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arXiv 2201.07238astro-ph.COgr-qchep-phhep-th
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BOSS星系巡天对单场暴胀的限制

Constraints on Single-Field Inflation from the BOSS Galaxy Survey

Giovanni Cabass, Mikhail M. Ivanov, Oliver H. E. Philcox, Marko Simonović, Matias Zaldarriaga

摘要:

非定域原始非高斯性(NLPNG)是单场暴胀模型中相互作用的确凿证据,可以写成等边和正交模板的组合。我们提出的第一个约束,这些从红移空间星系的功率谱和重子振荡光谱巡天(BOSS)的数据的双谱。这是第一次独立于宇宙微波背景波动的测量。我们进行了一致的分析,包括所有必要的非线性校正产生的NLPNG,并改变所有相关的宇宙学和滋扰参数在一个全球性的适合的数据。我们的保守分析得出了等边和正交形状$f_{\rm NL}^{\rm equil}=940\pm 600$、$f_{\rm NL}^{\rm ortho}= -170\pm 170$(均为68\% CL)振幅的联合限值。这些可以用来推导出对有效的单场暴胀拉格朗日量的系数的约束;特别地,我们发现暴胀子波动的声速在95 CL处具有$c_s\geq 0.013$的约束。在固定星系二次偏差和宇宙学参数的情况下,可以将约束收紧到$f_{\rm NL}^{\rm equil}=260\pm 300$,$f_{\rm NL}^{\rm ortho}= -23\pm 120$(68 CL).

英文摘要:

Non-local primordial non-Gaussianity (NLPNG) is a smoking gun of interactions in single-field inflationary models, and can be written as a combination of the equilateral and orthogonal templates. We present the first constraints on these from the redshift-space galaxy power spectra and bispectra of the Baryon Oscillation Spectroscopic Survey (BOSS) data. These are the first such measurements independent of the cosmic microwave background fluctuations. We perform a consistent analysis that includes all necessary nonlinear corrections generated by NLPNG, and vary all relevant cosmological and nuisance parameters in a global fit to the data. Our conservative analysis yields joint limits on the amplitudes of the equilateral and orthogonal shapes, $f_{\rm NL}^{\rm equil}=940\pm 600$, $f_{\rm NL}^{\rm ortho}= -170\pm 170$ (both at 68\% CL). These can be used to derive constraints on coefficients of the effective single-field inflationary Lagrangian; in particular, we find that the sound speed of inflaton fluctuations has the bound $c_s\geq 0.013$ at 95\% CL. Fixing the quadratic galaxy bias and cosmological parameters, the constraints can be tightened to $f_{\rm NL}^{\rm equil}=260\pm 300$, $f_{\rm NL}^{\rm ortho}= -23\pm 120$ (68\% CL).

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