Slow-roll inflation in f (R, T) gravity with a RT mixing term

被引：14
作者：
Chen, Che-Yu [1 ]
Reyimuaji, Yakefu [2 ]
Zhang, Xinyi [3 ]
机构：
[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[2] Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830046, Xinjiang, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
来源：
PHYSICS OF THE DARK UNIVERSE | 2022年 / 38卷
基金：
中国国家自然科学基金;
关键词：
Inflation; Modified gravity; Cosmology; PARTICLE PHYSICS MODELS; NATURAL INFLATION; SCALAR FIELD;
D O I：
10.1016/j.dark.2022.101130
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We consider slow-roll inflationary models in a class of modified theories of gravity which contains non-minimal curvature-inflaton couplings, i.e., the f (R, T) gravity, where R is the Ricci scalar and T is the trace of the inflaton energy-momentum tensor. On top of the minimally coupled T that has been widely investigated in the literature, we further include a RT mixing term in the theory. This mixing term introduces non-minimal derivative couplings and plays an important role in inflationary dynamics. Taking chaotic and natural inflation as examples, we find that the predictions for spectral tilt and the tensor-to-scalar ratio are sensitive to the existence of the RT mixing term. In particular, by turning on this mixing term, it is possible to bring chaotic and natural inflation into better agreement with observational data.(c) 2022 Elsevier B.V. All rights reserved.
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页数：9
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