Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation

If the universe is slightly non-extensive, and the distribution functions are not exactly given by those of Boltzmann-Gibbs, the primordial production of light elements will be non-trivially modified. In particular, the principle of detailed balance (PDB), of fundamental importance in the standard a...

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Detalles Bibliográficos
Autores principales: Pessah, Martín Elías, Torres, Diego F.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Astronomía
Cosmology
Statistical mechanics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/130795
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-130795
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
Cosmology
Statistical mechanics
spellingShingle Astronomía
Cosmology
Statistical mechanics
Pessah, Martín Elías
Torres, Diego F.
Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
topic_facet Astronomía
Cosmology
Statistical mechanics
description If the universe is slightly non-extensive, and the distribution functions are not exactly given by those of Boltzmann-Gibbs, the primordial production of light elements will be non-trivially modified. In particular, the principle of detailed balance (PDB), of fundamental importance in the standard analytical analysis, is no longer valid, and a non-extensive correction appears. This correction is computed and its influence is studied and compared with previous works, where, even when the universe was considered as an slightly non-extensive system, the PDB was assumed valid. We analytically track the formation of Helium and Deuterium, and study the kind of deviation one could expect from the standard regime. The correction to the capture time, the moment in which Deuterium can no longer be substantially photo-disintegrated, is also presented. This allows us to take into account the process of the free decay of neutrons, which was absent in all previous treatments of the topic. We show that even when considering a first (linear) order correction in the quantum distribution functions, the final output on the primordial nucleosynthesis yields cannot be reduced to a linear correction in the abundances. We finally obtain new bounds upon the non-extensive parameter, both comparing the range of physical viability of the theory, and using the latest observational data.
format Articulo
Articulo
author Pessah, Martín Elías
Torres, Diego F.
author_facet Pessah, Martín Elías
Torres, Diego F.
author_sort Pessah, Martín Elías
title Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
title_short Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
title_full Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
title_fullStr Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
title_full_unstemmed Statistical mechanics and the description of the early universe : (II). Principle of detailed balance and primordial ⁴He formation
title_sort statistical mechanics and the description of the early universe : (ii). principle of detailed balance and primordial ⁴he formation
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/130795
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AT torresdiegof statisticalmechanicsandthedescriptionoftheearlyuniverseiiprincipleofdetailedbalanceandprimordial4heformation
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