https://doi.org/10.1140/epjc/s10052-021-09358-4
Regular Article - Theoretical Physics
Constraining effective equation of state in f(Q, T) gravity
1
Department of Mathematics, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, 500078, Hyderabad, India
2
International College of Liberal Arts, Yamanashi Gakuin University, 400-0805, Yamanashi, Japan
c
pksahoo@hyderabad.bits-pilani.ac.in
Received:
26
March
2021
Accepted:
19
June
2021
Published online:
28
June
2021
New high-precision observations are now possible to constrain different gravity theories. To examine the accelerated expansion of the Universe, we used the newly proposed f(Q, T) gravity, where Q is the non-metricity, and T is the trace of the energy–momentum tensor. The investigation is carried out using a parameterized effective equation of state with two parameters, m and n. We have also considered the linear form of 
, where b is constant. By constraining the model with the recently published 1048 Pantheon sample, we were able to find the best fitting values for the parameters b, m, and n. The model appears to be in good agreement with the observations. Finally, we analyzed the behavior of the deceleration parameter and equation of state parameter. The results support the feasibility of f(Q, T) as a promising theory of gravity, illuminating a new direction towards explaining the Universe dark sector.
© The Author(s) 2021
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