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

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• 作者：Marco de Cesare ; ^{marco.de_cesare@kcl.ac.uk} ; Mairi Sakellariadou ^{mairi.sakellariadou@kcl.ac.uk}
• 关键词：Quantum gravity ; Cosmology ; Bounce ; Group Field Theory
• 刊名：Physics Letters B
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：764
• 期：Complete
• 页码：49-53
• 全文大小：280 K
• 卷排序：764

文摘

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.