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Upper bounds on matter-antimatter admixture from gamma-ray observations of colliding clusters of galaxies with the Fermi Large Area Telescope

Prokhorov, D. A.

Physical review. D, Particles, fields, gravitation, and cosmology, 2015-04, Vol.91 (8), Article 083002 [Periódico revisado por pares]

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  • Título:
    Upper bounds on matter-antimatter admixture from gamma-ray observations of colliding clusters of galaxies with the Fermi Large Area Telescope
  • Autor: Prokhorov, D. A.
  • Assuntos: Admixtures ; Astroparticle Physics ; Astropartikelfysik ; Confidence intervals ; Cosmology ; Galactic clusters ; Galaxies ; gamma-ray ; gamma-ray bursts ; gamma-ray sources ; Gravitation ; Origin and formation of the Universe ; Universe ; Upper bounds
  • É parte de: Physical review. D, Particles, fields, gravitation, and cosmology, 2015-04, Vol.91 (8), Article 083002
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: We examined whether significant constraints on matter-antimatter admixture can be derived from gamma-ray observations of colliding clusters of galaxies with Fermi-LAT. We selected ten known systems of colliding clusters of galaxies for the analysis and computed the upper bounds on matter-antimatter admixture in these systems, which range from 7 x 10 super(-9) to 2 x 10 super(-6). This allowed us to exclude a symmetric universe on scales of order ~ 20 Mpc at the confidence level of 99.9%. Adopting the number of systems of colliding galaxy clusters from the Marenostrum Universe cosmological simulation, we checked if the Fermi-LAT second source catalog contains a sufficient number of gamma-ray sources to provide us with the required number of sources possibly associated with pp annihilation from cluster-anticluster collisions. We found that a matter-antimatter-symmetric universe is strongly ruled out on scales of order ~ 20 Mpc if a matter-antimatter admixture in these bullet-like systems is of [functionof] [> ~] 10 super(-5), and on scales of order ~ 400 Mpc if [functionof] [> ~] 10 super(-4).
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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