A5021361961- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Anesthesia and Sedative Agents
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- Lung Cancer Diagnosis and Treatment
- Colorectal Cancer Screening and Detection
- Neutrino Physics Research
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
Fermi National Accelerator Laboratory
2022-2025
University of Chicago
2022-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2020-2023
Laboratoire de Physique Théorique et Hautes Energies
2020-2023
Sorbonne Université
2020-2023
Centre National de la Recherche Scientifique
2021-2023
University of Turin
2020-2022
Instituto de Física de Cantabria
2021
University of Padua
2010
Dark matter particles with a mass around 1 eV can decay into near-infrared photons. Utilizing available public blank sky observations from the NIRSpec IFU on James Webb Space Telescope (JWST), we search for narrow emission line due to decaying dark and derive leading constraints in range 0.8-3 rate photons, more specifically, axion-photon coupling case of axionlike particles. We exclude τ<3.5×10^{26} s at m_{DM}≃0.8 and, axions, g_{aγγ}>1.3×10^{-11} GeV^{-1} m_{a}≃2.2 eV. Our results do not...
Abstract Sub-GeV dark matter particles can annihilate or decay producing e ± pairs which upscatter the low-energy photon fields in Galaxy and generate an X-ray emission (via Inverse Compton effect). Using X -ray data from Xmm-Newton , Integral NuStar Suzaku we derive new constraints on this class of (DM). In annihilation case, our bounds are strongest available for DM masses above 180 MeV, reaching 〈 σv 〉 ≲ 10 -28 cm 3 /s m ≃ 1 GeV. to date over a large fraction considered mass range,...
Light dark matter (DM), defined here as having a mass between 1 MeV and about GeV, is an interesting possibility both theoretically phenomenologically, at one of the frontiers current progress in field DM searches. Its indirect detection via gamma rays challenged by scarcity experiments MeV--GeV region. We look therefore lower-energy x-ray data from INTEGRAL telescope, compare them with predicted flux. derive bounds which are competitive existing ones other techniques. Crucially, we include...
Diffuse filaments connect galaxy clusters to form the cosmic web. Detecting these could yield information on magnetic field strength, ray population and temperature of intercluster gas, yet, faint large-scale nature bridges makes direct detections very challenging. Using multiple independent all-sky radio X-ray maps we stack pairs luminous red galaxies as tracers for cluster pairs. For first time, detect an average surface brightness between from synchrotron (radio) thermal (X-ray) emission...
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...
Thermal relic dark matter below <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo>∼</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>GeV</a:mi></a:mrow></a:math> is excluded by cosmic microwave background data if its annihilation to visible particles unsuppressed near the epoch of recombination. Usual model-building measures avoid this bound involve kinematically suppressing rate in low-velocity limit, thereby yielding dim prospects for...
If primordial black holes (PBHs) contribute more than 10% of the dark matter (DM) density, their energy density today is same order as that baryons. Such a cosmic coincidence might hint at mutual origin for formation scenario PBHs and baryon asymmetry Universe. Baryogenesis can be triggered by sharp transition rolling rate inflaton from slow-roll to (nearly) ultraslow-roll phases produce large curvature perturbations PBH in single-field inflationary models. We show baryogenesis requirement...
In the next decade, proposed Line Emission Mapper (LEM) telescope concept is poised to revolutionize Galactic and extragalactic x-ray sensitivity. The instruments aboard LEM feature unprecedented eV scale energy resolution an effective area of $1600\text{ }\text{ }{\mathrm{cm}}^{2}$ at 0.5 keV. Such features are ideally suited explore decaying dark matter candidates that predict X-ray signals, including axion-like particles sterile neutrinos. We present first forecast sensitivity decays find...
IceCube has recently reported the detection of $\sim 1-10 \,{\rm TeV}$ neutrinos from nearby active galaxy, NGC 1068. The lack TeV-scale emission this source suggests that these are generated in dense corona surrounds 1068's supermassive black hole. In paper, we present a physical model for source, including processes pair production, pion synchrotron, and inverse Compton scattering. We have also performed new analysis Fermi-LAT data direction 1068, finding gamma-ray is very soft but bright...
Achieving the target of 95% colonoscopy completion rate at centres conducting colorectal screening programs is an important issue. Large and teaching hospitals employing endoscopists with different levels training expertise risk achieving worse results. Deep sedation propofol in routine could maximize results cecal intubation. The present study on experience a single centre focused estimating overall colonoscopies performed under large hospital many operators involved, assessing factors that...
Abstract We analyze the angular power spectrum (APS) of unresolved gamma-ray background (UGRB) emission and combine it with measured properties resolved sources Fermi-LAT 4FGL catalog. Our goals are to dissect composition sky establish relevance different classes source populations active galactic nuclei in determining observed size UGRB anisotropy, especially at low energies. find that, under physical assumptions for spectral energy distribution, i.e., by using catalog data as a prior, two...
