Dust stars in the minimal exponential measure model
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918109019897856 |
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| author | Lambaga, Reyhan D. Feng, Justin C. Hsia, Norman Chen, Pisin |
| author_facet | Lambaga, Reyhan D. Feng, Justin C. Hsia, Norman Chen, Pisin |
| contents | We report the existence of horizonless compact object solutions supported by dust in the Minimal Exponential Measure (MEMe) model, a theory which modifies the couplings between gravity and matter without introducing dynamical degrees of freedom. For a perfect fluid source, the field equations for the MEMe model can be rewritten as the Einstein field equations sourced by a perfect fluid with a transformed equation of state, which can endow a sufficiently dense cloud of dust with an effective pressure. The resulting dust-supported horizonless compact objects can have masses below $\sim 10^{-11}~M_\odot$, making them suitable as MACHOs comprising a significant mass fraction for dark matter. A necessary condition for the existence of these compact object solutions is that the single free parameter in the MEMe model is positive-valued. Additionally, we find that this positive sign for the parameter can provide a mechanism for suppressing the formation of (primordial) black holes from the gravitational collapse of matter below a certain mass scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11591 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dust stars in the minimal exponential measure model Lambaga, Reyhan D. Feng, Justin C. Hsia, Norman Chen, Pisin General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics 83D99, 83C55 We report the existence of horizonless compact object solutions supported by dust in the Minimal Exponential Measure (MEMe) model, a theory which modifies the couplings between gravity and matter without introducing dynamical degrees of freedom. For a perfect fluid source, the field equations for the MEMe model can be rewritten as the Einstein field equations sourced by a perfect fluid with a transformed equation of state, which can endow a sufficiently dense cloud of dust with an effective pressure. The resulting dust-supported horizonless compact objects can have masses below $\sim 10^{-11}~M_\odot$, making them suitable as MACHOs comprising a significant mass fraction for dark matter. A necessary condition for the existence of these compact object solutions is that the single free parameter in the MEMe model is positive-valued. Additionally, we find that this positive sign for the parameter can provide a mechanism for suppressing the formation of (primordial) black holes from the gravitational collapse of matter below a certain mass scale. |
| title | Dust stars in the minimal exponential measure model |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics 83D99, 83C55 |
| url | https://arxiv.org/abs/2505.11591 |