Interacting dark energy from the joint analysis of the power spectrum and bispectrum multipoles with the EFTofLSS
Interacting dark energy from the joint analysis of the power spectrum and bispectrum multipoles with the EFTofLSS
复制标题
通过 EFTofLSS 联合分析功率谱和双谱多极子来交互暗能量
DOI：
10.1093/mnras/stad260
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发表时间：
2023
影响因子：
4.8
通讯作者：
Tsedrik M
中科院分区：
文献类型：
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作者：
Tsedrik M
相互作用的暗能量模型已被建议作为标准宇宙学模型（ΛCDM）的替代方案。我们关注的是一类在现象学上很有趣的暗散射模型，它的特征是暗能量和暗物质之间的纯动量交换。该模型对ΛCDM的参数空间扩展了两个参数wandA，分别定义了暗能量状态方程和暗能量与暗物质之间的耦合强度。为了用第四阶段星系团调查测试非标准宇宙学，建立轻度非线性尺度模型并进行精度与准确性测试至关重要。我们采用大尺度结构的有效场论；我们使用大量n体模拟，通过MCMC分析进行验证测试。我们发现，在功率谱多极子中加入双谱单极子改善了forhmpc−1对暗能量参数的约束，而不会在参数估计中引入偏差。我们还发现，同样的改进可以通过更适度的尺度削减和使用偏置关系，或添加双谱四极子来实现。最后，我们研究了暗能量参数与标量幅值之间的简并，并讨论了相应的投影效应，以及与其他宇宙学参数的简并。
Interacting dark energy models have been suggested as alternatives to the standard cosmological model, ΛCDM. We focus on a phenomenologically interesting class of dark scattering models that is characterized by pure momentum exchange between dark energy and dark matter. This model extends the parameter space with respect to ΛCDM by two parameters,wandA, which define the dark energy equation of state and the strength of the coupling between dark energy and dark matter, respectively. In order to test non-standard cosmologies with Stage-IV galaxy clustering surveys, it is crucial to model mildly non-linear scales and perform precision versus accuracy tests. We use the Effective Field Theory of Large-Scale Structure; and we perform validation tests by means of an MCMC analysis using a large set ofN-body simulations. We find that adding the bispectrum monopole to the power spectrum multipoles improves the constraints on the dark energy parameters byforhMpc−1, without introducing biases in the parameter estimation. We also find that the same improvement can be achieved with more moderate scale cuts and the use of bias relations, or with the addition of the bispectrum quadrupole. Finally, we study degeneracies between the dark energy parameters and the scalar amplitudeAsand discuss the corresponding projection effects, as well as degeneracies with other cosmological parameters.