Introduction to Cosmology (2009)
An introductory lectures on cosmology at ITEP Winter School for students specializing in particle physics are presented. Many important subjects are not covered because of lack of time and space but...
CPT violation and particle-antiparticle asymmetry in cosmology (2009)
General features of generation of the cosmological charge asymmetry in CPT non-invariant world are discussed. If the effects of CPT violation manifest themselves only in mass differences of particles...
Baryogenesis and cosmological antimatter (2009)
Possible mechanisms of baryogenesis are reviewed. Special attention is payed to those which allow for creation of astronomically significant domains or objects consisting of antimatter. Observational...
Cosmic antimatter: models and observational bounds (2008)
A model which leads to abundant antimatter objects in the Galaxy (anti-clouds, anti-stars, etc) is presented. Observational manifestations are analyzed. In particular, the model allows for all...
Inhomogeneous baryogenesis, cosmic antimatter, and dark matter (2008)
Dolgov, A. D., Kawasaki, M., Kevlishvili, N.
A model of inhomogeneous baryogenesis based on the Affleck and Dine mechanism is described. A simple coupling of the scalar baryon field to the inflaton allows for formation of astronomically...
Cosmology and Neutrino Properties (2008)
This is a brief review for particle physicists on cosmological impact of neutrinos and on restrictions on neutrino properties from cosmology. The paper includes discussion of upper bounds on neutrino...
Dynamical vacuum energy via adjustment mechanism (2008)
A new mechanism of adjustment of vacuum energy down to the observed value from an initially huge one is considered. The mechanism is based on a very strong variation of the gravitational coupling...
Cosmological Charge Asymmetry and Rare Processes in Particle Physics (2007)
Two scenarios of low temperature baryogenesis in theories with TeV scale gravity are discussed. It is argued that strong gravity at TeV energies is very favorable for baryogenesis. In both scenarios...
Statistics of neutrinos and the double beta decay (2007)
Barabash, A. S., Dolgov, A. D., Dvornicky, R., Simkovic, F., Smirnov, A. Yu.
We assume that the Pauli exclusion principle is violated for neutrinos, and thus, neutrinos obey at least partly the Bose-Einstein statistics. The parameter sin^2 chi is introduced that characterizes...
Baryogenesis from gravitational decay of TeV particles in theories with low scale gravity (2007)
Bambi, C, Dolgov, A D, Freese, K
In models with the fundamental gravity scale in the TeV range, early cosmology is quite different from the standard picture, because the universe must have arisen at a much lower temperature and the...
Antimatter in the Milky Way (2007)
Observational signatures of existence of antimatter objects in the Galaxy are discussed. We focus on point-like sources of gamma radiation, diffuse galactic gamma ray background and anti-nuclei in...
Baryogenesis from Gravitational Decay of TeV-Particles in Theories with Low Scale Gravity (2006)
Bambi, C., Dolgov, A. D., Freese, K.
In models with the fundamental gravity scale in the TeV range, early cosmology is quite different from the standard picture, because the universe must have arisen at a much lower temperature and the...
A Black Hole Conjecture and Rare Decays in Theories with Low Scale Gravity (2006)
Bambi, C., Dolgov, A. D., Freese, K.
In models with large extra dimensions, where the fundamental gravity scale can be in the electroweak range, gravitational effects in particle physics may be noticeable even at relatively low...
Cosmology and New Physics (2006)
A comparison of the standard models in particle physics and in cosmology demonstrates that they are not compatible, though both are well established. Basics of modern cosmology are briefly reviewed....
Baryogenesis by R-parity violating top quark decays and neutron-antineutron oscillations (2006)
Generation of the cosmological baryon asymmetry in SUSY based model with broken R-parity and low scale gravity is considered. The model allows for a long-life time or even stable proton and...
CP violation in cosmology (2005)
Cosmological implications of asymmetry between particles and antiparticles are reviewed. Three possible mechanisms of CP-violation in cosmology are described. General features of kinetics of...
Neutrino wave function and oscillation suppression (2005)
Dolgov, A. D., Lychkovskiy, O. V., Mamonov, A. A., Okun, L. B., Schepkin, M. G.
