Pith. sign in

REVIEW 4 cited by

A Fake Instability in String Inflation

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2107.12392 v1 pith:DOFUJFTL submitted 2021-07-26 hep-th astro-ph.COgr-qchep-ph

Michele Cicoli , Veronica Guidetti , Francesco Muia , Francisco G. Pedro , Gian Paolo Vacca This is my paper · ORCID
classification hep-thastro-ph.COgr-qchep-ph
keywords inflationentropyfibreinstabilityisocurvatureperturbationsargueassociated
verification ladder T0 review T1 audit T2 compute T3 formal

Signed reviews

No signed human review yet.

0 comments
read the original abstract

In type IIB Fibre Inflation models the inflaton is a Kaehler modulus which is kinetically coupled to the corresponding axion. In this setup the curvature of the field space induces tachyonic isocurvature perturbations normal to the background inflationary trajectory. However we argue that the associated instability is unphysical since it is due to the use of ill-defined entropy variables. In fact, upon using the correct relative entropy perturbation, we show that in Fibre Inflation axionic isocurvature perturbations decay during inflation and the dynamics is essentially single-field.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Disentangling Similarity and Relatedness in Topic Models

    cs.CL 2026-03 unverdicted novelty 7.0 of 10

    Topic models lie on a spectrum from thematic-relatedness-rich to similarity-rich, and that position predicts which downstream tasks they handle well.

  2. Spectator Axions in String Inflation and Primordial Black Holes

    hep-th 2026-07 conditional novelty 6.0 of 10

    In Fibre Inflation, spectator axions with f≲0.1 M_Pl leave the PBH power spectrum unchanged, while for f≳0.1 M_Pl and exponentially small non-perturbative prefactors they can raise P_R from 1.9e-4 to 3.5e-3 and enable...

  3. Ultra slow-turn inflation

    hep-th 2026-03 conditional novelty 6.0 of 10

    In slow-roll multi-field inflation, stability should be read from the total entropy perturbation, which decays in 'ultra slow-turn' models even when the isocurvature effective mass-squared is negative.

  4. Double Exponents in $SL(2,\mathbb{Z})$ Cosmology

    hep-th 2024-12 conditional novelty 6.0 of 10

    During inflation in SL(2,Z) invariant α-attractor models, the axion field is frozen by a double-exponentially suppressed potential, so inflation is effectively single-field and the standard α-attractor predictions hold.

Pith tools