Corrections of the spectra with de sitter background in Krein space

Iranian Journal of Physics Research

MMohsenzadeh¹  EYusofi² 

[1]1. Department of Physics, Qom Branch, Islamic Azad University, Qom, Iran

[2]2. Department of Physics, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran

关键词: power spectrum;    de sitter background;    inflation;    Krein space;   

DOI  :  

来源: DOAJ

【 摘 要 】

Gravitational waves are the last unconfirmed prediction of the general relativity. These waves are tiny fluctuations in world frame that dessipate energy throghout space. The gravitatinal waves spectra of fluctuations can be originated from the non-linear effects during different cosmic evolution periods, especially from initially non-linear and excited vacuum state in the very early universe. Based on this fact, in this paper introducing "excited-de Sitter vacuum" as a fundamental mode, the obtained power spectrum has been investigated. Corrected spectra obtained from Hilbert and Krein spaces are compared.The renormalization approach presented in this work, preserves the curved space-time symmetry and stimulates us to use excited de Sitter mode. Also, the corrections obtained from the non-linear mode includes the second-order corrections and in the linear limit accords with the results from conventional methods.

【 授权许可】

Unknown