Daniele Gaggero
A5007555624- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Black Holes and Theoretical Physics
- Astrophysical Phenomena and Observations
- Radiation Therapy and Dosimetry
- Atomic and Subatomic Physics Research
- Photocathodes and Microchannel Plates
- Atmospheric Ozone and Climate
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Superconducting Materials and Applications
- Numerical methods in inverse problems
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Radiomics and Machine Learning in Medical Imaging
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2008-2024
Universitat de València
2022-2024
Parc Científic de la Universitat de València
2024
Université Paris Cité
2017-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017-2023
Centre National de la Recherche Scientifique
2012-2023
Universidad Autónoma de Madrid
2017-2023
Stockholm University
2021-2023
AlbaNova
2021-2023
Instituto de Física Corpuscular
2022-2023
Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with large acceptance exceeding 2 m;{2} sr at 300 GeV. Building on analysis, we have developed efficient detection strategy which provides sufficient background rejection for measurement of steeply falling spectrum up to 1 TeV. Our high precision data show that falls energy E-3.0 and does not exhibit prominent spectral features. Interpretations in terms conventional diffusive...
The gamma-ray sky >100 MeV is dominated by the diffuse emissions from interactions of cosmic rays with interstellar gas and radiation fields Milky Way. Observations these provide a tool to study cosmic-ray origin propagation, medium. We present measurements first 21 months Fermi-LAT mission compare models emission generated using GALPROP code. are fitted data incorporate astrophysical input for distribution sources, fields. To assess uncertainties associated input, grid created varying...
We report on the first Fermi Large Area Telescope (LAT) measurements of so-called "extragalactic" diffuse gamma-ray emission (EGB). This component is generally considered to have an isotropic or nearly distribution sky with diverse contributions discussed in literature. The derivation EGB based detailed modeling bright foreground Galactic emission, detected LAT sources, and solar emission. find spectrum consistent a power law differential spectral index gamma = 2.41 +/- 0.05 intensity I(>100...
We present the results of our analysis cosmic-ray electrons using about $8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ electron candidates detected in first 12 months on-orbit by Fermi Large Area Telescope. This work extends previously published spectrum down to 7 GeV, giving a spectral range approximately 2.5 decades up 1 TeV. describe detail and its validation beam-test data. In addition, we measured via subset events selected for best energy resolution as cross-check on measurement full...
We model the transport of cosmic ray nuclei in galaxy by means a new numerical code. At variance with previous models, ours accounts for generic spatial distribution diffusion coefficient. found that case radially uniform diffusion, main secondary/primary ratios (B/C, N/O and sub-Fe/Fe) modulated antiproton spectrum consistently match available observations. Convection re-acceleration do not seem to be required energy range we consider: 1≤E≤103 GeV/nucleon. generalize these results,...
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
We present version 2 of the DRAGON code designed for computing realistic predictions CR densities in Galaxy. The numerically solves interstellar transport equation (including inhomogeneous and anisotropic diffusion, either space momentum, advective energy losses), under conditions. new includes an updated numerical solver several models astrophysical ingredients involved equation. Improvements accuracy solution are proved against analytical solutions reference diffusion scenarios. novel...
Large dark matter overdensities can form around black holes of astrophysical and primordial origin as they grow. This ``dark dress'' inevitably affects the dynamical evolution binary systems induces a dephasing in gravitational waveform that be probed with future interferometers. In this paper, we introduce new analytical model to rapidly compute waveforms presence an evolving distribution. We then present Bayesian analysis determining when dressed hole binaries distinguished from...
The diffuse Galactic gamma-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on Compton Observatory indicated excess > 1 GeV relative to models consistent directly measured CR spectra (the so-called ``EGRET excess''). was observed in all directions sky, a variety of explanations have been proposed, including beyond-the-Standard-Model scenarios like annihilating or...
We model the accretion of gas onto a population massive primordial black holes in Milky Way, and compare predicted radio X-ray emission with observational data. show that under conservative assumptions on process, possibility ${\cal O}(10) \, M_\odot$ can account for all dark matter Way is excluded at $5\sigma$ by comparison VLA catalog $1.4$ GHz, $\simeq 40\sigma$ Chandra ($0.5 - 8$ keV). argue this method be used to identify such more sensitive future surveys.
