Linear Point and Sound Horizon as Purely Geometric standard rulers
| Autor: | Glenn D. Starkman, Stefano Anselmi, Ravi K. Sheth, Márcio O'Dwyer, Pier Stefano Corasaniti, Idit Zehavi |
|---|---|
| Přispěvatelé: | Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
cosmological model Cosmology and Nongalactic Astrophysics (astro-ph.CO) geometry satellite: Planck Cosmic microwave background Cosmic background radiation FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics cosmic background radiation power spectrum baryon: oscillation: acoustic 01 natural sciences Cosmology General Relativity and Quantum Cosmology Monte Carlo: Markov chain horizon symbols.namesake High Energy Physics - Phenomenology (hep-ph) statistical analysis 0103 physical sciences numerical methods Statistical physics correlation function Planck 010306 general physics numerical calculations Physics COSMIC cancer database perturbation: primordial 010308 nuclear & particles physics Standard ruler Observable High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) symbols [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] Baryon acoustic oscillations [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Phys.Rev.D Phys.Rev.D, 2020, 101 (8), pp.083517. ⟨10.1103/PhysRevD.101.083517⟩ |
| DOI: | 10.1103/PhysRevD.101.083517⟩ |
| Popis: | The Baryon Acoustic Oscillations feature (BAO) imprinted in the clustering correlation function is known to furnish us cosmic distance determinations that are independent of the cosmological-background model and the primordial perturbation parameters. These measurements can be accomplished rigorously by means of the Purely Geometric BAO methods. To date two different Purely Geometric BAO approaches have been proposed. The first exploits the linear-point standard ruler. The second, called correlation-function model-fitting, exploits the sound-horizon standard ruler. A key difference between them is that, when estimated from clustering data, the linear point makes use of a cosmological-model-independent procedure to extract the ratio of the ruler to the cosmic distance, while the correlation-function model-fitting relies on a phenomenological cosmological model for the correlation function. Nevertheless the two rulers need to be precisely defined independently of any specific observable. We define the linear point and sound horizon and we characterize and compare the two rulers' cosmological-parameter dependence. We find that they are both geometrical within the required accuracy, and they have the same parameter dependence for a wide range of parameter values. We estimate the rulers' best-fit values and errors given the cosmological constraints obtained by the Planck Satellite team from the CMB measurements. We do this for three different cosmological models encompassed by the Purely Geometric BAO methods. In each case we find that the relative errors of the two rulers coincide and they are insensitive to the assumed cosmological model. Interestingly both the linear point and the sound horizon shift by $0.5\sigma$ when we do not fix the spatial geometry to be flat in LCDM. This points toward a sensitivity of the rulers to different cosmological models when they are estimated from the CMB. Comment: 13 pages, 7 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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