A5039666085- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Particle physics theoretical and experimental studies
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Astro and Planetary Science
- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Energetic Materials and Combustion
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2005-2025
University of Naples Federico II
2011-2025
University of Turku
2023
Centre National de la Recherche Scientifique
2009-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
Niels Brock
2023
University of Copenhagen
2023
Main Astronomical Observatory
2023
Taras Shevchenko National University of Kyiv
2023
National Academy of Sciences of Ukraine
2023
The injection of secondary particles produced by dark matter (DM) annihilation around redshift $\ensuremath{\sim}1000$ would inevitably affect the process recombination, leaving an imprint on cosmic microwave background (CMB) anisotropies and polarization. We show that most recent CMB measurements provided WMAP satellite mission place interesting constraints DM self-annihilation rates, especially for models exhibit a large Sommerfeld enhancement cross section, as recently proposed to fit...
We show that current microlensing and dynamical observations of the Galaxy permit to set interesting constraints on Dark Matter local density profile slope towards galactic centre. Assuming state-of-the-art models for distribution baryons in Galaxy, we find most commonly discussed profiles (viz. Navarro-Frenk-White Einasto) are consistent with observations, while extreme adiabatically compressed robustly ruled out. When a baryonic model also includes description gas is adopted, our analysis...
The injection of secondary particles produced by Dark Matter (DM) annihilation at redshift 100<z<1000 affects the process recombination, leaving an imprint on Cosmic Microwave Background (CMB) anisotropies. Here we provide a new assessment constraints set CMB data mass and self-annihilation cross-section DM particles. Our analysis includes most recent WMAP (7-year) ACT data, as well improved treatment time-dependent coupling between energy with thermal gas. We show in particular that...
An accurate knowledge of the dark matter distribution in Milky Way is crucial importance for galaxy formation studies and current searches particle matter. In this paper we set new dynamical constraints on Galactic profile by comparing observed rotation curve, updated with a comprehensive compilation kinematic tracers, that inferred from wide range observation-based morphologies bulge, disc gas. The generalised Navarro-Frenk-White (NFW) Einasto profiles are fitted to data order determine...
Dark Matter annihilations after recombination and during the epoch of structure formation deposit energy in primordial intergalactic medium, producing reionization heating. We investigate constraints that are imposed by observed optical depth Universe measured temperature gas. find bounds significant, have power to rule out large portions `DM mass/cross section' parameter space. The bound is generally stronger does not depend significantly on history formation. can be competitive some cases...
Anisotropies of the cosmic microwave background (CMB) have proven to be a very powerful tool constrain dark matter annihilation at epoch recombination. However, CMB constraints are currently derived using number reasonable but yet untested assumptions that could potentially lead misestimation true bounds (or any reconstructed signal). In this paper we examine potential impact these systematic effects. particular, separately study propagation secondary particles produced by in two energy...
We analyse in detail the standard primordial nucleosynthesis scenario. In particular, we discuss key theoretical issues which are involved a detailed prediction of light nuclide abundances, such as weak reaction rates, neutrino decoupling and nuclear rate modelling. also perform new analysis available data on main processes entering network, with particular stress their uncertainties well role determining corresponding estimates. The current status versus experimental results for 2H, 3He,...
We study the effect of dark matter (DM) particles in Sun, focusing, particular, on possible reduction solar neutrinos flux due to energy carried away by DM from innermost regions and consequent temperature core. find that very low-mass range between 4 10 GeV, recently advocated explain findings DAMA CoGent experiments, effects neutrino fluxes are detectable only for models with a small, or vanishing, self-annihilation cross section, such as so-called asymmetric models, we combination masses...
In this work we characterize the distribution of Dark Matter (DM) in Milky Way (MW), and its uncertainties, adopting well known "Rotation Curve" method. We perform a full marginalization over uncertainties Galactic Parameters lack knowledge on morphology baryonic components Galaxy. The local DM density ρ0 is constrained to range 0.3– 0.8 GeV/cm3 at 2 σ level, has strong positive correlation R0, distance from Center. not well-known value R0 thus, moment, major limitation determining ρ0....
