A5062367977- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Atmospheric Ozone and Climate
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Radiation Therapy and Dosimetry
- Radioactive Decay and Measurement Techniques
- Laser Design and Applications
- Quantum and Classical Electrodynamics
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2013-2024
University of Turin
2014-2024
Istituto Nazionale di Fisica Nucleare
2012-2024
Centre National de la Recherche Scientifique
2014-2023
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2000-2023
Stockholm University
2021-2023
AlbaNova
2021-2023
Laboratoire AstroParticule et Cosmologie
2021
RWTH Aachen University
2018-2021
Dublin Institute For Advanced Studies
2021
We calculate the antiproton flux due to relic neutralino annihilations, in a two-dimensional diffusion model compatible with stable and radioactive cosmic ray nuclei. find that uncertainty primary induced by propagation parameters alone is about two orders of magnitude at low energies, it mainly determined lack knowledge thickness diffusive halo. On contrary, different dark matter density profiles do not significantly alter flux: Novarro-Frenk-White distribution produces fluxes which are...
We confirm and extend the recent finding that central surface density r_0*rho_0 galaxy dark matter halos, where r_0 rho_0 are halo core radius density, is nearly constant independent of luminosity. Based on co-added rotation curves about 1000 spiral galaxies, mass models individual dwarf irregular galaxies late early types with high-quality and, galaxy-galaxy weak lensing signals from a sample elliptical we find log(r_0*rho_0) = 2.15 +- 0.2, in units log(Msol/pc^2). also show observed...
Cosmic-ray nuclei fluxes are expected to be measured with high precision in the near future. For instance, high-quality data on antiproton component could give important clues about nature of astronomical dark matter. A very good understanding different aspects cosmic-ray propagation is therefore necessary. In this paper, we use constraints diffusion parameters. Propagation studied semianalytical solutions a model, and new analytical for radioactively produced species. Our model includes...
Indirect detection signals from dark matter annihilation are studied in the positron channel. We discuss detail propagation inside galactic medium: we present novel solutions of diffusion and equations focus on determination astrophysical uncertainties which affect signal. find scenarios models that nicely fit existing data fraction. Finally, predictions both fraction flux for already running or planned space experiments, concluding they have potential to discriminate a possible signal...
A new calculation of the p[over ]/p ratio in cosmic rays is compared to recent PAMELA data. The good match up 100 GeV allows us set constraints on exotic contributions from thermal weakly interacting massive particle (WIMP) dark matter candidates. We derive stringent limits possible enhancements WIMP p flux: a mWIMP=100 (1 TeV) signal cannot be increased by more than factor 6 (40) without overrunning Annihilation through W+W- channel also inspected and cross-checked with e+/(e-+e+) This...
Cosmic ray antiprotons provide an important probe for the study of galactic Dark Matter, as they could be produced by exotic sources. On other hand, are anyway standard nuclear reactions cosmic nuclei on interstellar matter. This process is responsible a background flux that must carefully determined to estimate detectability hypothetical signal. Estimates this suffer from potential uncertainties various origins. The propagation depends several physical characteristics Galaxy which poorly...
Once the energy spectrum of secondary component is well understood, measurements antiproton cosmic-ray flux at Earth will be a powerful way to indirectly probe for existence supersymmetric relics in galactic halo. Unfortunately, it still spoiled by considerable theoretical uncertainties. As shown this work, searches low-energy antideuterons appear meantime as plausible alternative, worth being explored. Above few $\mathrm{GeV}/n,$ dozen spallation should collected future Alpha Magnetic...
<i>Context. <i/> Secondary positrons are produced by spallation of cosmic rays within the interstellar gas. Measurements have been typically expressed in terms positron fraction, which exhibits an increase above 10 GeV. Many scenarios proposed to explain this feature, among them some additional primary originating from dark matter annihilation Galaxy.<i>Aims. The PAMELA satellite has provided high quality data that enabled accuracy statistical analyses be made, showing fraction extends up...
We analyse predictions of the CR lepton fluxes at Earth both secondary and primary origins, evaluate theoretical uncertainties, determine their level consistency with respect to available data. For propagation, we use a relativistic treatment energy losses for which provide useful parameterizations. compute components by improving on method that derived earlier positrons. primaries, estimate contributions from astrophysical sources (supernova remnants pulsars) considering all known local...
Active galactic nuclei (AGN) with jets seen at small viewing angles are the most luminous and abundant objects in $\gamma$-ray sky. AGN misaligned along line-of-sight appear fainter sky, but more numerous than brighter blazars. We calculate diffuse emission due to population of (MAGN) unresolved by Large Area Telescope (LAT) on {\it Fermi} Gamma-ray Space ({\it Fermi}). A correlation between luminosity radio-core is established demonstrated be physical statistical tests, as well compatible...
A new estimation of the isotropic diffuse gamma-ray background (IGRB) observed by Large Area Telescope (LAT) on board Fermi Gamma-ray Space (Fermi) has been presented for 50 months data, in energy range 100 MeV-820 GeV and different modelings Galactic foreground. We attempt here interpretation Fermi-LAT IGRB data terms unresolved emission from extragalactic populations. find very good fits to experimental IGRB, obtained with theoretical predictions active galactic nuclei star-forming...