We consider a thought experiment, in which a neutrino is produced by an electron on a nucleus in a crystal. The wave function of the oscillating neutrino is calculated assuming that the electron is...
Oscillations of neutrinos produced and detected in crystals (2005)
Dolgov, A. D., Lychkovskiy, O. V., Mamonov, A. A., Okun, L. B., Rotaev, M. V., Schepkin, M. G.
We analyze neutrino oscillations in a thought experiment in which neutrinos are produced by electrons on target nuclei. The neutrinos are detected through charged lepton production in their collision...
Evaporation of charged bosonic condensate in cosmology (2005)
Cosmological evolution of equilibrium plasma with a condensate of U(1)-charged bosonic field is considered. It is shown that the evaporation of the condensate is very much different from naive...
Neutrino, Cosmos, and New Physics (2005)
Observational manifestations of possible breaking of spin-statistics relation for neutrinos are considered. It is argued that bosonic neutrinos may form cosmological cold dark matter, improve...
Neutrino statistics and big bang nucleosynthesis (2005)
Dolgov, A. D., Hansen, S. H., Smirnov, A. Yu.
Neutrinos may possibly violate the spin-statistics theorem, and hence obey Bose statistics or mixed statistics despite having spin half. We find the generalized equilibrium distribution function of...
Cosmological Magnetic Fields and CMBR Polarization (2005)
A simple introduction to physics of CMBR polarization and the Faraday rotation of the latter in cosmic magnetic field is presented. The content of the lecture is the following: 1. Description of...
Dolgov, A. D., Smirnov, A. Yu.
We assume that the Pauli exclusion principle is violated for neutrinos, and consequently, neutrinos obey the Bose-Einstein statistics. Cosmological and astrophysical consequences of this assumption...
Big Bang and Heavy Particles (2004)
A possibility of existence of ultra-heavy (quasi)stable particles, mechanisms leading to their large life-time, their production in the early universe, and cosmological manifestations are reviewed.
Suppressed neutrino oscillations and large lepton asymmetries (2004)
Dolgov, A. D., Takahashi, Fuminobu
It is shown that hypothetical neutrino-majoron coupling can suppress neutrino flavor oscillations in the early universe, in contrast to the usual weak interaction case. This reopens a window for a...
Oscillations of neutrinos produced by a beam of electrons (2004)
Dolgov, A. D., Okun, L. B., Rotaev, M. V., Schepkin, M. G.
We analyze a thought neutrino oscillation experiment in which neutrinos are produced by electrons colliding with atomic nuclei of a target. The neutrinos are detected by observing charged leptons,...
Campanelli, L., Dolgov, A. D., Giannotti, M., Villante, F. L.
Measurements of the Faraday rotation of the cosmic microwave background radiation (CMBR) polarization could provide evidence for the existence of primordial magnetic fields. The Faraday rotation...
Problems of vacuum energy and dark energy (2004)
A simple description of the vacuum energy (cosmological constant) problem for non-experts is presented. Basic features of cosmology with non-zero vacuum energy are discussed. The astronomical data...
Do neutrino flavor oscillations forbid large lepton asymmetry of the universe ? (2004)
Dolgov, A. D., Takahashi, Fuminobu
It is shown that hypothetical neutrino-majoron coupling can suppress neutrino flavor oscillations in the early universe, in contrast to the usual weak interaction case. This reopens a window for a...
Stability of a cosmological model with dynamical cancellation of vacuum energy (2003)
The stability of cosmological solutions in the recently suggested specific mechanism of dynamical compensation of vacuum energy is studied. It is found that the solutions in the original version lead...
Big Bang Nucleosynthesis and neutrinos (2003)
Villante, F. L., Dolgov, A. D.
We present a brief review of Big Bang Nucleosynthesis (BBN). We discuss theoretical and observational uncertainties in deuterium and helium-4 primordial abundances and their implications for the...
BBN bounds on active-sterile neutrino mixing (2003)
Dolgov, A. D., Villante, F. L.
Nucleosynthesis restrictions on mixing of active neutrinos with possible sterile ones are obtained with the account of experimentally determined mixing between all active neutrinos. The earlier...
