Determining the Hubble constant without the sound horizon: Perspectives with future galaxy surveys

Farren, Gerrit S.; Philcox, Oliver H. E.; Sherwin, Blake D.

doi:10.1103/physrevd.105.063503

Cited by 22 publications

(21 citation statements)

References 54 publications

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“…To further understand the role of geometrical and equality information in our results, we will closely follow the rationale of Refs. [327,328], and consider additional dataset combinations not including CMB measurements. Fullshape measurements contain the imprint of two "standard rulers": the first is connected to the scale of the sound horizon at baryon drag r d , and leaves its imprint in the position of the BAO wiggles, whereas the second is connected to the horizon wave number at matter-radiation equality k eq , and governs the position of the turnaround in the power spectrum; see Sec.…”

Section: Resultsmentioning

confidence: 99%

New tests of dark sector interactions from the full-shape galaxy power spectrum

et al. 2022

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We explore the role of redshift-space galaxy clustering data in constraining nongravitational interactions between dark energy (DE) and dark matter (DM), for which state-of-the-art limits have so far been obtained from late-time background measurements. We use the joint likelihood for prereconstruction full-shape (FS) galaxy power spectrum and postreconstruction Baryon Acoustic Oscillation (BAO) measurements from the BOSS DR12 sample, alongside Cosmic Microwave Background (CMB) data from Planck: from this dataset combination we infer H 0 ¼ 68.02 þ0.49 −0.60 km=s=Mpc and the 2σ lower limit ξ > −0.12, among the strongest limits ever reported on the DM-DE coupling strength ξ for the particular model considered. Contrary to what has been observed for the ΛCDM model and simple extensions thereof, we find that the CMB þ FS combination returns tighter constraints compared to the CMB þ BAO one, suggesting that there is valuable additional information contained in the broadband of the power spectrum. We test this finding by running additional CMB-free analyses and removing sound horizon information, and discuss the important role of the equality scale in setting constraints on DM-DE interactions. Our results reinforce the critical role played by redshift-space galaxy clustering measurements in the epoch of precision cosmology, particularly in relation to tests of nonminimal dark sector extensions of the ΛCDM model.

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Section: Resultsmentioning

confidence: 99%

New tests of dark sector interactions from the full-shape galaxy power spectrum

et al. 2022

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“…The exact k-reach of the perturbative treatment in particular has been the subject of an intense research activity, especially within the context of the EFT framework [12,13] (see also [26,27] for recent reviews). Even though several aspects need further developing on the "model building" front, there are already definite predictions on given observables, consisting mainly of the one-loop power spectrum and the tree-level bispectrum, that have already been employed in obtaining cosmological information from the LSS galaxy surveys [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Perturbation theory of LSS in the $Λ$CDM Universe: exact time evolution and the two-loop power spectrum

Fasiello¹,

Fujita²,

Vlah³

2022

Preprint

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We derive exact analytic solutions for density and velocity fields to all orders in Eulerian perturbation theory for ΛCDM cosmology. In particular, we show that density and velocity field kernels can be written in a separable form in time and momenta at each perturbative order. The kernel solutions are built from an analytic basis of momentum operators and their time-dependent coefficients, which solve a set of recursive differential equations. We also provide an exact closed perturbative solution for such coefficients, expanding around the (quasi-)EdS approximation. We find that the perturbative solution rapidly converges towards the numerically obtained solutions and its leading order result suffices for any practical requirements. To illustrate our findings, we compute the exact two-loop dark matter density and velocity power spectra in ΛCDM cosmology. We show that the difference between the exact ΛCDM and the (quasi-)EdS approximated result can reach the level of several percent. This deviation can be partially mitigated by exploiting the degeneracy with the EFT counterterms. As an additional benefit of our algorithm for the solutions of time-dependent coefficients, the computational complexity of power spectra loops in ΛCDM is reduced to the same level of the EdS case. In performing the two-loop computation, we devise an explicit method to implement the so-called IR cancellations, as well as the cancellations arising as a consequence of mass and momentum conservation.

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“…To further understand the role of geometrical and equality information in our results, we will closely follow the rationale of Refs. [318,319], and consider additional dataset combinations not including CMB measurements. Full-shape measurements contain the imprint of two "standard rulers": the first is connected to the scale of the sound horizon at baryon drag r d , and leaves its imprint in the position of the BAO wiggles, whereas the second is connected to the horizon wavenumber at matter-radiation equality k eq , and governs the position of the turnaround in the power spectrum, see Sec.…”

Section: Resultsmentioning

confidence: 99%

“…The later work of Ref. [319] constructs an improved method to remove geometrical information in galaxy clustering measurements in future surveys. For the purposes of the present work however, given the precision of BOSS FS measurements, removing any external informative prior on ω b is sufficient to ensure that the sound horizon information is essentially completely (or mostly) removed, and we will therefore follow the methodology of Ref.…”

Section: Resultsmentioning

confidence: 99%

New tests of dark sector interactions from the full-shape galaxy power spectrum

Nunes,

Vagnozzi,

Kumar

et al. 2022

Preprint

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We explore the role of redshift-space galaxy clustering data in constraining non-gravitational interactions between dark energy (DE) and dark matter (DM), for which state-of-the-art limits have so far been obtained from late-time background measurements. We use the joint likelihood for pre-reconstruction full-shape (FS) galaxy power spectrum and post-reconstruction Baryon Acoustic Oscillation (BAO) measurements from the BOSS DR12 sample, alongside Cosmic Microwave Background (CMB) data from Planck : from this dataset combination we infer H0 = 68.02 +0.49 −0.60 km/s/Mpc and the 2σ lower limit ξ > −0.12, among the strongest limits ever reported on the DM-DE coupling strength ξ for the particular model considered. Contrary to what has been observed for the ΛCDM model and simple extensions thereof, we find that the CMB+FS combination returns tighter constraints compared to the CMB+BAO one, suggesting that there is valuable additional information contained in the broadband of the power spectrum. We test this finding by running additional CMBfree analyses and removing sound horizon information, and discuss the important role of the equality scale in setting constraints on DM-DE interactions. Our results reinforce the critical role played by redshift-space galaxy clustering measurements in the epoch of precision cosmology, particularly in relation to tests of non-minimal dark sector extensions of the ΛCDM model.

show abstract

Determining the Hubble constant without the sound horizon: Perspectives with future galaxy surveys

Cited by 22 publications

References 54 publications

New tests of dark sector interactions from the full-shape galaxy power spectrum

New tests of dark sector interactions from the full-shape galaxy power spectrum

Perturbation theory of LSS in the $Λ$CDM Universe: exact time evolution and the two-loop power spectrum

New tests of dark sector interactions from the full-shape galaxy power spectrum

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