Open AccessJournal Article
Unstable Hadrons in Hot Hadron Gas in Laboratory and in the Early Universe
Inga Kuznetsova,Johann Rafelski +1 more
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In this paper, the same authors considered the formation and the natural decay of unstable particles in a thermal bath and obtained the thermal invariant reaction rate using as an input the free space (vacuum) decay time.Abstract:
We study kinetic master equations for chemical reactions involving the formation and the natural decay of unstable particles in a thermal bath. We consider the decay channel of one into two particles, and the inverse process, fusion of two thermal particles into one. We present the master equations for the evolution of the density of the unstable particles in the early Universe. We obtain the thermal invariant reaction rate using as an input the free space (vacuum) decay time and show the medium quantum effects on �+� $ � reaction relaxation time. As another laboratory example we describe the K +K $ � process in thermal hadronic gas in heavy ions collisions. A particularly interesting application of our formalism is the � 0 $ + process in the early Universe. We also explore the physics of � ± and µ ± freeze-out in the Universe.read more
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Equilibrium Statistical-Thermal Models in High-Energy Physics
TL;DR: A review of statistical-thermal models for particle production, fluctuations and collective flow in heavy-ion experiments can be found in this article, where the authors also review their reproduction of the lattice QCD thermodynamics at vanishing and finite chemical potential.
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Connecting QGP-Heavy Ion Physics to the Early Universe
TL;DR: In this article, the properties and evolution of quark-gluon plasma in the early universe and compare to laboratory heavy ion experiments are discussed, and how matter and antimatter emerged from a primordial soup of quarks and gluons.
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Boltzmann equation solver adapted to emergent chemical non-equilibrium
TL;DR: A novel method to solve the spatially homogeneous and isotropic relativistic Boltzmann equation with reduced computational cost and the ability to easily represent final state chemical non-equilibrium by studying a model problem motivated by the physics of the neutrino freeze-out processes in the early Universe.
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Angular power spectrum in publically released ALICE events
TL;DR: In this article, the particles emitted in the fireball following a Relativistic Heavy Ion Collision with the traditional angular analysis employed in cosmology and earth sciences, producing Mollweide plots of the number and p t distribution of a few actual, publically released ALICE-collaboration events and calculating their angular power spectrum.
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Entropy production in the early-cosmology pionic phase
TL;DR: In this paper, it was shown that pions carried a large share of the entropy and supported the largest inhomogeneities in the early universe, for temperatures in the approximate interval 150-80 MeV.
References
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Book
The Early Universe
Edward W. Kolb,Michael S. Turner +1 more
TL;DR: In this article, the Robertson-Walker Metric is used to measure the radius of the Planck Epoch in the expanding universe, which is a measure of the number of atoms in the universe.
Book
Kinetic theory in the expanding universe
TL;DR: In this article, the generalized Lee-Weinberg problem is used to solve the problem of cosmological helium production in the recombination regime, and the canonical example is given.
Journal ArticleDOI
The early universe
TL;DR: The early Universe, at times prior to recombination 10 5.5 years after the Big Bang, can not be studied by looking at individual objects as discussed by the authors, but there are several fossils from this epoch that can be studied.
Posted Content
Hadronization of the Quark Universe
TL;DR: In this article, the conditions in which matter (protons, neutrons) formed in the Early Universe during a period which spanned 10 -50mus were explored. And all chemical potentials implied by the present day baryon-to-photon ratio were obtained.