Realistic cosmological model with dynamical cancellation of vacuum energy (2003)
We propose a model with a compensating scalar field whose back reaction to the cosmological curvature cancels possible vacuum energy density down to the terms of the order of the time dependent...
Can modified gravity explain accelerated cosmic expansion? (2003)
We show that the recently suggested explanations of cosmic acceleration by the modification of gravity at small curvature suffer violent instabilities and strongly disagree with the known properties...
Magnetic fields in cosmology (2003)
Different mechanisms which may possibly explain existence of magnetic fields on astronomically large scales are described. A recently suggested model of magnetic fields generation slightly before...
Cosmology at the Turn of Centuries (2003)
A brief review of the present-day development of cosmology is presented for mixed physical audience. The universe history is briefly described. Unsolved problems are discussed, in particular, the...
Cosmological Constraints on Neutrino Masses and Mixings (2003)
The bounds on neutrino masses and mixing that follows from the data on light element abundances, large scale structure formation, and angular fluctuations of cosmic microwave background radiation are...
Generation of large scale magnetic fields at recombination epoch (2003)
It is argued that large scale cosmic magnetic field could be generated in the primeval plasma slightly before hydrogen recombination. Non-zero vorticity, necessary for that, might be created by the...
Cosmological Matter-Antimatter Asymmetry and Antimatter in the Universe (2002)
Models of baryogenesis which may lead to astronomically significant amount of antimatter in the universe are reviewed. Observational features are briefly discussed.
Cosmological Implications of Neutrinos (2002)
The lectures describe several cosmological effects produced by neutrinos. Upper and lower cosmological limits on neutrino mass are derived. The role that neutrinos may play in formation of large...
Cosmological Implications of Neutrinos (2002)
The lectures describe several cosmological effects produced by neutrinos. Upper and lower cosmological limits on neutrino mass are derived. The role that neutrinos may play in formation of large...
Antimatter in the Universe (2002)
Different scenarios of baryogenesis are briefly reviewed from the point of view of possibility of generation of cosmologically interesting amount of antimatter. It is argued that creation of...
Mystery of Vacuum Energy or Rise and Fall of Cosmological Constant (2002)
Two sides of cosmological constant problem are discussed: a mysterious compensation of all contributions to vacuum energy with the accuracy of 100-50 orders of magnitude and a surprising equality of...
Neutrinos and Big Bang Nucleosynthesis (2002)
The role of neutrinos in big bang nucleosynthesis is discussed. The bounds on the number of neutrino families, neutrino degeneracy, parameters of neutrino oscillations are presented. A model of...
Cosmological implications of neutrinos are reviewed. The following subjects are discussed at a different level of scrutiny: cosmological limits on neutrino mass, neutrinos and primordial...
Cosmological bounds on neutrino degeneracy improved by flavor oscillations (2002)
Dolgov, A. D., Hansen, S. H., Pastor, S., Petcov, S. T., Raffelt, G. G., Semikoz, D. V.
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. collisional...
Big Bang Nucleosynthesis (2002)
A review of Big Bang Nucleosynthesis (BBN) is presented. Observations of deuterium and helium-4 are discussed. Some BBN restrictions on non-standard physics, especially on neutrino properties and...
Cosmological bounds on neutrino degeneracy improved by flavor oscillations (2002)
Dolgov,A. D., Hansen,S. H., Pastor,S., Petcov,S. T., Raffelt,G. G., Semikoz,D. V.
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. collisional...
Cosmological bounds on neutrino degeneracy improved by flavor oscillations (2002)
Dolgov, A. D., Hansen, S. H., Pastor, S., Petcov, S. T., Raffelt, G. G., Semikoz, D. V.
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. collisional...
Cosmological bounds on neutrino degeneracy improved by flavor oscilaltions (2002)
Dolgov, A. D., Hansen, S. H., Pastor, Sergio, Petcov, Serguey T., Raffelt, G. G., Semikoz, D. V.
Particle Production in Cosmology and Imaginary Time Method (2001)
After brief personal recollections of the author's long-time friendship with Misha Marinov the problem of particle production by classical time- varying scalar field is discussed. In the...
