Inflationary Cosmology in a non-minimal f (R, T) gravity theory using a RT mixing term

被引:7
作者
Sarkar, Payel [1 ]
Ashmita [1 ]
Das, Prasanta Kumar [1 ]
机构
[1] Birla Inst Technol & Sci Pilani, Dept Phys, KK Birla Goa Campus,NH-17B,Bypass Rd, Zuarinagar 403726, Goa, India
关键词
Inflation; Non-minimal coupling; RT-mixing term; Spectral index parameters; UNIVERSE; STABILITY; FLATNESS; HORIZON; MODELS;
D O I
10.1016/j.dark.2023.101190
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate a class of inflationary models in modified gravity theories which contain a non-minimal coupling between gravity and a scalar field 41 as f (R, T) = R(1 + & alpha; + K4/3T) + K2 & gamma; T where K2 = 8nG where G is Newton's constant. We consider two inflaton potentials of the form (i) V = V0 (1 + ln 41) & lambda;41p and (ii) V0 1+& lambda;41p . For different potential parameters, we have explored the constraints on the modified gravity parameters i.e. (& alpha;, /3, and & gamma;) in the following three cases: (i) /3 = 0, & alpha; = & gamma; = 0, (ii) & alpha; = 0, & gamma; = 0, /3 = 0 and (iii) & gamma; = 0, & alpha; = 0, /3 = 0 for the above two potentials. We find that by the inclusion of RT mixing term, the scalar spectral index ns and tensor-to-scalar ratio r are consistent with the 3 & sigma; limit of the Planck data as well as r < 0.056. & COPY; 2023 Elsevier B.V. All rights reserved.
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页数:8
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