In the Standard Model a Dark Matter candidate is missing, but it is relatively simple to enlarge the model including one or more suitable particles.
We consider in this paper one such extension, inspired by simplicity and by the goal to solve more than just the Dark Matter issue.
Indeed we consider a local $U(1) $ extension of the SM providing an axion particle to solve the strong CP...
Most analyses and interpretations of current high-quality data from the Fermi Large Area Telescope, especially in the Galactic center, highly rely on large-scale interstellar models of the diffuse emission, which are very uncertain. To complicate the picture, most of the current models officially used to analyze Fermi-LAT diffuse data usually do not take advantage of important constraints...
I n this dissertation we intend to study the background related to the memory effect that leads to "gravitational-wave memory effect" and two types of memory effect:(1) We intend to study a whole outline of what is memory effect.(2) We intend to solve the linear memory for N Gravitationally Unbound Particles where we will study different kinds of spherical harmonics,
mass quadrapole leading...
Axion-like particles (ALPs) and other feebly interacting particles (FIPs) at sub-GeV scales has generated a lot of interest in the recent years.
Stars are good FIPs factories and consequently can be detected through their interaction with the interstellar matter or decay in standard particles. Many sources are taken as target, such as the sun and SNe.
I will illustrate how high-energy...
The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratories studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions. ICARUS performed a sensitive search for LSND-like anomalous νe appearance in the CNGS beam, which contributed to the constraints on the...
The ICECUBE , ice cube km neutrino detector at South Pole, and its high energy starting events (HESE), either cascades (spherical shower) or longest muon tracks, well above several tens TeV or hundred TeV edges, had been claimed since 2013 to be the signature of a very possible Neutrino Astronomy. This new discover was not based on any neutrino self correlations, nor to any event clustering...
As Stage IV large-volume surveys are expected to reach an exquisite sub-percent level of statistical accuracy and precision in cosmological measurements, an accurate modeling of the dark sector is needed in order to obtain reliable likelihoods and unbiased cosmological parameters. This is particularly true at high-redshift and at small scales, where baryonic physics and feedback mechanisms can...
The discrimination of nuclear recoils (NR) possibly induced by dark matter (DM) particles from the electronic recoils (ER) induced by the ordinary matter particles is one of the main experimental challenges of direct DM searches in the ${\rm GeV}/c^2$ mass region. Gaseous Time Projection Chambers (TPCs) with optical readout are a promising and innovative technique: the high granularity of the...
More than 10 years ago, an excess of $\gamma$-ray photons coming from the Galactic center was discovered in the Fermi-LAT data. First attributed to dark matter, it has since been shown that it should have at least a partial stellar origin. One intereseting explanation to the excess is the presence of a population of millisecond pulsars (MSPs) confined in the Galactic bulge. While unresolved in...
Galactic diffuse emission in the MeV-GeV energy band is mostly contributed by the interaction of cosmic-ray (CR) nuclei with the dense interstellar medium (ISM). Observations of this radiation bring priceless information regarding the spatial and spectral distribution of CRs in the Galaxy far from the Solar System. Fermi-LAT observations of large-scale emission and of molecular clouds unveiled...
We present the morphological and spectral analysis of Fermi-LAT data of the middle-aged supernova remnant (SNR) W44 and the massive molecular gas complex that surrounds it. The derived spectral energy distribution of the SNR, derived over three decades is improved, with respect to previous observations, both at low (< 100 MeV) and at higher energies (> 100 GeV) allowing us to...
Over the past decades, theories have predicted the existence of heavy compact objects containing an extremely dense form of exotic matter named Strange Quark Matter (SQM). This type of hypothetical matter is composed of nearly equal quantities of up, down and strange quarks and is supposed to be the ground state of Quantum Chromodynamics. Nuclearites are the massive component of SQM particles....
We present an innovative mission concept that builds upon the heritage of past and current missions improving the sensitivity and, very importantly, the angular resolution. This consists in combining a Compton telescope and a coded-mask telescope. The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO) is a novel concept for a next-generation telescope covering hard X-ray...
The Scintillating Bubble Chamber Collaboration (SBC) is developing a liquid-noble detector ideal for GeV-mass WIMP searches and coherent elastic neutrino-nucleus scattering (CE$\nu$NS) detection. The detector is now being commissioned at Fermilab and consists of a 10-kg bubble chamber using liquid argon with the potential to reach and maintain sub-keV energy thresholds. This detector will...
The PICO-60 C3F8 dark matter detector was a bubble chamber consisting of a fused silica inner vessel filled with 52 kg of C$_3$F$_8$ in a superheated state operating at 2.45-keV and 3.29-keV thermodynamic thresholds, reaching exposures of 1404-kg-day and 1167-kg-day, respectively. This bubble chamber was operated two km deep underground at SNOLAB, in Sudbury, Ontario in Canada. These two...
Interactions between secondary cosmic rays and nuclei in natural minerals can cause nuclear recoils that leave tracks in the material structure. Such defects, which can also be caused by other astroparticles, can be preserved for up to some Gyr, making these useful “time machines” for the study of the history of astrophysical messengers. These so-called "Paleo-detectors" have been proposed as...
The strong constraints from the Fermi-LAT data on the isotropic gamma-ray background suggest that the neutrinos observed by IceCube might possibly come from sources that are hidden to gamma-ray observations. A possibility emerged in recent years is that neutrinos may come from jets of collapsing massive stars which fail to break out of the stellar envelope, and for this reason they are known...
