Jointly fitting weak lensing, x-ray, and Sunyaev-Zel’dovich data to constrain scalar-tensor theories with clusters of galaxies

Cardone, V. F.; Karmakar, Purnendu; Petris, M. De; Maoli, R.

doi:10.1103/physrevd.103.064065

Cited by 9 publications

(6 citation statements)

References 60 publications

(104 reference statements)

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“…(1), this model is fully characterized, at the scales and in the limit of interest, by four parameters, namely, {Ξ 1 , Ξ 2 , Ξ 3 , γ 0 }, which can be related to more general EFT parameters by Eqs. ( 9) [64]. This model represents a generalisation with respect to the one analysed in [55,56], including one more term in the metric potential equation.…”

Section: Discussionmentioning

confidence: 99%

“…M (r) = 8πrρ(r) + 4πr 2 dρ dr , with ρ the mass density of the system; Ξ 1 , Ξ 2 and Ξ 3 (using the notation of [64]) are three dimensionless parameters which fully characterize the model and its deviation from GR, that can be recovered when Ξ 1,2,3 → 0; and G N is the measured effective gravitational constant, which might be different from the bare gravitational constant G defined from M 2 P L = (8πG) −1 . The fractional difference between G and G N is generally expressed as a parameter as [63]…”

Section: Modelmentioning

confidence: 99%

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Multi-component DHOST analysis in galaxy clusters

Laudato,

Salzano,

Umetsu

2021

Preprint

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Extended Theories of Gravity with additional scalar degrees of freedom have recently acquired increasing interest due to the presence of a screening mechanism that allows suppressing at small scales (e.g., the Solar System scale) every modification restoring General Relativity. In this work, we consider a second-order Extended Theory of Gravity belonging to the family of Degenerate High Order Scalar Tensor theories (DHOST) characterized by a partial breaking of the Vainshtein screening mechanism. We study this model in two different scenarios as a description of dark energy only and as a description of both dark matter and dark energy. Such scenarios have been tested here by analysing a sample of 16 high-mass galaxy clusters targeted by the Cluster Lensing and Supernova survey with Hubble (CLASH) program using two complementary probes, namely X-ray and strong-and-weak gravitational lensing observations. In mass modelling, we adopt a multi-component approach including hot gas and galactic stellar contributions. For the majority of the clusters in our sample, results show mild Bayesian evidence in favour of the DHOST model as a description of dark energy over General Relativity. This model also appears to alleviate the discrepancy present in General Relativity between X-ray hydrostatic and lensing mass estimates. For the second scenario where gravity acts as both dark energy and dark matter due to the partial breaking of the Vainshtein screening mechanism at cluster scales, the model is statistically disfavoured compared to General Relativity.

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Section: Discussionmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Multi-component DHOST analysis in galaxy clusters

Laudato,

Salzano,

Umetsu

2021

Preprint

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“…Such a tool will be of great interest for the astrophysical community, giving the opportunity to answer more complex questions [13], e.g. testing General Relativity [14] or assessing the heterogeneity of thermodynamic properties within the cluster population, such as the scatter in pressure or mass profiles.…”

Section: Current and Future Developmentsmentioning

confidence: 99%

Many-probes multi-object spatially-resolved analyses of galaxy clusters in the big data era

et al. 2022

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The thermal Sunyaev-Zeldovich (SZ) effect and the X-ray emission offer separate and highly complementary probes of the thermodynamics of the intracluster medium, particularly on their radial dependence. We already released JoXSZ, the first publicly available code designed to jointly fit SZ and X-ray data coming from various instruments to derive the thermodynamic radial profiles of galaxy clusters, including mass. JoXSZ follows a fully Bayesian forward-modelling approach, adopts flexible parametrization for the thermodynamic profiles and includes many useful options that users can customize according to their needs. We are including shear measurement in our joint analysis, and moving from single-cluster to multi-cluster analyses, allowing to quantify the heterogeneity of thermodynamic properties within the cluster population. At the same time, we are creating a suitable framework that effciently stores and optimally processes huge volumes of data being released by the current and new generation surveys.

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“…with: G N , the measured effective gravitational constant (the bare constant G defined in terms of the Planck mass M P l = (8πG) −1 ); M (r), the spherical mass enclosed in the radius r and M (r) and M (r), respectively, the first and the second order derivatives of the mass with respect to r; Ξ 1,2,3 , the parameters that define the properties of the model [56]. From Eq.…”

Section: Theorymentioning

confidence: 99%

DHOST gravity in Ultra-diffuse galaxies -- Part II: NGC 1052-DF4 and Dragonfly 44

Laudato¹,

Salzano²

2022

Preprint

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Ultra-Diffuse galaxies are a family of gravitational systems with quite varied properties. On one hand we have cases like NGC1052-DF2 and NGC1052-DF4, both observed by the Dragonfly Array Telescope, which are claimed to be highly-deficient in dark matter. On the other hand, we have also observed Ultra-Diffuse galaxies which are almost totally dominated by dark matter, such as DF44, which is estimated to be at 99% dark. To explain such kind of a variety of behaviors might be a problem for both the standard dark matter paradigm and for alternative theories of gravity that try to overcome dark matter existence by modifying General Relativity.Here we consider a modified gravity theory belonging to the family of Degenerate Higher-Order Scalar Tensor theories to study the internal kinematics of both NGC1052-DF4 and DF44. The peculiarity of the chosen model is the partial breaking of its Vaishtein screening mechanism for which it might have an influence not only on cosmological scales but also on astrophysical ones. We consider two different possibilities: one in which the model only plays the role of dark energy; and another one in which it might also mimic a sort of effective dark matter.We get conflicting results. For NGC1052-DF4 we confirm that the galaxy dynamics might be successfully described even only by a stellar component and that, at least at the scale which are probed, the content of dark matter is quite low. In addition to that, we also show that the alternative gravity model is totally consistent with data and is statistically equivalent to a standard General Relativity dark matter scenario, and it might even replace dark matter. On the contrary, DF44 requires dark matter both in General Relativity and in our alternative gravity model. When the latter is considered only as a cosmological dark energy fluid, it is statistically fully reliable and equivalent to General Relativity. But when we try to use it to substitute dark matter, although we get good fits to the data, the constraints on the theoretical parameters are in sharp contrast with those derived from more stringent probes from the stellar scales.

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Jointly fitting weak lensing, x-ray, and Sunyaev-Zel’dovich data to constrain scalar-tensor theories with clusters of galaxies

Cited by 9 publications

References 60 publications

Multi-component DHOST analysis in galaxy clusters

Multi-component DHOST analysis in galaxy clusters

Many-probes multi-object spatially-resolved analyses of galaxy clusters in the big data era

DHOST gravity in Ultra-diffuse galaxies -- Part II: NGC 1052-DF4 and Dragonfly 44

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