A5042228727- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Noncommutative and Quantum Gravity Theories
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- High-Energy Particle Collisions Research
- Relativity and Gravitational Theory
- Radioactive Decay and Measurement Techniques
- Nuclear physics research studies
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Space Science and Extraterrestrial Life
- Advanced NMR Techniques and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2008-2023
University of L'Aquila
2013-2023
Istituto Nazionale di Fisica Nucleare
2009-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
1992-2005
Georgian National Academy of Sciences
1993-2002
Tbilisi State University
2002
University of Lisbon
2000
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2000
University of Padua
2000
University of Ferrara
1994-1998
We suggest that recent neutrino puzzles are the solar and atmospheric deficits as well possible oscillations reported by LSND experiment possibility of massive neutrinos providing hot component cosmological dark matter, can all be naturally explained assuming existence a mirror world described an ``electroweak'' gauge symmetry $[SU(2)\times U(1)]'$, with breaking scale larger about factor 30 than standard $SU(2)\times U(1)$ model. An interesting aspect this model is sterile arise from hidden...
We discuss the phenomenological implications of neutron (n) oscillation into mirror (n'), a hypothetical particle exactly degenerate in mass with but sterile to normal matter. show that present experimental data allow maximal n-n' vacuum characteristic time $\tau$ much shorter than lifetime, fact as small 1 sec. This phenomenon may manifest disappearance and regeneration experiments perfectly accessible capabilities also have interesting astrophysical consequences, particular for propagation...
We show that emerging tension between the direct astronomical measurements at low redshifts and cosmological parameters deduced from Planck of CMB anisotropies can be alleviated if dark matter consists two fractions, stable part being dominant a smaller unstable fraction. The latter constitutes $\sim 10$ per cent recombination epoch decays by now.
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
Abstract The field of particle physics is at the crossroads. discovery a Higgs-like boson completed Standard Model (SM), but lacking observation convincing resonances Beyond SM (BSM) offers no guidance for future physics. On other hand, motivation New Physics has not diminished and is, in fact, reinforced by several striking anomalous results many experiments. Here we summarise status most significant anomalies, including recent flavour multi-lepton anomalies LHC, excess around 96 GeV,...
We propose a model to explain how Gamma Rays Burst can take place days or years after supernova explosion. Our is based on the conversion of pure hadronic star (neutron star) into made at least in part deconfined quark matter. The process be delayed if surface tension interface between and deconfined-quark-matter phases taken account. nucleation time (i.e. form critical-size drop matter) extremely long mass small. Via accretion dramaticaly reduced finally converted stable configuration. A...
We discuss gravitationally induced masses and mass splittings of Majorana, Zeldovich-Konopinski-Mahmoud, Dirac neutrinos. Among other implications, these effects can provide a solution the solar neutrino puzzle. In particular, we show how this may work in 17 keV picture.
We briefly review the concept of a parallel 'mirror' world which has same particle physics as observable and couples to latter by gravity perhaps other very weak forces. The nucleosynthesis bounds demand that mirror should have smaller temperature than ordinary one. By this reason its evolution substantially deviate from standard cosmology far crucial epochs like baryogenesis, etc. are concerned. In particular, we show in context certain baryogenesis scenarios, baryon asymmetry be larger...
Abstract After the recent high precision determinations of $$V_{us}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>us</mml:mi></mml:mrow></mml:msub></mml:math> and $$V_{ud}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>ud</mml:mi></mml:mrow></mml:msub></mml:math> , first row CKM matrix shows more than $$4\sigma $$...
The DAMA experiment using ultra low background NaI(Tl) crystal scintillators has measured an annual modulation effect in the keV region which satisfies all peculiarities of induced by Dark Matter particles. In this paper we analyze terms mirror Matter, exact duplicate ordinary matter from parallel hidden sector, chemical composition is dominated helium while it can also contain significant fractions heavier elements as Carbon and Oxygen. atoms are considered to interact with target nuclei...
Recent high precision determinations of $V_{us}$ and $V_{ud}$ indicate towards anomalies in the first row CKM matrix. Namely, determination from superallowed beta decays kaon imply a violation unitarity at about $4\sigma$ level. Moreover, there is tension between obtained leptonic $K\mu2$ semileptonic $K\ell3$ decays. These discrepancies can be explained if exist extra vector-like quarks TeV scale, which have large enough mixings with lighter quarks. In particular, weak singlets thought as...
We propose a leptobaryogenesis mechanism in which the nonzero B-L of Universe is produced out-of-equilibrium, lepton number and CP-violating scattering processes that convert ordinary particles into some hidden sector. In particular, we consider l phi-->l(')phi('),l macro(')phi(') mediated by heavy Majorana neutrinos N seesaw mechanism, where phi are Higgs doublets l('), phi(') their counterparts. Such leptogenesis effective even if reheat temperature much smaller than neutrino masses. it...
In the mirror world hypothesis, baryonic component emerges as a possible dark matter candidate. An immediate question arises: how do baryons behave and what are their differences from more familiar candidates such cold matter? this paper, we answer quantitatively. First, discuss dependence of relevant scales for structure formation (Jeans Silk scales) on two macroscopic parameters necessary to define model: temperature plasma (limited by Big Bang Nucleosynthesis) amount matter. Then perform...
Theories with an extra spin-two field coupled to gravity admit a massive phase broken Lorentz symmetry. While the equivalence principle is respected, Newtonian potentials are in general modified, but they may be protected by scale symmetry of coupling term. The gravitational waves phenomenology quite rich: two gravitons, one and massless, oscillate propagate distinct velocities, different from speed light. A time flight difference between gravitons photons common source would provide clear...