Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates

Marco de Cesare; Mairi Sakellariadou

doi:10.1016/j.physletb.2016.10.051

Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates

Marco de Cesare^*, Mairi Sakellariadou

^*Corresponding author for this work

King's College London

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

161 Downloads (Pure)

Abstract

We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations are classical, with quantum correction terms to the Friedmann equation given in the form of effective fluids coupled to the emergent classical background. The occurrence of a bounce, which resolves the initial spacetime singularity, is shown to be a general property of the model. A promising feature of this model is the occurrence of an era of accelerated expansion, without the need to introduce an inflaton field with an appropriately chosen potential. We discuss possible viability issues of this scenario as an alternative to inflation.

Original language	English
Pages (from-to)	49-53
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	764
Early online date	27 Oct 2016
DOIs	https://doi.org/10.1016/j.physletb.2016.10.051
Publication status	Published - 10 Jan 2017

Keywords

Bounce
Cosmology
Group Field Theory
Quantum gravity

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10.1016/j.physletb.2016.10.051Licence: CC BY

Accelerated expansion of the Universe_CESARE_Accepted 23Oct2016_GOLD VoRFinal published version, 280 KBLicence: CC BY

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abstract = "We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations are classical, with quantum correction terms to the Friedmann equation given in the form of effective fluids coupled to the emergent classical background. The occurrence of a bounce, which resolves the initial spacetime singularity, is shown to be a general property of the model. A promising feature of this model is the occurrence of an era of accelerated expansion, without the need to introduce an inflaton field with an appropriately chosen potential. We discuss possible viability issues of this scenario as an alternative to inflation.",

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AU - de Cesare, Marco

AU - Sakellariadou, Mairi

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N2 - We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations are classical, with quantum correction terms to the Friedmann equation given in the form of effective fluids coupled to the emergent classical background. The occurrence of a bounce, which resolves the initial spacetime singularity, is shown to be a general property of the model. A promising feature of this model is the occurrence of an era of accelerated expansion, without the need to introduce an inflaton field with an appropriately chosen potential. We discuss possible viability issues of this scenario as an alternative to inflation.

AB - We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations are classical, with quantum correction terms to the Friedmann equation given in the form of effective fluids coupled to the emergent classical background. The occurrence of a bounce, which resolves the initial spacetime singularity, is shown to be a general property of the model. A promising feature of this model is the occurrence of an era of accelerated expansion, without the need to introduce an inflaton field with an appropriately chosen potential. We discuss possible viability issues of this scenario as an alternative to inflation.

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KW - Quantum gravity

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates

Abstract

Keywords

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Cosmological implications of interacting group field theory models: Cyclic Universe and accelerated expansion

Cosmology from quantum gravity condensates

Impact of nonlinear effective interactions on group field theory quantum gravity condensates

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