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arXiv 2102.12921gr-qcastro-ph.COhep-th
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$f(Q,T)$重力的BBN约束

BBN Constraints on $f(Q,T)$ Gravity

Snehasish Bhattacharjee

发表信息：
International Journal of Modern Physics A, 37, 06, 2250017 (2022)
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摘要：

$f(Q,T)$引力是对称远程平行引力的一种新的推广，其中拉格朗日$L$通过非度量$Q$和能量动量张量$T$的迹\cite{fqt}的任意函数来表示.在这项工作中，我们已经限制了广泛使用的$f(Q,T)$重力模型的形式$f(Q,T) = Q^{n+1} + m T$从原始丰度的轻元素，以了解其在宇宙学的可行性。我们报告说，$f(Q,T)$重力模型可以优雅地解释观测到的氦和氘的丰度，而锂的问题仍然存在。从$0.9425 \lesssim Z \lesssim1.1525$范围内的扩展因子的约束，我们报告严格的约束参数$m$和$n$的范围$-1.13 \lesssim n \lesssim -1.08$和$-5.86 \lesssim m \lesssim12.52$分别。

英文摘要：

$f(Q,T)$ gravity is a novel extension of the symmetric teleparallel gravity where the Lagrangian $L$ is represented through an arbitrary function of the nonmetricity $Q$ and the trace of the energy-momentum tensor $T$ \cite{fqt}. In this work, we have constrained a widely used $f(Q,T)$ gravity model of the form $f(Q,T) = Q^{n+1} + m T$ from the primordial abundances of the light elements to understand its viability in Cosmology. We report that the $f(Q,T)$ gravity model can elegantly explain the observed abundances of Helium and Deuterium while the Lithium problem persists. From the constraint on the expansion factor in the range $0.9425 \lesssim Z \lesssim1.1525$, we report strict constraints on the parameters $m$ and $n$ in the range $-1.13 \lesssim n \lesssim -1.08$ and $-5.86 \lesssim m \lesssim12.52$ respectively.

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