Gravitational particle production in bouncing cosmologies

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/10/028· OSTI ID:22525249

Haro, Jaume ^[1]; Elizalde, Emilio ^[2]

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1. Departament de Matemàtica Aplicada I, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona (Spain)
2. Consejo Superior de Investigaciones Científicas, ICE-CSIC and IEEC, UAB Campus, 08193 Bellaterra, Barcelona (Spain)

It is argued that the Universe reheating in bouncing cosmologies could be explained via gravitational particle production, as due to a sudden phase transition in the contracting regime. To this end, it is shown that, in the context of Loop Quantum Cosmology, gravitational production of massive particles conformally coupled with gravity in a matter-ekpyrotic bouncing Universe, where the sudden phase transition occurs in the contracting regime, yields a reheating temperature which is in good agreement with cosmological observations.

• OSTI ID: 22525249
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
GRAVITATION
GRAVITATIONAL INTERACTIONS
LOOP QUANTUM GRAVITY
PARTICLE PRODUCTION
PHASE TRANSFORMATIONS
QUANTUM COSMOLOGY
UNIVERSE