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Dilaton-Axion Inflation with PBHs and GWs

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arxiv 2203.10437 v1 pith:NIFEAUCV submitted 2022-03-20 hep-th astro-ph.COgr-qc

Renata Kallosh , Andrei Linde This is my paper · ORCID
classification hep-thastro-ph.COgr-qc
keywords alphaattractorinflationmodelsapproachblackdilaton-axionmodel
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abstract

We discuss two-stage dilaton-axion inflation models [1] and describe $\alpha$-attractor models with either exponential or polynomial approach to the plateau. We implement one of the models of primordial black hole production proposed in [2] in the $\alpha$-attractor context, and develop its supergravity version. The predictions of this model following from its polynomial attractor properties are: $n_s$ and $r$ are $\alpha$-independent, $r$ depends on the mass parameter $\mu$ defining the approach to the plateau. The tachyonic instability at the transition point between the two stages of inflation is proportional to the negative curvature of the hyperbolic space $\mathcal{R}_K=-2/3\alpha$. Therefore the masses of primordial black holes (PBHs) and the frequencies of small-scale gravitational waves (GWs) in this model show significant dependence on $\alpha$.

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Cited by 4 Pith papers

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

  1. Spacetime of rotating black holes surrounded by massive scalar charges

    gr-qc 2026-02 conditional novelty 6.0 of 10

    Spectral methods construct leading-order spinning black-hole spacetimes with massive scalar hair for spin a≤0.8 and scalar mass µ≤0.2/M.

  2. Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA

    astro-ph.CO 2025-01 conditional novelty 6.0 of 10

    LISA can reconstruct the primordial curvature power spectrum from scalar-induced gravitational waves, with percent-level precision near the peak and Bayesian tests separating SIGWs from other sources.

  3. Testing inflation on all scales: a case study with $\alpha$-attractors

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    A subset of hybrid alpha-attractor inflation models passes all large- and small-scale constraints and predicts scalar-induced gravitational waves detectable by LISA.

  4. The BAO-CMB Tension and Implications for Inflation

    astro-ph.CO 2025-07 accept novelty 5.0 of 10

    The upward shift in the scalar spectral index n_s in CMB+BAO analyses is driven by the combined effects of a known CMB degeneracy and the tension between CMB and DESI BAO data, not by new information about n_s itself.

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