Inflationary cosmology in the modified f (R, T) gravity

被引：13
作者：
Ashmita [1 ]
Sarkar, Payel [1 ]
Das, Prasanta Kumar [1 ]
机构：
[1] Birla Inst Technol & Sci Pilani, KK Birla Goa Campus,NH-17B, Zuarinagar 403726, Goa, India
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2022年 / 31卷 / 16期
关键词：
Modified gravity; inflation; slow-roll parameters; spectral index parameters; PROBE WMAP OBSERVATIONS; FLATNESS; UNIVERSE; HORIZON;
D O I：
10.1142/S0218271822501206
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this work, we study the inflationary cosmology in modified gravity theory f (R, T) R + 2 lambda T (lambda is the modified gravity parameter) with three distinct classes of inflation potentials (i) phi(p)e(-alpha phi), (ii) (1 - phi(p))e(-alpha phi) and (iii) alpha phi(2)/1+alpha phi(2)where alpha, p are the potential parameters. We have derived the Einstein equation, potential slow-roll parameters, the scalar spectral index n(s), tensor-to-scalar ratio r and tensor spectral index n(T) in modified gravity theory. We obtain the range of lambda using the spectral index constraints in the parameter space of the potentials. Comparing our results with PLANCK 2018 data and WMAP data, we found out the modified gravity parameter lambda lies between -0.37 < lambda < 1.483.
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页数：14
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