A5076529426- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Radioactive Decay and Measurement Techniques
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Functional Brain Connectivity Studies
- Particle accelerators and beam dynamics
- Astro and Planetary Science
- Advanced Electron Microscopy Techniques and Applications
- Antenna Design and Optimization
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Black Holes and Theoretical Physics
- Noncommutative and Quantum Gravity Theories
- Geophysics and Gravity Measurements
Universitat de València
2015-2024
Instituto de Física Corpuscular
2015-2024
Universitat Autònoma de Barcelona
2022
Institute for High Energy Physics
2022
University of Iowa
2018-2019
European Organization for Nuclear Research
2010-2019
Energy Center of Wisconsin
2019
University of Wisconsin–Madison
2019
Universitat de Barcelona
2019
Queen's University
2019
A prediction of the standard Λ cold dark matter cosmology is that (DM) haloes are teeming with numerous self-bound substructure or subhaloes. The precise properties these subhaloes represent important probes underlying cosmological model. We use data from Via Lactea II and Exploring Local Volume in Simulations N-body simulations to learn about structure masses 106–1011 h−1 M⊙. Thanks a superb subhalo statistics, we study as function distance host halo centre mass, provide set fits accurately...
A full energy and flavor-dependent analysis of the three-year high-energy IceCube neutrino events is presented. By means multidimensional fits, we derive current preferred values flavor ratios, normalization spectral index astrophysical fluxes, expected atmospheric background events, including a prompt component. crucial assumption resides on choice interval used for analyses, which significantly biases results. When restricting ourselves to $\ensuremath{\sim}30\text{ }\text{...
Dark matter and neutrinos provide the two most compelling pieces of evidence for new physics beyond Standard Model particle physics, but they are often treated as different sectors. The aim this paper is to determine whether there viable frameworks in which dark can be coupled active neutrinos. We use a simplified model approach all possible scenarios where such coupling study their astrophysical cosmological signatures. find that matter--neutrino interactions have an impact on structure...
The discoveries of a number binary black hole mergers by LIGO and VIRGO have reinvigorated the interest that primordial holes (PBHs) tens solar masses could contribute non-negligibly to dark matter energy density. Should even small population PBHs with $\ensuremath{\gtrsim}\mathcal{O}({M}_{\ensuremath{\bigodot}})$ exist, they profoundly impact properties intergalactic medium provide insight into novel processes at work in early Universe. We demonstrate here observations 21-cm transition...
Scatterings of galactic dark matter (DM) particles with the constituents celestial bodies could result in their accumulation within these objects. Nevertheless, finite temperature medium sets a minimum mass, evaporation that DM must have order to remain trapped. below this mass are very likely scatter speeds higher than escape velocity, so they would be kicked out capturing object and escape. Here, we compute for all spherical hydrostatic equilibrium, spanning range $[10^{-10} -...
A bstract Coherent elastic neutrino-nucleus scattering was first experimentally established five years ago by the COHERENT experiment using neutrinos from spallation neutron source at Oak Ridge National Laboratory. The evidence of observation coherent with reactor antineutrinos has now been reported Dresden-II experiment, a germanium detector. In this paper, we present constraints on variety beyond Standard Model scenarios new data. particular, explore imposed neutrino non-standard...
We present here a scenario, based on low reheating temperature T(R)<<100 MeV at the end of (the last episode of) inflation, in which coupling sterile neutrinos to active can be as large experimental bounds permit (thus making this neutrino "visible" future experiments). In previous models was forced very small prevent cosmological overabundance neutrinos. Here abundance depends how is. For example, required by Liquid Scintillator Neutrino Detector result may not have any problem within our scenario.
We present a scenario in which remarkably simple relation linking dark matter properties and neutrino masses naturally emerges. This framework points towards low energy theory where the mass originates from existence of light scalar particle keV-MeV range. discuss different ways to constrain test this by means astrophysical cosmological observations as well laboratory experiments. Finally, we point out that one interesting aspect is implied range compatible with required for explanation...
The IceCube experiment has recently reported the observation of 28 high-energy (> 30 TeV) neutrino events, separated into 21 showers and 7 muon tracks, consistent with an extraterrestrial origin. In this letter we compute compatibility such possible combinations flavors relative proportion (alpha_e:alpha_mu:alpha_tau). Although 7:21 track-to-shower ratio is naively favored for canonical (1:1:1) at Earth, not true once atmospheric backgrounds are properly accounted for. We find that,...
