Reheating without an inflaton: metriplectic relaxation of the vacuum structure in the Theory of Structural Articulation (TSA)
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| Formato: | Recurso digital |
| Lenguaje: | inglés |
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2026
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| _version_ | 1866901263191375872 |
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| author | Nett, Aleksandr |
| author_facet | Nett, Aleksandr |
| contents | <p>We propose a non-inflationary reheating scenario within the Theory of Structural Articulation (TSA), in which the early Universe undergoes a relaxation process governed by metriplectic dynamics rather than by scalar-field–driven inflation.</p> <p>Reheating is described as the dissipation of structural conflict in the vacuum network, leading to an entropy-driven expansion characterized by a universal power-law decay of excess energy, <span><span>E(t)∼t−1/5E(t) \sim t^{-1/5}</span><span><span><span>E</span><span>(</span><span>t</span><span>)</span><span>∼</span></span><span><span><span>t</span><span><span><span><span><span><span>−1/5</span></span></span></span></span></span></span></span></span></span>. This exponent emerges from geometric constraints of the articulation dynamics and does not rely on fine-tuning or slow-roll assumptions.</p> <p>The framework naturally explains several key cosmological features: (i) the absence of a primordial tensor background due to the dissipative nature of the process; (ii) near-Gaussian scalar perturbations as a consequence of entropy maximization; and (iii) a scalar spectral index consistent with observational data at leading order.</p> <p>Unlike inflationary models, the proposed mechanism does not require a fundamental inflaton field or a potential-dominated vacuum state. Instead, cosmological expansion and thermalization arise from structural relaxation of the vacuum itself.</p> <p>The scenario is predictive, falsifiable, and compatible with current observational constraints, providing an alternative pathway for reheating and early-Universe dynamics grounded in non-equilibrium statistical physics and topology.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18520598 |
| institution | Zenodo |
| language | eng |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Reheating without an inflaton: metriplectic relaxation of the vacuum structure in the Theory of Structural Articulation (TSA) Nett, Aleksandr Reheating Early Universe Non-inflationary cosmology Metriplectic dynamics Entropy-driven expansion Primordial perturbations Tensor suppression Theory of Structural Articulation Vacuum relaxation Nonequilibrium cosmology <p>We propose a non-inflationary reheating scenario within the Theory of Structural Articulation (TSA), in which the early Universe undergoes a relaxation process governed by metriplectic dynamics rather than by scalar-field–driven inflation.</p> <p>Reheating is described as the dissipation of structural conflict in the vacuum network, leading to an entropy-driven expansion characterized by a universal power-law decay of excess energy, <span><span>E(t)∼t−1/5E(t) \sim t^{-1/5}</span><span><span><span>E</span><span>(</span><span>t</span><span>)</span><span>∼</span></span><span><span><span>t</span><span><span><span><span><span><span>−1/5</span></span></span></span></span></span></span></span></span></span>. This exponent emerges from geometric constraints of the articulation dynamics and does not rely on fine-tuning or slow-roll assumptions.</p> <p>The framework naturally explains several key cosmological features: (i) the absence of a primordial tensor background due to the dissipative nature of the process; (ii) near-Gaussian scalar perturbations as a consequence of entropy maximization; and (iii) a scalar spectral index consistent with observational data at leading order.</p> <p>Unlike inflationary models, the proposed mechanism does not require a fundamental inflaton field or a potential-dominated vacuum state. Instead, cosmological expansion and thermalization arise from structural relaxation of the vacuum itself.</p> <p>The scenario is predictive, falsifiable, and compatible with current observational constraints, providing an alternative pathway for reheating and early-Universe dynamics grounded in non-equilibrium statistical physics and topology.</p> |
| title | Reheating without an inflaton: metriplectic relaxation of the vacuum structure in the Theory of Structural Articulation (TSA) |
| topic | Reheating Early Universe Non-inflationary cosmology Metriplectic dynamics Entropy-driven expansion Primordial perturbations Tensor suppression Theory of Structural Articulation Vacuum relaxation Nonequilibrium cosmology |
| url | https://doi.org/10.5281/zenodo.18520598 |