A G_2G2-Holonomy Model for Late-Time Cosmic Acceleration in M-theory: Alleviating the Hubble Tension through Geometric Vacuum Energy
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arXiv
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| Format: | Preprint |
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2025
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| author | Radwan, Moustafa Amin M. |
| author_facet | Radwan, Moustafa Amin M. |
| contents | A framework is developed within an eleven-dimensional M-theory scenario where dynamical geometric moduli, originating from a $G_{\mathrm{2}}$-holonomy compactification, generate an evolving cosmological term, $Λ(z)$. This ``Geometric Vacuum Energy'' (GVE) is shown to be consistent across both cosmological and astrophysical scales. We demonstrate that a natural attractor solution alleviates the Hubble tension, yielding an inferred $H_0 \approx 69.4\ \mathrm{km}\,\mathrm{s}^{-1}\,\mathrm{Mpc}^{-1}$ and a suppressed structure growth parameter $S_8 \approx 0.67$, while remaining in excellent agreement with cosmic chronometer data ($χ^2/N \approx 0.44$). Its predictions in the strong-gravity regime profoundly strengthen the framework's self-consistency. We show that this model supports stable, hairy black hole solutions whose existence conditions are congruent with the cosmological attractor ($Φ_{\text{horizon}} \leftrightarrow Φ_{\text{cosmology}}$). Furthermore, these objects exhibit a rich, falsifiable phenomenology, including (i) the definitive breaking of isospectrality in their gravitational-wave quasi-normal modes, (ii) a suppressed Integrated Sachs-Wolfe effect, and (iii) unique thermodynamic and electromagnetic accretion signatures. These interconnected findings highlight a pathway where a single, theoretically-motivated framework can naturally reconcile multiple observational puzzles. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_06654 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A G_2G2-Holonomy Model for Late-Time Cosmic Acceleration in M-theory: Alleviating the Hubble Tension through Geometric Vacuum Energy Radwan, Moustafa Amin M. Cosmology and Nongalactic Astrophysics A framework is developed within an eleven-dimensional M-theory scenario where dynamical geometric moduli, originating from a $G_{\mathrm{2}}$-holonomy compactification, generate an evolving cosmological term, $Λ(z)$. This ``Geometric Vacuum Energy'' (GVE) is shown to be consistent across both cosmological and astrophysical scales. We demonstrate that a natural attractor solution alleviates the Hubble tension, yielding an inferred $H_0 \approx 69.4\ \mathrm{km}\,\mathrm{s}^{-1}\,\mathrm{Mpc}^{-1}$ and a suppressed structure growth parameter $S_8 \approx 0.67$, while remaining in excellent agreement with cosmic chronometer data ($χ^2/N \approx 0.44$). Its predictions in the strong-gravity regime profoundly strengthen the framework's self-consistency. We show that this model supports stable, hairy black hole solutions whose existence conditions are congruent with the cosmological attractor ($Φ_{\text{horizon}} \leftrightarrow Φ_{\text{cosmology}}$). Furthermore, these objects exhibit a rich, falsifiable phenomenology, including (i) the definitive breaking of isospectrality in their gravitational-wave quasi-normal modes, (ii) a suppressed Integrated Sachs-Wolfe effect, and (iii) unique thermodynamic and electromagnetic accretion signatures. These interconnected findings highlight a pathway where a single, theoretically-motivated framework can naturally reconcile multiple observational puzzles. |
| title | A G_2G2-Holonomy Model for Late-Time Cosmic Acceleration in M-theory: Alleviating the Hubble Tension through Geometric Vacuum Energy |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.06654 |