We study the Higgs boson decay into dark matter (DM) in the framework of freeze-in at stronger coupling. Even though the Higgs-DM coupling is significant, up to order one, DM does not thermalize due to the Boltzmann suppression of its production at low temperatures. We find that this mechanism leads to observable Higgs decay into invisible final states with the branching fraction of 10% and...
In this talk I will present a new potential signature of supernovae axion-like particles (ALPs) in neutrino water Cherenkov detectors. If ALPs couple to protons, then they can be detected through ALP absorption on free protons, $a\ p→p\ γ$, where the resulting photon has approximately the energy of the ALP. This new signature is complementary to the usual one from oxygen de-excitation, and...
Axion-like particles (ALPs) can account for the observed dark matter (DM) of the Universe and if their masses are at the eV scale, they can decay into
infrared, optical and ultraviolet photons
{with a decay lifetime larger than the age of the Universe}.
We analyze multi-wavelength data obtained from the central region of Messier 87 (M87) galaxy
by several telescopes, such as, Swift,...
The recent observations of solar $\rm ^8B$ neutrinos via coherent elastic neutrino–nucleus scattering (CEνNS) by the PANDAX-4T and XENONnT collaborations mark the first detection of the so-called “neutrino fog” — an irreducible background for future direct dark matter searches. In this talk, I will show how these results enable powerful new probes of light mediators coupling to neutrinos and...
Neutrinos from blazars can originate from inelastic scatterings between the protons within their jets and sub-GeV dark matter (DM) around them. I will show how this mechanism can potentially account for both the IceCube detections of neutrinos from the blazar TXS 0506+056, that are
otherwise challenging for astrophysical models of its jet, and also saturate the measured diffuse astrophysical...
We demonstrate the possibility of testing Heavy Neutral Leptons (HNLs) using "cosmic ray beam-dumps'' : setups where high-energy incident cosmic rays impinge on the Earth's atmosphere and then on the Earth's surface. We focus on HNL production from atmospherically produced parent meson decays, and examine them as a possible explanation of the appearing Cherenkov showers observed by the SHALON...
Axion-like particles (ALPs), theoretical extension of the QCD axion, are some of the numerous candidates for constituting dark matter. Several theoretical and experimental efforts aim to probe and constrain their properties, namely mass and potential coupling to standard model particles. Among these, assuming coupling with photons, the low-mass ALPs range, viz. m_{ALP} < 10^{-6} eV, could be...
The dark photon is a new gauge boson that naturally arises in many beyond the Standard Model theoretical models, featuring
interactions that resemble quantum electrodynamics. Due to this feature, it is often considered the portal between dark and visible
sectors. For this reason, it has become the target of many experimental searches worldwide. In this work, we propose a search for...
In this work, we apply recent direct detection constraints on electron recoils to freeze-in Dark Matter (DM) models. Due to recent results obtained by direct detection experiments, especially DAMIC-M, the dark photon scenario is severely constrained. However, there are different scenarios in which these bounds can be avoided. In freeze-in models, the scaling of the DM relic abundance allows...
Apart from its gravitational interactions, dark matter (DM) has remained so
far elusive in laboratory searches. One possible explanation is that the relevant interactions
to explain its relic abundance are mainly gravitational. In this work we consider an extra-
dimensional Randall-Sundrum scenario with a TeV-PeV IR brane, where the Standard
Model is located, and a GeV-TeV deep IR (DIR) one,...