We present the activities of `New Physics' working group for `Physics at TeV Colliders' workshop (Les Houches, France, 5--23 June, 2017). Our report includes new physics studies connected with Higgs boson and its properties, direct search strategies, reinterpretation LHC results in building viable models computational tool developments.
The formation of astrophysical and primordial black holes influences the distribution dark matter surrounding them. Black are thus expected to carry a ``dress'' whose properties depend on their mechanism environment. Here we out numerical analytical study merger dressed holes, show that around them dramatically affects dynamical evolution binaries. Although final impact rate is rather small with respect case ``naked'' argue our analysis places calculation this more solid ground, LIGO-Virgo...
A dark matter overdensity around a black hole may significantly alter the dynamics of hole's merger with another compact object. We consider here intermediate mass-ratio inspirals stellar-mass objects intermediate-mass holes "dressed" matter. first demonstrate that previous estimates based on fixed dark-matter dress are unphysical for range binaries and distributions by showing total energy dissipated object through dynamical friction, as it dense environment towards hole, is larger than...
The standard approach to cosmic-ray (CR) propagation in the Galaxy is based on assumption that local transport properties can be extrapolated whole CR confining volume. Such models tend underestimate gamma-ray flux above few GeV measured by Fermi Large Area Telescope towards inner Galactic plane. We consider here for first time a phenomenological scenario allowing both rigidity scaling of diffusion coefficient and convective effects position-dependent. show within this we reproduce observed...
Abstract The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over wide range of frequencies, and with an order magnitude greater sensitivity survey speed than any current telescope. SKA will address many important topics in astronomy, ranging from planet formation distant galaxies. However, this work, we consider the perspective as facility for studying physics. We review four areas which expected make major contributions our understanding fundamental...
We study the compatibility of Alpha Magnetic Spectrometer (AMS-02) data on cosmic-ray (CR) positron fraction with CR electron and spectra provided by PAMELA Fermi LAT. do that in terms a novel propagation model which sources are distributed spiral arm patterns agreement astrophysical observations. While former interpretations assumed an unrealistically steep injection spectrum for background electrons, enhanced energy losses experienced leptons due to larger average source distance from...
A GeV gamma-ray excess has possibly been individuated in Fermi-LAT data from the Galactic Center and interpreted terms of Dark Matter (DM) annihilations, either hadronic (essentially $b\bar{b}$) or leptonic channels. In order to test this tantalizing interpretation, we address two issues: (i) improve computation secondary emission DM (Inverse Compton Bremsstrahlung) with respect previous works, confirming it be very relevant for determining spectrum channels, so that any conclusion on nature...
Understanding the isotopic composition of cosmic rays (CRs) observed near Earth represents a milestone towards identification their origin. Local fluxes contain all known stable and long-lived isotopes, reflecting complex history primaries secondaries as they traverse interstellar medium. For that reason, numerical code which aims at describing CR transport in Galaxy must unavoidably rely on accurate modelling production secondary particles. In this work we provide detailed description...
Context. The Tibet AS γ and LHAASO collaborations recently reported the observation of a -ray diffuse emission with energy up to PeV level from Galactic plane. Aims. We discuss relevance non-uniform cosmic-ray transport scenarios implications these results for physics. Methods. used DRAGON HERMES codes build high-resolution maps spectral distributions that several representative models under condition they reproduce wide set local data 100 PeV. Results. show spectra measured by , LHAASO,...
Multichannel cosmic ray spectra and the large scale anisotropy can hardly be made compatible in framework of conventional isotropic homogeneous propagation models. These models also have problems explaining longitude distribution radial emissivity gradient γ-ray Galactic interstellar emission. We argue here that accounting for a physically motivated correlation between escape time spatially dependent magnetic turbulence power naturally solve both problems. Indeed, by exploiting this we find...
We compute the γ-ray and neutrino diffuse emission of Galaxy on basis a recently proposed phenomenological model characterized by radially dependent cosmic-ray (CR) transport properties. show how this model, designed to reproduce both Fermi-LAT data local CR observables, naturally reproduces anomalous TeV observed Milagro in inner Galactic plane. Above 100 our picture predicts flux that is about five (two) times larger than computed with conventional models Center region (full-sky)....