The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters
In the context of chameleon gravity, we present a semi-analytical solution of the chameleon field profile in an accurately modelled galaxy cluster’s mass components, namely the stellar mass of the Brightest Cluster Galaxy (BCG), the baryonic mass in galaxies other than the BCG, the mass of the Intra...
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MDPI AG
2024-11-01
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| Online Access: | https://www.mdpi.com/2218-1997/10/12/443 |
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| author | Lorenzo Pizzuti Valentina Amatori Alexandre M. Pombo Sandeep Haridasu |
| author_facet | Lorenzo Pizzuti Valentina Amatori Alexandre M. Pombo Sandeep Haridasu |
| author_sort | Lorenzo Pizzuti |
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| description | In the context of chameleon gravity, we present a semi-analytical solution of the chameleon field profile in an accurately modelled galaxy cluster’s mass components, namely the stellar mass of the Brightest Cluster Galaxy (BCG), the baryonic mass in galaxies other than the BCG, the mass of the Intra-Cluster Medium (ICM) and the diffuse cold dark matter (CDM). The obtained semi-analytic profile is validated against the numerical solution of the chameleon field equation and implemented in the <span style="font-variant: small-caps;">MG-MAMPOSSt</span> code for kinematic analyses of galaxy clusters in modified gravity scenarios. By means of mock halos, simulated both in GR and in modified gravity, we show that the combination of the velocities and positions of cluster member galaxies, along with the data of the stellar velocity dispersion profile of the BCG, can impose constraints on the parameter space of the chameleon model; for a cluster generated in GR, these constraints are at the same level as a joint lensing+kinematics analysis of a cluster modelled with a single mass profile, without the BCG data. |
| format | Article |
| id | doaj-art-5b10f6d4323a4877a2b4d2ce047bc96c |
| institution | DOAJ |
| issn | 2218-1997 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj-art-5b10f6d4323a4877a2b4d2ce047bc96c2025-08-20T02:57:18ZengMDPI AGUniverse2218-19972024-11-01101244310.3390/universe10120443The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy ClustersLorenzo Pizzuti0Valentina Amatori1Alexandre M. Pombo2Sandeep Haridasu3Dipartimento di Fisica G. Occhialini, Universitá degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, ItalyDepartment of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, SwitzerlandCentral European Institute for Cosmology and Fundamental Physics (CEICO), Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha, Czech RepublicSISSA, Via Bonomea 265, 34136 Trieste, ItalyIn the context of chameleon gravity, we present a semi-analytical solution of the chameleon field profile in an accurately modelled galaxy cluster’s mass components, namely the stellar mass of the Brightest Cluster Galaxy (BCG), the baryonic mass in galaxies other than the BCG, the mass of the Intra-Cluster Medium (ICM) and the diffuse cold dark matter (CDM). The obtained semi-analytic profile is validated against the numerical solution of the chameleon field equation and implemented in the <span style="font-variant: small-caps;">MG-MAMPOSSt</span> code for kinematic analyses of galaxy clusters in modified gravity scenarios. By means of mock halos, simulated both in GR and in modified gravity, we show that the combination of the velocities and positions of cluster member galaxies, along with the data of the stellar velocity dispersion profile of the BCG, can impose constraints on the parameter space of the chameleon model; for a cluster generated in GR, these constraints are at the same level as a joint lensing+kinematics analysis of a cluster modelled with a single mass profile, without the BCG data.https://www.mdpi.com/2218-1997/10/12/443modified gravitygalaxy clusterscosmology |
| spellingShingle | Lorenzo Pizzuti Valentina Amatori Alexandre M. Pombo Sandeep Haridasu The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters Universe modified gravity galaxy clusters cosmology |
| title | The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters |
| title_full | The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters |
| title_fullStr | The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters |
| title_full_unstemmed | The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters |
| title_short | The Shape of the Chameleon Fifth-Force on the Mass Components of Galaxy Clusters |
| title_sort | shape of the chameleon fifth force on the mass components of galaxy clusters |
| topic | modified gravity galaxy clusters cosmology |
| url | https://www.mdpi.com/2218-1997/10/12/443 |
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