Big bang nucleosynthesis constraints on higher-order modified gravities
Big bang nucleosynthesis constraints on higher-order modified gravities
复制标题
大爆炸核合成对高阶修正引力的约束
DOI：
10.1103/physrevd.105.084010
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发表时间：
2021
影响因子：
5
通讯作者：
E. Saridakis
中科院分区：
文献类型：
--
作者：
Petros Asimakis;S. Basilakos;N. Mavromatos;E. Saridakis
我们使用大爆炸核合成（BBN）数据来对高阶修正重力施加约束，特别是：(i) $f(G)$高斯-邦纳引力和$f(P)$三次引力，分别通过使用二次曲率高斯-邦纳$G$项和三次曲率组合产生，（ii）弦激励的二次高斯-邦纳引力与膨胀场耦合，（iii）弦激励的四次曲率修正模型，以及（iv）运行真空模型。我们对BBN时代进行了详细的研究，并计算了与$\Lambda$ CDM模式相比冻结温度$T_f$的偏差。然后，我们使用$ \left|\frac{\delta {T}_f}{{T}_f}\right|$上的观测界来提取各种模型所涉及参数的约束。我们发现所有模型都可以满足BBN约束，因此它们构成了可行的宇宙学情景，因为它们可以定量地解释暗能量部分和晚时间加速，而不会破坏BBN时期轻元素的形成。然而，得到的有关模型参数的约束是很强的。
We use Big Bang Nucleosynthesis (BBN) data in order to impose constraints on higher-order modified gravity, and in particular on: (i) $f(G)$ Gauss-Bonnet gravity, and $f(P)$ cubic gravities, arising respectively through the use of the quadratic-curvature Gauss-Bonnet $G$ term, and the cubic-curvature combination, (ii) string-inspired quadratic Gauss-Bonnet gravity coupled to the dilaton field, (iii) models with string-inspired quartic curvature corrections, and (iv) running vacuum models. We perform a detailed investigation of the BBN epoch and we calculate the deviations of the freeze-out temperature $T_f$ in comparison to $\Lambda$CDM paradigm. We then use the observational bound on $ \left|\frac{\delta {T}_f}{{T}_f}\right|$ in order to extract constraints on the involved parameters of various models. We find that all models can satisfy the BBN constraints and thus they constitute viable cosmological scenarios, since they can additionally account for the dark energy sector and the late-time acceleration, in a quantitative manner, without spoiling the formation of light elements during the BBN epoch. Nevertheless, the obtained constraints on the relevant model parameters are quite strong.
影响因子：
4.4
作者：
A. D. Felice;S. Tsujikawa
通讯作者：
A. D. Felice;S. Tsujikawa
f（r）理论。
影响因子：
40.6
作者：
De Felice A;Tsujikawa S
通讯作者：
Tsujikawa S