OpenAlex ·
Non-minimal unimodular inflation revisited: Swampland diagnostics and CMB constraints
- Published
- Source
- OpenAlex
- Published in
- arXiv (Cornell University)
- DOI
- 10.48550/arxiv.2610.27991
- Original
- Read it at the publisher
- Topics
Abstract
We study non-minimal unimodular inflation in the Einstein frame; the effective potential takes the form $U(φ)=U_0(1+ξφ^2/\mpl^2)^{-2}$. We consider the canonical field map and the inflationary observables directly from the Einstein-frame action. The exact potential slow-roll parameters, the leading scalar running, the scalar-amplitude normalization, the e-fold relation, and the end-of-inflation condition are obtained analytically. The model has a nontrivial structural tension: an $ε_V=1$ exit requires $ξ>1/2$, whereas the near-origin slow-roll regime requires $ξ\ll1$ and gives $n_s\simeq1-8ξ$. We next test three distinct swampland diagnostics. The further-refined de Sitter conjecture (FRDSSC) introduces the independent conjectural parameters $a$, $b$, and $q$, while the scalar weak gravity conjecture (SWGC) and its strong form (SSWGC) contain no analogous tunable conjecture parameter in the single-field realization adopted here. All three criteria are evaluated using the canonically normalized Einstein-frame scalar. Analytic limits show that the SWGC is violated at the stationary point for every nonzero $ξ$, whereas the SSWGC at that point requires $ξ\gtrsim0.0643$. In the large-field limit both scalar weak-gravity diagnostics reduce to the same threshold $ξ\ge0.1$. Numerical scans then show that the observationally relevant ACT/P-ACT region does not satisfy either scalar weak-gravity criterion, while the FRDSSC can be satisfied for $a$ close to unity. Consequently, the minimal model can reproduce acceptable $(n_s,r)$ at isolated field values, but this does not constitute a complete 50-60 e-fold inflationary history or simultaneous satisfaction of all three conjectures.
The authors’ abstract, as arXiv lists it. arXiv’s listings, abstracts included, are free for anyone to reuse.
Read it on ReadSearch
Each opens after you create an account, and brings you back to this paper.
More in Statistical Mechanics
Swampland diagnostics and observational tests of the inflationary universe in the Palatini formalism
Noise-Induced Restoration of Entropy Concavity Near Gaussian Equilibrium
Thermodynamics of coupled electromagnetic and mass fields
General relativity and its modifications as effective field theories of $GL(4)$ breaking
Analytic non-axisymmetric 3D MHD equilibria without stellarator symmetry
Get the few papers worth your time in Statistical Mechanics every morning.
ReadSearch reads the new papers in your field each day and brings you the few worth reading, each with its key finding in a sentence.