Trace-anomaly driven inflation in f(T) gravity with a cosmological constant

Gudekli E., MYRZAKULOV N., YERZHANOV K., MYRZAKULOV R.

ASTROPHYSICS AND SPACE SCIENCE, cilt.357, sa.1, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 357 Sayı: 1
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s10509-015-2269-8
  • Dergi Adı: ASTROPHYSICS AND SPACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Dark energy, f(T) gravity, Cosmological constant, PROBE WMAP OBSERVATIONS, PHASE-TRANSITION, UNIVERSE, MODELS, VACUUM, R-2-INFLATION, PERTURBATIONS, DYNAMICS, TORSION
  • İstanbul Üniversitesi Adresli: Evet

Özet

In this paper, we have investigated trace-anomaly (TA) driven inflation in Generalized Teleparallel gravity (namely f(T)). A quasi de Sitter (dS) scenario for inflation is proposed like in the case of R-2 gravity. It has been found that in f (T) gravity, the dS solution for inflation is unstable due to the conformal anomaly (CA). As an illustrative example, we have analyzed trace anomaly driven inflation in a T-2 + f(T)-model. Furthermore, a model with a non zero cosmological constant is studied. We have shown that dS solution always remains unstable also in the presence of cosmological constant, but for Anti dS (AdS) case the situation dramatically changes.

In this paper, we have investigated trace-anomaly (TA) driven inflation in Generalized Teleparallel gravity (namely f(T)). A quasi de Sitter (dS) scenario for inflation is proposed like in the case of R2 gravity. It has been found that in f(T) gravity, the dS solution for inflation is unstable due to the conformal anomaly (CA). As an illustrative example, we have analyzed trace anomaly driven inflation in a T2+f(T)-model. Furthermore, a model with a non zero cosmological constant is studied. We have shown that dS solution always remains unstable also in the presence of cosmological constant, but for Anti dS (AdS) case the situation dramatically changes.