Dark matter particles with a mass around 1 eV can decay into near-infrared photons. Utilising available public blank sky observations from the NIRSpec IFU on James Webb Space Telescope (JWST), we search for narrow emission line due to decaying dark and derive leading constraints in range 0.8-3 rate photons, more specifically, axion-photon coupling case of axion-like particles. We exclude $\tau < 6.7\cdot 10^{26}$ s at $m_{\rm DM} \simeq 0.9$ and, axions, $g_{a \gamma \gamma} > 9.4 \cdot...
The search for a particle dark matter signal in terms of radiation produced by annihilation or decay has to cope with the extreme faintness predicted and presence masking astrophysical backgrounds. It been shown that using correlated information between distribution Universe fluctuations cosmic fields potential allow setting apart pure from emissions, since spatial field due sources emission have different features. cross-correlation technique proposed adopted studies looking at halos...
The unresolved gamma-ray background (UGRB) is a diffuse emission arising from numerous extragalactic sources below the detection threshold and an important component of sky. Studying UGRB crucial for understanding high-energy astrophysical processes in universe probing fundamental physics, such as nature dark matter. In this work, we forecast cross-correlation between galaxy catalogs Dark Energy Spectroscopic Instrument (DESI) survey. First, study expected contributions to their with DESI...
Neutral hydrogen (HI) intensity mapping traces the large-scale distribution of matter in Universe and therefore should correlate with gamma-ray emission originated from particle dark annihilation or active galactic nuclei star-forming galaxies, since related processes occur same cosmic structures hosting HI. In this paper, we derive cross-correlation signal between brightness temperature 21-cm line HI spin-flip transition unresolved background. Specifically, forecasts for by focussing on...
In this work we proposed to constrain sub-GeV dark matter particles (1 MeV $\leq$ m$_\textrm{DM}$ 5 GeV) by looking at energies much lower than the mass range of interest, means inverse Compton scattering contribution total flux. particular, electrons and positrons produced give rise X rays up-scattering low-energy photons in Milky Way, notably cosmic microwave background, infrared light from dust optical starlight. These fall energy covered {\sc Integral} data, which used annihilation...
Abstract The goal of this work is to constrain sub-GeV dark matter particles (1 MeV ≤ m DM 5 GeV) by looking at photons in the keV energy range and including inverse Compton scattering contribution total flux. In particular, electrons positrons produced can scatter low-energy Milky Way up X-ray energies. These X rays are probed I ntegral data, which we utilised annihilation cross-section. relevant channels electron, muon pion. As a result, derived competitive bounds for with mass between 150 1.5 GeV.
We present bounds on dark matter (DM) in the MeV to GeV mass range, obtained by using X-ray measurements from INTEGRAL telescope.A crucial element, which allows us derive competitive or stronger than existing ones other techniques, resides inclusion of contribution inverse Compton scattering galactic radiation fields and CMB.This is based [1], we refer for additional details.
In the next decade, proposed Line Emission Mapper (LEM) telescope concept is poised to revolutionize Galactic and extragalactic X-ray sensitivity. The instruments aboard LEM feature unprecedented eV scale energy resolution an effective area of 1600 cm$^2$ at 0.5 keV. Such features are ideally suited explore decaying dark matter candidates that predict signals, including axion-like particles sterile neutrinos. We present first forecast sensitivity decays find lifetimes beyond $\sim 10^{32}$ s...
Thermal relic dark matter below $\sim 10 \ \text{GeV}$ is excluded by cosmic microwave background data if its annihilation to visible particles unsuppressed near the epoch of recombination. Usual model-building measures avoid this bound involve kinematically suppressing rate in low-velocity limit, thereby yielding dim prospects for indirect detection signatures at late times. In work, we investigate a class cosmologically-viable sub-GeV thermal relics with late-time rates that are detectable...
Pulsars are observed to emit bright and spatially extended emission at multi-TeV energies. Although such "TeV halos" appear be an approximately universal feature of middle-aged pulsars, there remains much understood about these systems. In this paper, we project the ability Cherenkov Telescope Array (CTA) measure properties TeV halos, focusing on case nearby Geminga pulsar. We conclude that CTA will able provide important information source, allowing us discriminate between a range different...
Abstract In this work we derive the first theoretical prediction of cross-correlation signal between unresolved gamma-ray background and 21-cm line originated by spin-flip transition neutral hydrogen atoms, taking as benchmark experiment space telescope Fermi-LAT for gamma rays next-generation radio Square Kilometer Array (SKA) well its precursor MeerKAT emission. The attainable bounds in dark matter (DM) parameter are envisioned to be competitive already with combination × MeerKAT, but SKA...