A5012129857- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Astronomical Observations and Instrumentation
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Radioactivity and Radon Measurements
- Advanced Thermodynamics and Statistical Mechanics
- Photocathodes and Microchannel Plates
- Quantum Information and Cryptography
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2016-2025
University of Turin
2016-2025
Virginia Tech
2017
Istituto Nazionale di Fisica Nucleare
2011-2015
Max Planck Society
2015
Max Planck Institute for Radio Astronomy
2015
University of Cape Town
2009-2012
Centre for High Performance Computing
2011
City of Cape Town
2010
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2008
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...
Assuming axion-like particles account for the entirety of dark matter in Universe, we study possibility detecting their decay into photons at radio frequencies. We discuss different astrophysical targets, such as dwarf spheroidal galaxies, Galactic Center and halo, galaxy clusters. The presence an ambient radiation field leads to a stimulated enhancement rate; depending on environment mass axion, effect emission may amplify photon flux by serval orders magnitude. For axion-photon couplings...
We use MUSE spectroscopic observations of the dwarf spheroidal galaxy Leo T between 470 and 935 nm to search for radiative decays axion like particles (ALPs). Under assumption that ALPs constitute dark matter component halo, we derive bounds on effective ALP-two-photon coupling. improve existing limits by more than one order magnitude in ALP mass range 2.7-5.3 eV.
Abstract Nearby dwarf spheroidal galaxies are ideal targets in the search for indirect dark matter (DM) signals. In this work, we analyze MUSE spectroscopic observations of a sample five galaxies, composed both classical and ultra-faint spheroidals. The goal is to radiative decays axion-like particles (ALPs) mass range 2.7–5.3 eV. After taking into account uncertainties associated with DM spatial distribution derive robust bounds on effective ALP-two-photon coupling. They lie well below QCD...
We perform a systematic study of the multiwavelength signal induced by weakly interacting massive particle (WIMP) annihilations at Galactic Center (GC). Referring to generic WIMP dark matter (DM) scenario and depending on astrophysical inputs, we discuss spectral angular features sketch correlations among signals in different energy bands. None components which have been associated GC source Sgr ${\mathrm{A}}^{*}$, nor diffuse emission from region, or typical DM source. Still, data sets all...
We discuss the positive indications of a possible dark matter signal in direct detection experiments terms mechanism interaction between particle and nuclei occurring via exchange light mediator, resulting long-range interaction. analyze annual modulation results observed by DAMA CoGeNT excess events CRESST. In our analysis, we relevance uncertainties related to velocity distribution galactic channeling effect NaI. find that force is viable mechanism, which can provide full agreement...
The Square Kilometre Array (SKA) will answer fundamental questions about the origin, evolution, properties, and influence of magnetic fields throughout Universe. Magnetic can illuminate phenomena as diverse star formation, galactic dynamics, fast radio bursts, active nuclei, large-scale structure, dark matter annihilation. Preparations for SKA are swiftly continuing worldwide, community is making tremendous observational progress in field cosmic magnetism using data from a powerful...
Abstract We summarize the second radio synchrotron background workshop, which took place on 2022 June 15–17 in Barolo, Italy. This meeting was convened because available measurements of diffuse zero level continue to suggest that it is several times higher than can be attributed known Galactic and extragalactic sources processes, rendering least well-understood electromagnetic at present a major outstanding question astrophysics. The workshop agreed next priorities for investigations this...
The ARCADE 2 Collaboration has recently measured an isotropic radio emission which is significantly brighter than the expected contributions from known extra-galactic sources. simplest explanation of such excess involves a "new" population unresolved sources become most numerous at very low (observationally unreached) brightness. We investigate this scenario in terms synchrotron radiation induced by WIMP annihilations or decays extragalactic halos. Intriguingly, for light-mass WIMPs with...
The dimming of Type Ia supernovae could be the result Hubble-scale inhomogeneity in matter and spatial curvature, rather than signaling presence a dark energy component. A key challenge for such models is to fit detailed spectrum cosmic microwave background (CMB). We present discussion small-scale CMB an inhomogeneous universe, focusing on spherically symmetric `void' models. allow dynamical effects radiation while analyzing problem, contrast other work which inadvertently fine tunes its...
Both cosmic shear and cosmological gamma-ray emission stem from the presence of dark matter (DM) in universe: DM structures are responsible for bending light weak-lensing regime those same objects can emit gamma rays, either because they host astrophysical sources (active galactic nuclei or star-forming galaxies) directly by annihilations (or decays, depending on properties particle). Such rays should therefore exhibit strong correlation with signal. In this Letter, we compute...
If dark matter (DM) is composed by particles which are nongravitationally coupled to ordinary matter, their annihilations or decays in cosmic structures can result detectable radiation. We show that the most powerful technique detect a particle DM signal outside Local Group study angular cross-correlation of nongravitational signals with low-redshift gravitational probes. This method allows us enhance noise from regions Universe where DM-induced emission preferentially generated. demonstrate...
