Broken scale invariance, $\alpha$-attractors and vector impurity

Autor:	Akarsu, Ozgur, Boran, Sibel, Kahya, Emre O., Ozdemir, Nese, Ozkan, Mehmet
Rok vydání:	2016
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory
Zdroj:	Eur. Phys. J. C 77 (2017) 306
Druh dokumentu:	Working Paper
DOI:	10.1140/epjc/s10052-017-4874-x
Popis:	We show that if the $\alpha$-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 $\alpha$-parameter as $5/6 < \alpha < 1$ 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 $\alpha$ 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. Comment: 10 pages, no figures and tables; matches the version published in EPJC
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1606.05308 Zobrazit plný text záznamu View this record from Arxiv