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Title: CCDM model from quantum particle creation: constraints on dark matter mass

In this work the results from the quantum process of matter creation have been used in order to constrain the mass of the dark matter particles in an accelerated Cold Dark Matter model (Creation Cold Dark Matter, CCDM). In order to take into account a back reaction effect due to the particle creation phenomenon, it has been assumed a small deviation ε for the scale factor in the matter dominated era of the form t{sup 2/3+ε}. Based on recent H(z) data, the best fit values for the mass of dark matter created particles and the ε parameter have been found as m = 1.6× 10{sup 3} GeV, restricted to a 68.3% c.l. interval of 1.5 < m < 6.3× 10{sup 7}) GeV and ε = -0.250{sup +0.15}{sub -0.096} at 68.3% c.l. For these best fit values the model correctly recovers a transition from decelerated to accelerated expansion and admits a positive creation rate near the present era. Contrary to recent works in CCDM models where the creation rate was phenomenologically derived, here we have used a quantum mechanical result for the creation rate of real massive scalar particles, given a self consistent justification for the physical process. This method also indicates a possible solution to the so called ''dark degeneracy'',more » where one can not distinguish if it is the quantum vacuum contribution or quantum particle creation which accelerates the Universe expansion.« less
Authors:
 [1] ;  [2]
  1. Universidade Estadual Paulista ''Júlio de Mesquita Filho'' — Campus Itapeva, Rua Geraldo Alckmin 519, 18409-010, Vila N. Sra. de Fátima, Itapeva, SP (Brazil)
  2. Departamento de Física e Química — Faculdade de Engenharia de Guaratinguetá, Universidade Estadual Paulista ''Júlio de Mesquita Filho'', Av. Ariberto Pereira da Cunha 333, 12516-410, Pedregulho, Guaratinguetá, SP (Brazil)
Publication Date:
OSTI Identifier:
22373447
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EXPANSION; MASS; NONLUMINOUS MATTER; QUANTUM MECHANICS; UNIVERSE