Reconstruction of a Scale-dependent Gravitational Phase Transition
In this work we extend our earlier phenomenological model for a gravitational phase transition and its generalization to early times by letting the modifications in the linearly perturbed Einstein equations be scale dependent. These modifications are characterized as deviations of the parameters μ (...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acfa6e |
| _version_ | 1797634191566831616 |
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| author | Marzieh Farhang Nima Khosravi |
| author_facet | Marzieh Farhang Nima Khosravi |
| author_sort | Marzieh Farhang |
| collection | DOAJ |
| description | In this work we extend our earlier phenomenological model for a gravitational phase transition and its generalization to early times by letting the modifications in the linearly perturbed Einstein equations be scale dependent. These modifications are characterized as deviations of the parameters μ ( z , k ) and γ ( z , k ) from their values in general relativity (GR). The scale-dependent amplitudes of modified μ ( z , k ) and γ ( z , k ) and the parameters defining the phase transition, along with the standard cosmological parameters, are measured by various data combinations. Out of the perturbation parameters, we construct gravity eigenmodes that represent patterns of perturbations best detectable by data. We detect no significant deviation from GR in these parameters. However, the larger parameter space produced due to the new degrees of freedom allows for the reconciliation of various data sets that are in tension in ΛCDM. In particular, we find H _0 = 71.9 ± 9.2 from anisotropies of the cosmic microwave background as measured by Planck (and various measurements of the baryonic acoustic oscillations, in agreement with local Hubble measurements). We also find that the σ _8 tension between the measurements of the Dark Energy Survey and Planck is reduced to less than 1 σ . |
| first_indexed | 2024-03-11T12:04:20Z |
| format | Article |
| id | doaj.art-078a5c03eb91477f8dcbea03a705dc7b |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T12:04:20Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-078a5c03eb91477f8dcbea03a705dc7b2023-11-07T16:37:32ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-019581610.3847/1538-4357/acfa6eReconstruction of a Scale-dependent Gravitational Phase TransitionMarzieh Farhang0Nima Khosravi1Department of Physics, Shahid Beheshti University , 1983969411, Tehran, Iran ; m_farhang@sbu.ac.ir, n-khosravi@sbu.ac.irDepartment of Physics, Shahid Beheshti University , 1983969411, Tehran, Iran ; m_farhang@sbu.ac.ir, n-khosravi@sbu.ac.irIn this work we extend our earlier phenomenological model for a gravitational phase transition and its generalization to early times by letting the modifications in the linearly perturbed Einstein equations be scale dependent. These modifications are characterized as deviations of the parameters μ ( z , k ) and γ ( z , k ) from their values in general relativity (GR). The scale-dependent amplitudes of modified μ ( z , k ) and γ ( z , k ) and the parameters defining the phase transition, along with the standard cosmological parameters, are measured by various data combinations. Out of the perturbation parameters, we construct gravity eigenmodes that represent patterns of perturbations best detectable by data. We detect no significant deviation from GR in these parameters. However, the larger parameter space produced due to the new degrees of freedom allows for the reconciliation of various data sets that are in tension in ΛCDM. In particular, we find H _0 = 71.9 ± 9.2 from anisotropies of the cosmic microwave background as measured by Planck (and various measurements of the baryonic acoustic oscillations, in agreement with local Hubble measurements). We also find that the σ _8 tension between the measurements of the Dark Energy Survey and Planck is reduced to less than 1 σ .https://doi.org/10.3847/1538-4357/acfa6eCosmologyGeneral relativityPrincipal component analysisCosmological constant |
| spellingShingle | Marzieh Farhang Nima Khosravi Reconstruction of a Scale-dependent Gravitational Phase Transition The Astrophysical Journal Cosmology General relativity Principal component analysis Cosmological constant |
| title | Reconstruction of a Scale-dependent Gravitational Phase Transition |
| title_full | Reconstruction of a Scale-dependent Gravitational Phase Transition |
| title_fullStr | Reconstruction of a Scale-dependent Gravitational Phase Transition |
| title_full_unstemmed | Reconstruction of a Scale-dependent Gravitational Phase Transition |
| title_short | Reconstruction of a Scale-dependent Gravitational Phase Transition |
| title_sort | reconstruction of a scale dependent gravitational phase transition |
| topic | Cosmology General relativity Principal component analysis Cosmological constant |
| url | https://doi.org/10.3847/1538-4357/acfa6e |
| work_keys_str_mv | AT marziehfarhang reconstructionofascaledependentgravitationalphasetransition AT nimakhosravi reconstructionofascaledependentgravitationalphasetransition |