Generation of Magnetic Fields in Cosmology (2001)
Mechanisms of generation of magnetic fields in the early universe which could seed the present-day large scale galactic magnetic fields, are briefly reviewed. Three possible ways to create large...
Neutrinos, Oscillations, and Big Bang Nucleosynthesis (2001)
The role of neutrinos in big bang nucleosynthesis is reviewed. Neutrino oscillations in the early universe both in resonance and non-resonance case are briefly discussed. BBN and supernova limits on...
Generation of Cosmic Magnetic Fields and Gravitational Waves at Neutrino Decoupling (2001)
We show that an inhomogeneous cosmological lepton number may have produced turbulence in the primordial plasma when neutrinos entered (almost) free-streaming regime. This effect may be responsible...
Phase Transitions During Inflation and Chemically Inhomogeneous Universe (2001)
Several models of baryo(lepto)-genesis that give rise to large inhomogeneities in the composition of the universe are presented. In particular, a variation of primordial abundances of light elements...
Producing massive sterile neutrinos as warm Dark Matter (2001)
This paper has been withdrawn by the authors. This paper started with a wrong term describing elastic scattering. The correct form of the kinetic equations for the density matrix are derived e.g. in...
Neutrino oscillations in the early universe. Resonant case (2001)
Lepton asymmetry generated in the early universe by neutrino oscillations into sterile partners is calculated. Kinetic equations are analytically reduced to a simple form that permits an easy...
Matter-antimatter domains in the universe (2000)
A possible existence of cosmologically large domains of antimatter or astronomical ``anti-objects'' is discussed. A brief review of different scenarios of baryogenesis predicting a noticeable amount...
Dolgov, A. D., Hansen, S. H., Pastor, S., Semikoz, D. V.
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 calculated for...
Gravitational waves, baryogenesis, and dark matter from primordial black holes (2000)
Dolgov, A. D., Naselsky, P. D., Novikov, I. D.
We discuss the hypothesis that the cosmological baryon asymmetry and entropy were produced in the early Universe by the primordial black hole (PBHs) evaporation.
Massive sterile neutrinos as warm Dark Matter (2000)
We show that massive sterile neutrinos mixed with the ordinary ones may be produced in the early universe in the right amount to be natural warm dark matter particles. Their mass should be in the...
Massive sterile neutrinos as warm Dark Matter (2000)
We show that massive sterile neutrinos mixed with the ordinary ones may be produced in the early universe in the right amount to be natural warm dark matter particles. Their mass should be below 40...
Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A (2000)
Dolgov, A. D., Hansen, S. H., Raffelt, G., Semikoz, D. V.
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 supernovae and...
Neutrinos in physics, astrophysics, and cosmology (2000)
A brief review of neutrino anomalies in particle physics and of the role played by neutrinos in cosmology and astrophysics is presented. The main part of the talk is dedicated to the impact of...
Restrictions on neutrino oscillations from BBN. Non-resonant case (2000)
New nucleosynthesis bounds on the oscillation parameters of active neutrinos mixed with a sterile one are derived for the non-resonant case. The controversy in the literature whether to use the...
Neutrino Oscillations and Cosmology (2000)
Phenomenology of neutrino oscillations in vacuum and in cosmological plasma is considered. Neutrino oscillations in vacuum are usually described in plane wave approximation. In this formalism there...
Cosmological and astrophysical bounds on a heavy sterile neutrino and the KARMEN anomaly (2000)
Dolgov, A. D., Hansen, S. H., Raffelt, G., Semikoz, D. V.
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 1987A. Together...
Dark matter in the universe (1999)
Cosmological arguments proving that the universe is dominated by invisible non-baryonic matter are reviewed. Possible physical candidates for dark matter particles are discussed. A particular...
Neutrino oscillations in the early universe: How large lepton asymmetry can be generated? (1999)
Dolgov, A. D., Hansen, S. H., Pastor, S., Semikoz, D. V.
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, sin 2\theta <...
Neutrino Degeneracy and Chemically Inhomogeneous Universe (1999)
A possibility that the universe may be strongly inhomogeneous chemically, while very smooth energetically, is considered. A possible mechanism which could lead to such a picture is a large and...