We present a new estimate of the mass Milky Way, inferred via Bayesian approach by making use tracers circular velocity in disk plane and stars stellar halo, as from publicly available galkin compilation. rotation curve method to determine dark matter distribution total under different assumptions for profile, while is constrained surface density microlensing measurements. also include uncertainties on baryonic morphology model averaging, thus converting potential source systematic error...
We report on the status of primordial nucleosynthesis in light recent results CMB anisotropies from WMAP experiment. Theoretical estimates for nuclei abundances, along with corresponding uncertainties, are evaluated using a new numerical code, where all nuclear rates usually considered have been updated most available data. Moreover, additional processes neglected previous calculations included. The combined analysis and prediction Deuterium gives an effective number relativistic degrees...
Assuming that dark matter is dominated by WIMPs, it accretes gravitational attraction and scattering over baryonic material annihilates inside celestial objects, giving rise to a "dark luminosity" which may potentially affect the evolution of stars. We estimate luminosity achieved different kinds stars in halo with DM properties characteristic ones where first star formation episode occurs. find both massive, metal-free small, galactic-like can achieve luminosities comparable or exceeding...
Collider, space, and Earth based experiments are now able to probe several extensions of the Standard Model particle physics which provide viable dark matter candidates. Direct indirect searches rely on inputs astrophysical nature, such as local density or shape profile in target object. The determination these quantities is highly affected by uncertainties. latter, especially those for our own Galaxy, ill-known, often not fully accounted when analyzing phenomenology models. In this paper we...
We study the effects of WIMP dark matter (DM) on collapse and evolution first stars in Universe. Using a stellar code, we follow pre-Main Sequence (MS) phase grid metal-free with masses range 5-600 solar mass forming centre 1e6 halo at redhisft z=20. DM particles parent are accreted proto-stellar interior by adiabatic contraction scattering/capture processes, reaching central densities order 1e12 GeV/cm3 radii 10 AU. Energy release from annihilation reactions can effectively counteract...
We study the effects of feebly or nonannihilating weakly interacting dark matter (DM) particles on stars that live in DM environments denser than our Sun. find energy transport mechanism induced by can produce unusual conditions cores main sequence stars, with which potentially be used to probe properties. solar mass placed densities ${\ensuremath{\rho}}_{\ensuremath{\chi}}\ensuremath{\ge}{10}^{2}\text{ }\text{ }\mathrm{GeV}/{\mathrm{cm}}^{3}$ are sensitive spin-dependent scattering cross...
We present accurate and up-to-date constraints on the complete set of dimension five six operators with scalar, fermion vector dark matter (DM). find limits using LHC monojet data, spin independent dependent direct searches, relic density CMB, show interplay between high low energy data in setting bounds parameter space. In order to properly compare taken at different energies, we take into account effect running mixing operators. also local uncertainties affecting detection apply EFT...
Recent theoretical studies have revealed the possibly important role of capture and annihilation process weakly interacting massive particles (WIMPs) for first stars. Using new evolutionary models metal-free stars, we investigate impact such "dark matter burning" stars in different environments dark (DM) halos, terms ambient WIMP density (ρχ). We find that, agreement with existing literature, stellar lifetimes can be significantly prolonged a certain range ρχ (i.e., 1010≲ ρχ[GeV cm −3] ≲...
We include an energy term based on dark matter (DM) self-annihilation during the cooling and subsequent collapse of metal-free gas, in haloes hosting formation first stars Universe. find that feedback induced chemistry cloud does modify properties gas throughout collapse. However, modifications are not dramatic, typical Jeans mass within halo is conserved collapse, for all DM parameters we have considered. This result implies presence annihilations substantially initial function stars, with...