Towards the Reconstruction of a Unified Dark Matter Halo: a Phenomenological Approach
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866918413333430272 |
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| author | Caputo, Claudia Bertacca, Daniele Bassi, Alberto Matarrese, Sabino |
| author_facet | Caputo, Claudia Bertacca, Daniele Bassi, Alberto Matarrese, Sabino |
| contents | We investigate static, spherically symmetric halo configurations within Unified Dark Matter (UDM) scalar-field models, developing a systematic mapping between standard cold dark matter (CDM) density profiles and their UDM counterparts. Exploiting the equivalence-class structure of UDM models, we show that, in principle, different Lagrangian realisations can share the same weak-field rotation curve while exhibiting distinct field properties. We reconstruct the effective energy density, radial and tangential pressures from a phenomenological circular velocity profile, ensuring the absence of ghosts and instabilities and the preservation of the Null Energy Condition (NEC). Applying our procedure to several commonly used CDM halo profiles -- including Persic, Salucci \& Stel, NFW, and Burkert models -- we demonstrate that their phenomenological success can be retained within a relativistic UDM framework, reproducing the observed flatness of rotation curves without introducing separate dark matter and dark energy components. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26562 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards the Reconstruction of a Unified Dark Matter Halo: a Phenomenological Approach Caputo, Claudia Bertacca, Daniele Bassi, Alberto Matarrese, Sabino Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We investigate static, spherically symmetric halo configurations within Unified Dark Matter (UDM) scalar-field models, developing a systematic mapping between standard cold dark matter (CDM) density profiles and their UDM counterparts. Exploiting the equivalence-class structure of UDM models, we show that, in principle, different Lagrangian realisations can share the same weak-field rotation curve while exhibiting distinct field properties. We reconstruct the effective energy density, radial and tangential pressures from a phenomenological circular velocity profile, ensuring the absence of ghosts and instabilities and the preservation of the Null Energy Condition (NEC). Applying our procedure to several commonly used CDM halo profiles -- including Persic, Salucci \& Stel, NFW, and Burkert models -- we demonstrate that their phenomenological success can be retained within a relativistic UDM framework, reproducing the observed flatness of rotation curves without introducing separate dark matter and dark energy components. |
| title | Towards the Reconstruction of a Unified Dark Matter Halo: a Phenomenological Approach |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.26562 |