Anisotropies in the electromagnetic emission produced by dark matter annihilation or decay extragalactic sky are a recent tool quest for particle evidence. We review formalism to compute two-point angular power spectrum halo-model approach and discuss features relative size of various auto- cross-correlation signals that can be envisaged anisotropy studies. From side signals, we consider full multi-wavelength spectrum, from radio X-ray gamma-ray productions. spectra auto-correlation each...
We report the measurement of angular power spectrum cross-correlation between unresolved component Fermi-LAT gamma-ray sky-maps and CMB lensing potential map reconstructed by Planck satellite. The matter distribution in Universe determines bending light coming from last scattering surface. At same time, density drives growth history astrophysical objects, including their capability at generating non-thermal phenomena, which turn give rise to emissions. provides information on integrated...
We present a deep radio search in the Reticulum II dwarf spheroidal (dSph) galaxy performed with Australia Telescope Compact Array. Observations were conducted at 16 cm wavelength, an rms sensitivity of 0.01 mJy/beam, and goal searching for synchrotron emission induced by annihilation or decay weakly interacting massive particles (WIMPs). Data complemented observations on large angular scales taken KAT-7 telescope. find no evidence diffuse from dSph we derive competitive bounds WIMP...
Abstract We present a radio search for WIMP dark matter in the Large Magellanic Cloud (LMC). make use of recent deep image LMC obtained from observations Australian Square Kilometre Array Pathfinder (ASKAP), and processed as part Evolutionary Map Universe (EMU) survey. is an extremely promising target searches at frequencies because large J-factor presence substantial magnetic field. detect no evidence emission arising annihilations derive stringent bounds on annihilation rate function mass,...
Abstract We study the prospects in search of dark matter offered by newly selected NASA MeV mission COSI (Compton Spectrometer and Imager). This instrument is designed optimized to detect spectral lines, we show it offers an exquisite possibility directly decaying or annihilating into monochromatic gamma-rays. case, for example, axion-like particles (ALPs) which undergo decay two photons. Furthermore, that can lead important progress quest primordial black holes (PBHs) matter, through...
We present an extensive analysis on the determination of isotropic radio background. consider six different maps, ranging from 22 MHz to 2.3 GHz and covering a large fraction sky. The scale emission is modeled as linear combination component plus Galactic synchrotron radiation thermal bremsstrahlung. Point-like extended sources are either masked or accounted for by means template. find robust estimate background, with limited scatter among models. level background lies significantly above...
Our closest neighbours, the Local Group dwarf spheroidal (dSph) galaxies, are extremely quiescent and dim objects, where thermal non-thermal diffuse emissions lack, so far, of detection. In order to possibly study dSph interstellar medium, deep observations required. They could reveal associated with very low level star formation, or particle dark matter annihilating decaying in halo. this work, we employ radio six dSphs, conducted Australia Telescope Compact Array frequency band 1.1–3.1...
Our understanding of the $\gamma$-ray sky has improved dramatically in past decade, however, unresolved background (UGRB) still a potential wealth information about faintest sources pervading Universe. Statistical cross-correlations with tracers cosmic structure can indirectly identify populations that most characterize background. In this study, we analyze angular correlation between and matter distribution Universe as traced by gravitational lensing, leveraging more than decade...
RESUMO: A osteoporose é uma condição prevalente entre idosos, caracterizada pela redução da densidade mineral óssea e pelo aumento do risco de fraturas por fragilidade, especialmente em vértebras, quadril punho. Entre as vertebrais, mesmo traumas leves podem desencadear colapsos estruturais com desfechos dolorosos debilitantes. O tratamento suas complicações, como envolve estratégias terapêuticas cirúrgicas que ainda geram discussões quanto à sua eficácia, custo-benefício aplicabilidade...
We compare the measured angular cross-correlation between Fermi-LAT gamma-ray sky and catalogues of extra-galactic objects with expected signal induced by weakly interacting massive particle (WIMP) dark matter (DM). include a detailed description contribution astrophysical emitters such as blazars, misaligned AGN star forming galaxies, perform global fit to cross-correlation. Five are considered: SDSS-DR6 quasars, 2MASS NVSS radio SDSS-DR8 Luminous Red Galaxies main galaxy sample. To model...
Abstract We report the detection of a cross-correlation signal between Fermi Large Area Telescope diffuse γ -ray maps and catalogs clusters. In our analysis, we considered three different catalogs: WHL12, redMaPPer, PlanckSZ. They all show positive correlation with amplitudes, related to average mass objects in each catalog, which also sets catalog bias. The is confirmed by results stacking analysis. extends rather large angular scales, around 1°, that correspond, at typical redshift...