Back to the origins of brane–antibrane inflation
| Authors | |
|---|---|
| Year of publication | 2025 |
| Type | Article in Periodical |
| Magazine / Source | European Physical Journal C |
| MU Faculty or unit | |
| Citation | |
| web | https://doi.org/10.1140/epjc/s10052-025-13982-9 |
| Doi | http://dx.doi.org/10.1140/epjc/s10052-025-13982-9 |
| Keywords | High Energy Physics - Theory; Cosmology and Nongalactic Astrophysics; General Relativity and Quantum Cosmology |
| Attached files | |
| Description | We study a new framework for brane–antibrane inflation where moduli stabilisation relies purely on perturbative corrections to the effective action. This guarantees that the model does not suffer from the eta-problem. The inflationary potential has two contributions: the tension of an antibrane at the tip of a warped throat, and its Coulomb interaction with a mobile brane. This represents the first realisation of the original idea of brane–antibrane inflation, as opposed to inflection point inflation which arises when the moduli are fixed with non-perturbative effects. Moreover, we formulate the brane–antibrane dynamics as an F-term potential of a nilpotent superfield in a manifestly supersymmetric effective theory. We impose compatibility with data and consistency conditions on control over the approximations and find that slow-roll inflation can occur in a large region of the underlying parameter space. The scalar spectral index is in agreement with data and the tensor-to-scalar ratio is beyond current observational reach. Interestingly, after the end of inflation the volume mode can, but does not need to, evolve towards a late-time minimum at larger values. |
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