which be injected accelerated to ultra-high energies within jet. Inside the jet, nuclei likely interact with dense photon field, leading significant production neutrinos secondary particles. We model numerically propagation interactions high-energy in jetted tidal events order...
Next-generation radio experiments such as the detector of upgraded Pierre Auger Observatory and planned GRAND BEACON arrays target detection ultra-high-energy particle air showers arriving at low elevation angles. These inclined cosmic-ray develop higher in atmosphere than vertical ones, enhancing magnetic deflections electrons positrons inside cascade. We evidence two novel features their emission: a new polarization pattern, consistent with geosynchrotron emission model coherence loss...
Various experiments indicate the existence of a second knee around energy $E=3\ifmmode\times\else\texttimes\fi{}{10}^{17}\text{ }\text{ }\mathrm{eV}$ in cosmic ray spectrum. This feature could be signature end galactic component and emergence extragalactic one, provided that latter cuts off at low energies. Recent analytical calculations have shown this cutoff consequence magnetic fields (Refs. [M. Lemoine, Phys. Rev. D 71, 083007 (2005).][R. Aloisio V. Berezinsky, Astrophys. J. 625, 249...
The recent detection of the gravitational wave source GW150914 by LIGO collaboration motivates a speculative for origin ultrahigh energy cosmic rays as possible byproduct immense energies achieved in black hole mergers, provided that holes have spin seems inevitable and there are relic magnetic fields disk debris remaining from formation or their accretion history. We argue given modest efficiency $< 0.01$ required per event unit release, merging potentially provide an environment...
High-energy neutrino astronomy will probe the working of most violent phenomena in Universe. The Giant Radio Array for Neutrino Detection (GRAND) project consists an array ∼ 105 radio antennas deployed over 200 000 km2 a mountainous site. It aims at detecting high-energy neutrinos via measurement air showers induced by decay atmosphere τ leptons produced interaction cosmic under Earth surface. Our objective with GRAND is to reach sensitivity 5 × 10−11E−2 GeV−1 cm−2 s−1 sr−1 above 3 1016 eV....
We report a measurement of the strange axial coupling constant ${g}_{A}^{s}$ using atmospheric neutrino data at KamLAND. This is component form factor neutral-current quasielastic (NCQE) interaction. The value significantly changes ratio proton and neutron NCQE cross sections. KamLAND suitable for measuring interactions as it can detect nucleon recoils with low-energy thresholds measure multiplicity high efficiency. data, including information on associated interactions, makes possible to...