Neutrino oscillations in the early universe: How large lepton asymmetry can be generated? (1999)
Dolgov, A. D., Hansen, S. H., Pastor, Sergio, Semikoz, D. V.
Equation of motion of a classical scalar field with back reaction of produced particles (1998)
In the one-loop approximation we derive the equation of motion for a classical scalar field \phi_c (t) with the back reaction of particle production included. Renormalization of mass and couplings of...
Unstable massive tau-neutrinos and primordial nucleosynthesis (1998)
Dolgov, A. D., Hansen, S. H., Pastor, S., Semikoz, D. V.
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 respectively. The...
Superluminal propagation of light in gravitational field and non-causal signals (1998)
It has been found in several papers that, because of quantum corrections, light front can propagate with superluminal velocity in gravitational fields and even in flat space-time across two...
Nonequilibrium cosmic neutrinos and nucleosynthesis (1998)
The neutrino role in primordial nucleosynthesis is reviewed. The importance of nonequilibrium effects is emphasized both for the standard massless and possibly massive neutrinos. The upper bound on...
Dolgov, A. D., Doroshkevich, A. G., Novikov, D. I., Novikov, I. D.
Analysis of the singularities of the polarization field of CMB, where polarization is equal to zero, is presented. It is found that the classification of the singular points differs from the usual...
Dolgov, A. D., Hansen, S. H., Semikoz, D. V.
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 factor in one of...
Cosmology: Theory and Observations (1998)
The comparison of the Standard Cosmological Model (SCM) with astronomical observations, i.e. theory versus experiment, and with the Minimal Standard Model (MSM) in particle physics, i.e. theory...
Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations (1997)
Dolgov, A. D., Hansen, S. H., Semikoz, D. V.
The influence of a massive Majorana tau-neutrino on primordial nucleosynthesis is rigorously calculated. The system of three integro-differential kinetic equations is solved numerically for the...
Varying leptonic chemical potentials and spatial variation of primordial deuterium at high z (1997)
Dolgov, A. D., Pagel, B. E. J.
We try to explain the spatial variation of primordial deuterium suggested by some observations by varying leptonic chemical potentials. The variation of the latter may take place in some scenarios of...
Velocity of signal in attractive potential and propagation of light in gravitational field (1997)
Dolgov, A. D., Khriplovich, I. B.
The propagation of a massless field in attractive and repulsive potentials is considered. It is shown that though the group velocity in such potentials can be larger than one, the wave front...
Quantum field theory predicts that vacuum energy (or what is the same, cosmological constant) should be 50-100 orders of magnitude larger than the existing astronomical limit. A very brief review of...
Baryogenesis, 30 Years after (1997)
A review of the basic principles of baryogenesis is given. Baryogenesis in heavy particle decays as well as electroweak, SUSY-condensate, and spontaneous baryogenesis are discussed. The models of...
Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe (1997)
Dolgov, A. D., Hansen, S. H., Semikoz, D. V.
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-differential kinetic...
Dolgov, A. D., Morozov, A. Yu., Okun, L. B., Schepkin, M. G.
We develop a theory of the EPR-like effects due to neutrino oscillations in the $\pi \to \mu\nu$ decays. Its experimental implications are space-time correlations of neutrino and muon when they are...
Instructive Properties of Quantized Gravitating Dust Shell (1997)
Dolgov, A. D., Khriplovich, I. B.
We investigate quantum dynamics of self-gravitating spherical dust shell. The wave functions of discrete spectrum are not localized inside the Schwarzschild radius. We argue that such shells can...
Primordial Nucleosynthesis, Majorons and Heavy Tau Neutrinos (1996)
Dolgov, A. D., Pastor, S., Romao, J. C., Valle, J. W. F.
We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of nu-tau annihilations into Majorons, as expected in a wide class of particle physics...
Higher spin fields and the problem of cosmological constant (1996)
The cosmological evolution of free massless vector or tensor (but not gauge) fields minimally coupled to gravity is analyzed. It is shown that there are some unstable solutions for these fields in De...
Nonequilibrium corrections to energy spectra of massive particles in expanding universe (1996)
Deviations from kinetic equilibrium of massive particles caused by the universe expansion are calculated analytically in the Boltzmann approximation. For the case of an energy independent amplitude...