We use the latest cosmic microwave background (CMB) observations to provide updated constraints on dark matter lifetime as well p-wave suppressed annihilation cross sections in 1 MeV TeV mass range. In contrast scenarios with an s-wave dominated section, which mainly affect CMB close last scattering surface, signatures associated these essentially appear at low redshifts ($z \lesssim 50$) when structure began form, and thus manifest lower multipoles power spectrum. data from Planck, WMAP9,...
Annihilation of dark matter particles accumulated in the Sun would produce a flux high-energy neutrinos whose prospects detection neutrino telescopes and detectors have been extensively discussed literature. However, for annihilations into Standard Model particles, there also be MeV range from decays at rest muons positively charged pions. These low-energy never considered before they open possibility to constrain annihilation e+e−, μ+μ− or light quarks. Here we perform detailed analysis...
Future dedicated radio interferometers, including HERA and SKA, are very promising tools that aim to study the epoch of reionization beyond via measurements 21 cm signal from neutral hydrogen. Dark matter (DM) annihilations into charged particles change thermal history Universe and, as a consequence, affect signal. Accurately predicting effect DM strongly relies on modeling inside halos. In this work, we use up-to-date computations energy deposition rates by products annihilations, proper...
In view of the IceCube's 6-year high-energy starting events (HESE) sample, we revisit possibility that updated data may be better explained by a combination neutrino fluxes from dark matter decay and an isotropic astrophysical power-law than purely latter. We find combined two-component flux qualitatively improves fit to observed over one, discuss how these fits compare against similar analysis done with 4-year HESE data. also update involving via multiple channels, without any contribution...
If dark matter (DM) is unstable, in order to be present today, its lifetime needs longer than the age of Universe, t_U ~ 4 10^{17} s. It usually assumed that if DM decays it would do with some strength through a radiative mode. In this case, very constraining limits can obtained from observations diffuse gamma ray background. However, although reasonable, model-dependent assumption. Here our only assumption into, at least, one Standard Model (SM) particle. Among these, neutrinos are least...
Light sterile neutrinos might mix with the active ones and be copiously produced in early Universe. In present paper, a detailed multi-flavor analysis of neutrino production is performed. Making some justified approximations allows us to consider not only interactions primeval medium coherence breaking effects, but also oscillation effects arising from presence three light (mostly-active) states mixed two heavier (mostly-sterile) states. First, we emphasize underlying physics via an...
MeV particles have been advocated as dark matter (DM) candidates in different contexts. This hypothesis can be tested indirectly by searching for the standard model (SM) products of DM self-annihilations. As signal from self-annihilations depends on square density, we might expect a sizable flux annihilation our galaxy. Neutrinos are least detectable SM and null this channel would allow to set most conservative bound total cross section. Here, show that neutrino detectors with good energy...
It is commonly assumed that the cosmological and astrophysical bounds on mixings of sterile with active neutrinos are much more stringent than those obtained from laboratory measurements. We point out in scenarios a very low reheating temperature MeV at end (the last episode of) inflation or entropy creation, abundance becomes greatly suppressed respect to within standard framework. Thus, this case become less usually assumed, allowing be 'visible' future experiments. Here, we concentrate...
After four years of data taking, the IceCube neutrino telescope has detected 54 high-energy starting events (HESE, or contained-vertex events) with deposited energies above 20TeV. They represent first ever detection extraterrestrial neutrinos and therefore, step in astronomy. In order to study energy, flavor isotropy astrophysical flux arriving at Earth, we perform different analyses two energy intervals, [10 TeV $-$ 10 PeV] [60 PeV]. We consider an isotropic unbroken power-law spectrum...
Scalar (fermion) dark matter with mass in the MeV range coupled to ordinary neutrinos and another fermion (scalar) is motivated by scenarios that establish a link between radiatively generated neutrino masses relic density. With such coupling, cosmic supernova neutrinos, on their way us, could resonantly interact background particles, giving rise dip redshift-integrated spectra. Current future detectors, as Super-Kamiokande, LENA Hyper-Kamiokande, be able detect this distortion.
The elastic scattering between dark matter particles and radiation represents an attractive possibility to solve a number of discrepancies observations standard cold predictions, as the induced collisional damping would imply suppression small-scale structures. We consider this scenario confront it with measurements ionization history Universe at several redshifts recent estimates counts Milky Way satellite galaxies. derive conservative upper bound on matter-photon cross section σγ DM < 8 ×...
Within the standard propagation scenario, flavor ratios of high-energy cosmic neutrinos at neutrino telescopes are expected to be around democratic benchmark resulting from hadronic sources, $\left( 1 : \right)_\oplus$. We show how coupling an ultralight dark matter complex scalar field would induce effective mass that could lead adiabatic propagation. This result in preservation detector production composition sources. effect detectors well outside range predicted by scenario averaged...