Constraints on inflation with LSS surveys: features in the primordial power spectrum

Palma, Gonzalo A.; Sapone, Domenico; Sypsas, Spyros

doi:10.1088/1475-7516/2018/06/004

Cited by 37 publications

(37 citation statements)

References 181 publications

(228 reference statements)

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“…e.g. [83][84][85][86][87][88][89]) in a number of ways, in particular by taking the effects of nonlinearities, bandpowers and window functions into account, and (conservatively) marginalizing over further uncertainties in the broadband power spectrum. Furthermore, we compare the reach of LSS surveys to that of future CMB missions.…”

Section: Future Lss and Cmb Constraintsmentioning

confidence: 99%

Primordial features from linear to nonlinear scales

Beutler

Biagetti

Green

et al. 2019

Phys. Rev. Research

148

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Sharp features in the primordial power spectrum are a powerful window into the inflationary epoch. To date, the cosmic microwave background (CMB) has offered the most sensitive avenue to search for these signatures. In this paper, we demonstrate the power of large-scale structure observations to surpass the CMB as a probe of primordial features. We show that the signatures in galaxy surveys can be separated from the broadband power spectrum and are as robust to the nonlinear evolution of matter as the standard baryon acoustic oscillations. As a result, analyses can exploit a significant range of scales beyond the linear regime available in the datasets. We develop a feature search for large-scale structure, apply it to BOSS DR12 data and find new bounds on oscillatory features that exceed the sensitivity of Planck for a significant range of frequencies. Moreover, we forecast that the next generation of galaxy surveys, such as DESI and Euclid, will be able to improve current constraints by up to an order of magnitude over an expanded frequency range. References 517 This result has also been independently derived in [43] using ω log 1 as an expansion parameter. 8 These findings are also confirmed by analyses of N -body simulations performed in [44].

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Section: Future Lss and Cmb Constraintsmentioning

confidence: 99%

Primordial features from linear to nonlinear scales

Beutler

Biagetti

Green

et al. 2019

Phys. Rev. Research

148

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“…Here we report the main equations of the weak lensing tomographic signal and we refer to the literature for further details [82,[89][90][91]. The weak lensing convergence power spectrum is a linear function of the matter power spectrum convoluted with the lensing properties of the survey.…”

Section: Weak Gravitational Lensingmentioning

confidence: 99%

Cosmological constraints on the gravitational constant

Ballardini,

Finelli,

Sapone

2021

Preprint

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We study the variation of the gravitational Newton's constant on cosmological scales in scalar-tensor theories of gravity. We focus on the simplest models of scalar-tensor theories with a coupling to the Ricci scalar of the form F (σ) = N 2 pl + ξσ 2 , such as extended Jordan-Brans-Dicke (N pl = 0), or a non-minimally coupled scalar field with N pl = M pl , which permits the gravitational constant to vary self-consistently in time and space. In addition, we allow the gravitational constant to differ from the Newton's constant G, i.e. G eff (z = 0) = G (1 + ∆) 2 . We study the impact of this imbalance ∆ jointly with the coupling ξ into anisotropies of the cosmic microwave background and matter power spectrum at low-redshift. Combining the information from Planck 2018 CMB temperature, polarization and lensing, together with a compilation of BAO measurements from the release DR12 of the Baryon Oscillation Spectroscopic Survey (BOSS), we constrain the imbalance to ∆ = −0.022 ± 0.023 (68% CL) and the coupling parameter to 10 3 ξ < 0.82 (95% CL) for Jordan-Brans-Dicke and for a non-minimally coupled scalar field with F (σ) = M 2 pl + ξσ 2 we constrain the imbalance to ∆ > −0.018 (< 0.021) and the coupling parameter to ξ < 0.089 (ξ > −0.041) both at 95% CL. These constraints correspond to a variation of the gravitational constant now respect to the one in the radiation era to be smaller than 3% (95% CL) and to the ratio of the gravitational Newton's constant measured from cosmological scales and the one measured in a Cavendish-like experiment to be smaller than 4-15% (95% CL). With current data, we observe that the degeneracy between ∆, the coupling ξ to the Ricci scalar, and H 0 allows for a larger value of the Hubble constant increasing the agreement between the distanceladder measurement of the Hubble constant from supernovae type Ia by the SH0ES team and its value inferred by CMB data. We study also how future cosmological observations can constrain the gravitational Newton's constant. Future data such as the combination of CMB anisotropies from LiteBIRD and CMB-S4, and large-scale structures galaxy clustering from DESI and galaxy shear from LSST reduce the uncertainty to σ(∆) 0.004.

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“…In particular, CMB data have been used to search for oscillatory features with WMAP [14,15] and Planck power spectra [16][17][18], as well as with measurements of the CMB bispectrum [19][20][21]. Additionally, different authors have carried out numerical analysis with the past * zeng.544@osu.edu CMB and LSS data sets [22,23] and laid out forecasts for constraints with future observations [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Searching for oscillations in the primordial power spectrum with CMB and LSS data

et al. 2019

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Different inflationary models predict oscillatory features in the primordial power spectrum. These can leave an imprint on both the cosmic microwave background (CMB) and the large-scale structure (LSS) of our Universe, that can be searched for with current data. Inspired by the axion-monodromy model of inflation, we search for primordial oscillations that are logarithmic in wavenumber, using both CMB data from the Planck satellite and LSS data from the WiggleZ galaxy survey. We find that, within our search range for the new oscillation parameters (amplitude, frequency and phase), both CMB-only and CMB+LSS data yield the same best-fit oscillation frequency of log 10 ω = 1.5, improving the fit over ΛCDM by ∆χ 2 = −9 and ∆χ 2 = −13 (roughly corresponding to 2σ and 2.8σ significance), respectively. Bayesian evidence for the log-oscillation model versus ΛCDM indicates a very slight preference for the latter. Future CMB and LSS data will further probe this scenario.

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Constraints on inflation with LSS surveys: features in the primordial power spectrum

Cited by 37 publications

References 181 publications

Primordial features from linear to nonlinear scales

Primordial features from linear to nonlinear scales

Cosmological constraints on the gravitational constant

Searching for oscillations in the primordial power spectrum with CMB and LSS data

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