Searching for scalar gravitational interactions in current and future cosmological data
| Autor: | Gong-Bo Zhao, Aaron Plahn, Philippe Brax, Levon Pogosian, Anne-Christine Davis, Alireza Hojjati, Alex Zucca |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Linear perturbation theory 010308 nuclear & particles physics Scalar (physics) FOS: Physical sciences Large Synoptic Survey Telescope General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Redshift General Relativity and Quantum Cosmology Gravitation Theoretical physics 0103 physical sciences Principal component analysis Dilaton 010303 astronomy & astrophysics Scalar field Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Hojjati, A, Plahn, A, Zucca, A, Pogosian, L, Brax, P, Davis, A-C & Zhao, G-B 2016, ' Searching for scalar gravitational interactions in current and future cosmological data ', Physical Review D, vol. 93, no. 4, 043531 . https://doi.org/10.1103/PhysRevD.93.043531 |
| DOI: | 10.48550/arxiv.1511.05962 |
| Popis: | Modified gravity theories often contain a scalar field of gravitational strength which interacts with matter. We examine constraints on the range and the coupling strength of a scalar gravitational degree of freedom using a subset of current data that can be safely analyzed within the linear perturbation theory. Using a model-independent implementation of scalar-tensor theories in MGCAMB in terms of two functions of the scale factor describing the mass and the coupling of the scalar degree of freedom, we derive constraints on the $f(R)$, generalized chameleon, Symmetron and Dilaton models. Since most of the large scale structure data available today is from relatively low redshifts, only a limited range of observed scales is in the linear regime, leading to relatively weak constraints. We then perform a forecast for a future large scale structure survey, such as Large Synoptic Survey Telescope (LSST), which will map a significant volume at higher redshifts, and show that it will produce much stronger constraints on scalar interactions in specific models. We also perform a principal component analysis and find that future surveys should be able to provide tight constraints on several eigenmodes of the scalar mass evolution. Comment: 15 pages, 13 figures, 4 tables. Uses MGCAMB and CosmoFish codes |
| Databáze: | OpenAIRE |
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