Antimatter in Different Baryogenesis Scenarios (1996)
Possible mechanisms of abundant creation of antimatter in the universe are reviewed. The necessary conditions for that are: baryonic charge nonconservation, spontaneous breaking of charge symmetry or...
Cosmological implications of neutrinos are reviewed. The subjects considered involve: (a) bounds on neutrino mass from the observational limits on the universe age and the Hubble constant both in...
An improved cosmological bound on the tau-neutrino mass (1996)
Dolgov, A. D., Pastor, S., Valle, J. W. F.
We consider the influence of non-equilibrium electronic neutrinos (and anti-neutrinos) on the neutron-to-proton ratio. These neutrinos would come from massive $\nu_\tau$ annihilations $\bar \nu_\tau...
Asymmetric Inflationary Reheating and the Nature of Mirror Universe (1995)
Berezhiani, Z. G., Dolgov, A. D., Mohapatra, R. N.
The existence of a shadow world (or mirror universe) with matter and forces identical to that of the visible world but interacting with the latter only via gravity can be motivated by superstring...
Problems of Dark Matter (1995)
The data indicating existence of different forms of dark matter in the universe as well as the role of this matter in structure formation are briefly reviewed. It is argued that vacuum energy gives a...
These lectures have been given to particle physicists, mostly experimentalists and very briefly and at a pedestrian level review the problems of dark matter. The content of the lectures is the...
Structure Formation with a Decaying Mev Tau Neutrino and a Kev Majoron (1995)
Dolgov, A. D., Pastor, S., Valle, J. W. F.
We consider the scenario of large scale structure formation with tau neutrino with mass in the MeV range and lifetime of order of years which decays into a massive majoron with KeV mass. The latter...
How strong can the coupling of leptonic photons be? (1995)
Blinnikov, S. I., Dolgov, A. D., Okun, L. B., Voloshin, M. B.
Consequences of possible existence of leptonic photon are considered for a range of values of leptonic charge. In the case of a strong Coulomb-like leptonic repulsion between electrons the existence...
Bounds on Dirac Neutrino Masses from Nucleosynthesis (1994)
Dolgov, A. D., Kainulainen, K., Rothstein, I. Z.
We derive new bounds on the Dirac mass of the tau and muonic neutrinos. By solving the kinetic equation for the rate of energy deposition due to helicity flipping processes and imposing the...
The Vacuum of de~Sitter Space (1994)
Dolgov, A. D., Einhorn, M. B., Zakharov, V. I.
To resolve infrared problems with the de~Sitter invariant vacuum, we argue that the history of the de~Sitter phase is crucial. We illustrate how either (1)~the diagonalization of the Hamiltonian for...
A review on the present state of the baryogenesis is given with an emphasis on electroweak baryogenesis. Technical details of the numerous models considered in the literature are not elaborated but...
On Infrared Effects in de~Sitter Background (1994)
Dolgov, A. D., Einhorn, M. B., Zakharov, V. I.
We have estimated higher order quantum gravity corrections to de~Sitter spacetime. Our results suggest that, while the classical spacetime metric may be distorted by the graviton self-interactions,...
BARYOGENESIS. byvited talk at TAUP 93, LNGS, Italy, September 1993 (1993)
A review of the present state of the baryogenesis is given with an emphasis on electroweak baryogenesis. Technical details of the numerous models cosidered in the literature are not elaborated but...
Fermi-Dirac corrections to the relic abundances (1993)
Dolgov, A. D., Kainulainen, K.
We derive an equation for the evolution of the number density of a massive particle species in the early universe, which correctly accounts for the Fermi-Dirac (FD) statistics. The FD-corrections are...
New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations (1993)
Dolgov, A. D., Rothstein, I. Z.
In this paper we reconsider recently derived bounds on $MeV$ tau neutrinos, taking into account previously unaccounted for effects. We find that, assuming that the neutrino life-time is longer than...
Fermi-Dirac corrections to relic abundances (1992)
Dolgov, A. D., Kainulainen, K.
We derive an equation for the evolution of the number density of a massive particle species in the early Universe, which correctly accounts for the Fermi-Dirac (FD) statistics. The FD-corrections are...