Limits on $w$CDM from the EFTofLSS with the PyBird code

Towards Precision Constraints on Gravity with the Effective Field Theory of Large-Scale Structure

We compare analytical computations with numerical simulations for dark-matter clustering, in general relativity and in the normal branch of DGP gravity (nDGP). Our analytical frameword is the Effective Field Theory of Large-Scale Structure (EFTofLSS), which we use to compute the one-loop dark-matter power spectrum, including the resummation of infrared bulk displacement effects. We compare this to a set of 20 COLA simulations at redshifts $z = 0$, $z=0.5$, and $z =1$, and fit the free parameter of the EFTofLSS, called the speed of sound, in both $Λ$CDM and nDGP at each redshift. At one-loop at…

Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors

We analyse the BOSS DR12 galaxy power spectrum data jointly with BAO data for three models of dark energy. We use recent measurements using a windowless estimator, and an independent and fast pipeline based on EFTofLSS implemented via the FAST-PT algorithm to compute the redshift-space loop corrections. We accelerate our analysis by using the BACCO linear emulator instead of a Boltzmann solver. We perform two sets of analyses: one with $3σ$ Planck priors on $A_s$ and $n_s$, and another that is CMB-free, without such priors. Firstly, we study $Λ$CDM, reproducing previous results obtained with t…

Interacting dark energy from the joint analysis of the power spectrum and bispectrum multipoles with the EFTofLSS

Interacting dark energy models have been suggested as alternatives to the standard cosmological model, $Λ$CDM. We focus on a phenomenologically interesting class of dark scattering models that is characterised by pure momentum exchange between dark energy and dark matter. This model extends the parameter space with respect to $Λ$CDM by two parameters, $w$ and $A$, 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 mo…

BOSS功率谱有效场论分析的一致性

Consistency of effective field theory analyses of the BOSS power spectrum

本文比较PyBird与CLASS-PT对BOSS功率谱的EFTofLSS全形状分析，发现参数先验及边缘化可导致最高2σ偏移，并评估不同测量与Planck结果的一致性。

基于近期CMB与LSS数据的自相互作用中微子

Self-interacting neutrinos in light of recent CMB and LSS data

本文利用Planck NPIPE、DESI BAO及EFTofBOSS数据重新约束含重标量媒介子的自相互作用中微子模型，发现不同大尺度结构分析对SI$ν$与$Λ$CDM的偏好存在分歧。

Effort：用于宇宙大尺度结构有效场论的快速可微仿真器

Effort: a fast and differentiable emulator for the Effective Field Theory of the Large Scale Structure of the Universe

本文发布快速可微的 EFTofLSS 仿真器 Effort，结合先进数值方法与预处理策略，并通过与 pybird 的贝叶斯后验对比验证其高精度与高效率。

红移空间星系三谱在EFTofLSS中的全形状分析

Full-Shape Analysis of the Redshift-Space Galaxy Trispectrum in the EFTofLSS

本文发展了星系三谱的树级EFTofLSS模型，并利用N体模拟验证，发现加入三谱可将暗物质密度参数约束改善15%，为探测原初非高斯性提供新途径。

The Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure

The Effective Field Theory of Large-Scale Structure (EFTofLSS) is a formalism that allows us to predict the clustering of Cosmological Large-Scale Structure in the mildly non-linear regime in an accurate and reliable way. After validating our technique against several sets of numerical simulations, we perform the analysis for the cosmological parameters of the DR12 BOSS data. We assume $Λ$CDM, a fixed value of the baryon/dark-matter ratio, $Ω_b/Ω_c$, and of the tilt of the primordial power spectrum, $n_s$, and no significant input from numerical simulations. By using the one-loop power spectru…

基于 EFTofLSS 的宇宙学推断：eBOSS QSO 全形状分析

Cosmological inference from the EFTofLSS: the eBOSS QSO full-shape analysis

本研究利用 EFTofLSS 对 eBOSS QSO 功率谱进行全形状分析，约束 ΛCDM 及其扩展参数，并通过多数据联合获得严格的中微子质量上限。

Constraining decaying dark matter with BOSS data and the effective field theory of large-scale structures

We update cosmological constraints on two decaying dark matter models in light of BOSS-DR12 data analyzed under the Effective Field Theory of Large-Scale Structures (EFTofLSS) formalism, together with Planck, Pantheon and other BOSS measurements of the baryonic acoustic oscillation (BAO). In the first model, a fraction $f_{\rm dcdm}$ of cold dark matter (CDM) decays into dark radiation (DR) with a lifetime $τ$. In the second model (recently suggested as a potential resolution to the $S_8$ tension), all the CDM decays with a lifetime $τ$ into DR and a massive warm dark matter (WDM) particle, wi…

通过LSS Bootstrap探测超出ΛCDM的非线性结构形成：功率谱与双谱的联合分析

Probing nonlinear structure formation beyond $Λ$CDM with the LSS bootstrap: a joint power spectrum and bispectrum analysis

本文通过联合分析功率谱和双谱，利用LSS Bootstrap方法对超出ΛCDM的参数进行约束，展示了ε_f和ε_dγ在区分背景膨胀变化与非线性结构形成变化中的互补作用。

早期暗能量对eBOSS DR16全形状分析的宇宙学约束

Cosmological constraints on early dark energy from the full shape analysis of eBOSS DR16

本研究利用eBOSS DR16全形状分析评估早期暗能量对哈勃张力缓解效果，发现其将张力从5.2σ降至3σ，但加入eBOSS数据后张力反而增大，凸显额外大尺度结构数据的重要性。

修改引力与大质量中微子：来自BOSS星系全形状分析的约束及第四阶段巡天预测

Modified gravity and massive neutrinos: constraints from the full shape analysis of BOSS galaxies and forecasts for Stage IV surveys

本文利用BOSS DR12功率谱全形状分析约束修改引力增长指数与中微子质量，并预测类DESI第四阶段巡天可显著提升$γ$约束。