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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.23263 |
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| _version_ | 1866917359731605504 |
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| author | Mu, Chengsheng Tian, Shuxun Cao, Shuo Zhu, Zong-Hong |
| author_facet | Mu, Chengsheng Tian, Shuxun Cao, Shuo Zhu, Zong-Hong |
| contents | Vacuum energy, a prediction of quantum field theory, manifests itself as a cosmological constant in general relativity. In this Letter, we propose a novel inflationary scenario driven by a bare cosmological constant $Λ$, which terminates naturally through a self-tuning mechanism. Within Fab-Four gravity, self-tuning destabilizes the de Sitter state and drives the system toward a stiff-fluid attractor, thereby yielding a graceful exit. We construct two explicit models in which the slow-roll parameter evolves exponentially or as a power law. We show that the latter model, derived from center-manifold dynamics, significantly relaxes the required tuning of initial conditions. Our results establish, for the first time, that bare-vacuum-energy inflation with natural termination constitutes a viable dynamical possibility. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_23263 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inflation driven by a bare cosmological constant and its graceful exit Mu, Chengsheng Tian, Shuxun Cao, Shuo Zhu, Zong-Hong General Relativity and Quantum Cosmology Vacuum energy, a prediction of quantum field theory, manifests itself as a cosmological constant in general relativity. In this Letter, we propose a novel inflationary scenario driven by a bare cosmological constant $Λ$, which terminates naturally through a self-tuning mechanism. Within Fab-Four gravity, self-tuning destabilizes the de Sitter state and drives the system toward a stiff-fluid attractor, thereby yielding a graceful exit. We construct two explicit models in which the slow-roll parameter evolves exponentially or as a power law. We show that the latter model, derived from center-manifold dynamics, significantly relaxes the required tuning of initial conditions. Our results establish, for the first time, that bare-vacuum-energy inflation with natural termination constitutes a viable dynamical possibility. |
| title | Inflation driven by a bare cosmological constant and its graceful exit |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.23263 |