We constrain the chameleon screening mechanism in galaxy clusters, essentially obtaining limits on the coupling strength β and the asymptotic value of the field ϕ∞. For this purpose, we utilized a collection of the nine relaxed galaxy clusters within the X-COP compilation in the redshift range of z ≤ 0.1. We implement the formalism assuming a Navarro-Frenk-White mass profile for the dark matter density and study the degeneracy present between the mass M500 and the chameleon coupling with a high degree of improvement in the constraints for excluded parameter space. We recast our constrain to an upper limit on the scalaron field in fðRÞ subclass of models of jfR0j ≤ 9.2 × 10−6, using all the nine clusters and jfR0j ≤ 1.2 × 10−5 using only five clusters with Weak lensing priors taken into account, at a 95% confidence level. These bounds are consistent with existing limits in the literature and tighter than the constraints obtained with the same method by previous studies.

Constraining chameleon screening using galaxy cluster dynamics / Boumechta, Yacer; Haridasu, Balakrishna S.; Pizzuti, Lorenzo; Butt, Minahil Adil; Baccigalupi, Carlo; Lapi, Andrea. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:4(2023), pp. 1-15. [10.1103/physrevd.108.044007]

Constraining chameleon screening using galaxy cluster dynamics

Baccigalupi Carlo;Lapi, Andrea
2023-01-01

Abstract

We constrain the chameleon screening mechanism in galaxy clusters, essentially obtaining limits on the coupling strength β and the asymptotic value of the field ϕ∞. For this purpose, we utilized a collection of the nine relaxed galaxy clusters within the X-COP compilation in the redshift range of z ≤ 0.1. We implement the formalism assuming a Navarro-Frenk-White mass profile for the dark matter density and study the degeneracy present between the mass M500 and the chameleon coupling with a high degree of improvement in the constraints for excluded parameter space. We recast our constrain to an upper limit on the scalaron field in fðRÞ subclass of models of jfR0j ≤ 9.2 × 10−6, using all the nine clusters and jfR0j ≤ 1.2 × 10−5 using only five clusters with Weak lensing priors taken into account, at a 95% confidence level. These bounds are consistent with existing limits in the literature and tighter than the constraints obtained with the same method by previous studies.
2023
108
4
1
15
044007
https://arxiv.org/abs/2303.02074
Boumechta, Yacer; Haridasu, Balakrishna S.; Pizzuti, Lorenzo; Butt, Minahil Adil; Baccigalupi, Carlo; Lapi, Andrea
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/133750
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