Theoretical predictions for the cosmic antiproton spectrum currently fall short of corresponding experimental level accuracy. Among main sources uncertainty are production cross sections in ray inelastic interactions. We analyse existing data on $pp$ scattering, including first time measurements performed by NA49 Collaboration. compute finding that energy range where available (antiproton energies about 4-550 GeV) different approaches lead to almost equivalent results, with an 10-20\%....
We perform a combined analysis of the recent AMS-02 data on electrons, positrons, electrons plus positrons and positron fraction, in self-consistent framework where we realize theoretical modeling all astrophysical components that can contribute to observed fluxes whole energy range. The primary electron contribution is modeled through sum an average flux from distant sources local supernova remnants Green catalog. secondary originate interactions interstellar medium cosmic rays, for which...
The HAWC Collaboration has discovered a $\ensuremath{\gamma}$-ray emission extended about 2 degrees around the Geminga and Monogem pulsar wind nebulae (PWNe) at energies ${E}_{\ensuremath{\gamma}}>5\text{ }\text{ }\mathrm{TeV}$. We analyze, for first time, almost 10 years of data obtained with Fermi Large Area Telescope ${E}_{\ensuremath{\gamma}}>8\text{ }\mathrm{GeV}$ in direction Monogem. Since these two pulsars are close to Galactic plane we run our analysis ten different interstellar...
The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature dark matter and other new astrophysical phenomena, could be used with species to understand production propagation in Galaxy. For instance, low-energy antideuterons would provide a "smoking gun" signature annihilation or decay, essentially free background. Studies recent years have emphasized that models must considered together abundant cosmic antiprotons any potential observation...
The predictions of our previous analyses about possible low-mass (lower than 50 GeV) relic neutralinos are discussed in the light most recent results from WIMP direct detection experiments. It is proved that these quite compatible with new annual-modulation data DAMA Collaboration; theoretical also compared upper bounds CDMS and EDELWEISS Collaborations.
We discuss to what extent the present experiments of direct search for weakly interacting massive particles (WIMPs), when interpreted in terms relic neutralinos, probe interesting regions supersymmetric parameter space, which are also being progressively explored at accelerators. Our analysis is performed a number different schemes. derive relevant neutralino cosmological properties, locally and on average universe. prove that part (SUSY) configurations probed by current WIMP entails...
In the framework of an effective minimal supersymmetric extension standard model without gaugino-mass unification at a grand scale, we set lower bound on neutralino mass based new WMAP data ${\ensuremath{\Omega}}_{\mathrm{CDM}}$ $(R$-parity conservation is assumed). Our ${m}_{\ensuremath{\chi}}\ensuremath{\gtrsim}6\mathrm{GeV}$ leaves much room for relic neutralinos significantly lighter than those commonly considered ${(m}_{\ensuremath{\chi}}\ensuremath{\gtrsim}50\mathrm{GeV}).$ We prove...
The most recent results from direct searches for dark matter particles in the galactic halo are examined terms of an effective Minimal Supersymmetric extension Standard Model at electroweak scale without gaugino masses unification. We show that annual modulation effect 8.2 $σ$ C.L. recently presented by DAMA Collaboration, as result a combined analysis DAMA/NaI and DAMA/LIBRA experiments total exposure 0.82 ton yr, fits remarkably well with what expected relic neutralinos wide variety WIMP...
Antideuterons are among the most promising galactic cosmic-ray-related targets for dark matter indirect detection. Currently only upper limits exist on flux, but development of new experiments, such as GAPS and AMS-02, provides exciting perspectives a positive measurement in near future. In this paper, we present novel updated calculation both secondary primary $\overline{d}$ fluxes. We employ two-zone diffusion model which successfully reproduces cosmic-ray nuclear data observed antiproton...
Cosmic rays are an important tool to study dark matter annihilation in our Galaxy. Recently, a possible hint for was found the antiproton spectrum measured by AMS-02, even though result might be affected theoretical uncertainties. A complementary way test its interpretation would observation of low-energy antinuclei cosmic rays. We determine chances observe antideuterons with GAPS and implications ongoing AMS-02 antihelium searches. find that corresponding antideuteron signal is within...
ABSTRACT The dense stellar environment of the Galactic center has been proposed to host a large population as-yet undetected millisecond pulsars (MSPs). Recently, this hypothesis found support in an analysis gamma-rays detected using Large Area Telescope onboard Fermi satellite, which revealed excess diffuse GeV photons inner 15 deg about center. can be interpreted as collective emission thousands MSPs bulge, with spherical distribution strongly peaked toward In order fully establish MSP...
Blazars represent the most abundant class of high-energy extragalactic $\gamma$-ray sources. The subset blazars known as BL Lac objects is on average closer to Earth and characterized by harder spectra at high energy than whole sample. fraction Lacs that too dim be detected resolved current telescopes therefore expected contribute isotropic diffuse background (IGRB). IGRB has been recently measured over a wide range Large Area Telescope (LAT) board Gamma-ray Space ({\it Fermi}). We present...