380 citations · 1.9k across the 18 of their papers we have counts for
18 papers
Supernova pointing with low- and high-energy neutrino detectors
R. Tomas, D. Semikoz, G. G. Raffelt +2
A future galactic SN can be located several hours before the optical explosion through the MeV-neutrino burst, exploiting the directionality of --scattering in a water Cheren…
Extraction of cluster parameters with future Sunyaev-Zel'dovich observations
Nabila Aghanim, Steen H. Hansen, Sergio Pastor +1
The Sunyaev-Zel'dovich (SZ) effect of galaxy clusters is characterized by three parameters: Compton parameter, electron temperature and cluster peculiar velocity. In the present st…
First measurement of cluster temperature using the thermal Sunyaev-Zeldovich effect
Steen H. Hansen, Sergio Pastor, Dmitry V. Semikoz
We discuss a new method of finding the cluster temperatures which is independent of distance and therefore very useful for distant clusters. The hot gas of electrons in clusters of…
Cosmological bounds on neutrino degeneracy improved by flavor oscillations
A. D. Dolgov, S. H. Hansen, S. Pastor +3
We study three-flavor neutrino oscillations in the early universe in the presence of neutrino chemical potentials. We take into account all effects from the background medium, i.e.…
Physics of Synchronized Neutrino Oscillations Caused by Self-Interactions
S. Pastor, G. G. Raffelt, D. V. Semikoz
In the early universe or in some regions of supernovae, the neutrino refractive index is dominated by the neutrinos themselves. Several previous studies have found numerically that…
Axion-like particles as ultra high energy cosmic rays?
D. S. Gorbunov, G. G. Raffelt, D. V. Semikoz
If Ultra High Energy Cosmic Rays (UHECRs) with E>4 10^{19} eV originate from BL Lacertae at cosmological distances as suggested by recent studies, the absence of the GZK cutoff can…
Standard Model Neutrinos as Warm Dark Matter
Gian F. Giudice, Edward W. Kolb, Antonio Riotto +2
Standard Model neutrinos are not usually considered plausible dark matter candidates because the usual treatment of their decoupling in the early universe implies that their mass m…
Spectral distortion of cosmic background radiation by scattering on hot electrons. Exact calculations
A. D. Dolgov, S. H. Hansen, S. Pastor +1
The spectral distortion of the cosmic background radiation produced by the inverse Compton scattering on hot electrons in clusters of galaxies (thermal Sunyaev-Zeldovich effect) is…
Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe
R. Buras, D. V. Semikoz
A large lepton asymmetry could be generated in the Early Universe by oscillations of active to sterile neutrinos with a small mixing angle sin 2 θ< 10^-2. The final order of magnit…
Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A
A. D. Dolgov, S. H. Hansen, G. Raffelt +1
Cosmological and astrophysical effects of heavy (10 - 200 MeV) sterile Dirac neutrinos, mixed with the active ones, are considered. The bounds on mass and mixing angle from both su…
Cosmological and astrophysical bounds on a heavy sterile neutrino and the KARMEN anomaly
A. D. Dolgov, S. H. Hansen, G. Raffelt +1
Constraints on the lifetime of the heavy sterile neutrino, that was proposed as a possible interpretation of the KARMEN anomaly, are derived from primordial nucleosynthesis and SN…
Neutrino oscillations in the early universe: How large lepton asymmetry can be generated?
A. D. Dolgov, S. H. Hansen, S. Pastor +1
The lepton asymmetry that could be generated in the early universe through oscillations of active to sterile neutrinos is calculated (almost) analytically for small mixing angles,…
Unstable massive tau-neutrinos and primordial nucleosynthesis
A. D. Dolgov, S. H. Hansen, S. Pastor +1
The impact of unstable Majorana tau neutrinos on primordial nucleosynthesis is considered. The mass and lifetime of nu_tau are taken in the intervals 0.1-20 MeV and 0.001-400 sec r…
Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe - Addendum
A. D. Dolgov, S. H. Hansen, D. V. Semikoz
We repeat our previous calculation of the spectrum distortion of massless neutrinos in the early universe with a considerably better accuracy and corrected for a missing numerical…
Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations
A. D. Dolgov, S. H. Hansen, D. V. Semikoz
The influence of a massive Majorana tau-neutrino on primordial nucleosynthesis is rigorously calculated. The system of three integro-differential kinetic equations is solved numeri…
Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe
A. D. Dolgov, S. H. Hansen, D. V. Semikoz
Distortion of the equilibrium spectra of cosmic neutrinos due to interaction with hotter electrons and positrons in the primeval cosmic plasma is considered. The set of integro-dif…
Condensation of bosons in kinetic regime
D. V. Semikoz, I. I. Tkachev
We study the kinetic regime of the Bose-condensation of scalar particles with weak self-interaction. The Boltzmann equation is solved numerically. We consider two kinetic st…
Kinetics of Bose-Condensation
D. Semikoz, I. Tkachev
The process of condensation in the system of scalar Bosons with weak interaction is considered. Boltzmann kinetic equation is solved numerically. Bose condensation proceeds…