Broken scale invariance, α -attractors and vector impurity

Özgür Akarsu; Sibel Boran; Emre Onur Kahya; Neşe Özdemir; Mehmet Ozkan

doi:10.1140/epjc/s10052-017-4874-x

Broken scale invariance, α -attractors and vector impurity

Özgür Akarsu^*, Sibel Boran, Emre Onur Kahya, Neşe Özdemir, Mehmet Ozkan

^*Corresponding author for this work

Department of Physics Engineering

Istanbul Technical University

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

1 Citation (Scopus)

Abstract

We show that if the α-attractor model is realized by the spontaneous breaking of the scale symmetry, then the stability and the dynamics of the vector field that gauges the scale symmetry can severely constrain the α-parameter as 5 / 6 < α< 1 restricting the inflationary predictions in a very tiny region in the n_s- r plane that are in great agreement with the latest Planck data. Although the different values of α do not make a tangible difference for n_s and r, they provide radically different scenarios for the post-inflationary dynamics which determines the standard BBN processes and the large scale isotropy of the universe.

Original language	English
Article number	306
Journal	European Physical Journal C
Volume	77
Issue number	5
DOIs	https://doi.org/10.1140/epjc/s10052-017-4874-x
Publication status	Published - 1 May 2017

Bibliographical note

Publisher Copyright:
© 2017, The Author(s).

Funding

We thank Gokhan Alkac, Glenn Barnich and Shahin Sheikh-Jabbari for valuable comments on conserved charges, and Renata Kallosh, Andrei Linde, Diederik Roest and Marco Scalisi for valuable comments on superconformal -attractors. ÖA acknowledges the support by the Distinguished Young Scientist Award BAGEP of the Science Academy. EOK acknowledges the support by Turkish Academy of Sciences Distinguished Young Scientist Award TÜBA-GEBİP 2015. The work of MO is supported in part by the Marie Curie Cofund (No. 116C028).

Funders	Funder number
Marie Curie Cofund	116C028
Türkiye Bilimler Akademisi
Bilim Akademisi

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Broken scale invariance, α -attractors and vector impurity

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