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Inflaton fragmentation in E-models of cosmological $\alpha$-attractors

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arxiv 1710.07487 v2 pith:CFIN32US submitted 2017-10-20 astro-ph.CO hep-ph

Fuminori Hasegawa , Jeong-Pyong Hong This is my paper · ORCID
classification astro-ph.COhep-ph
keywords alphaattractorsinflatoncosmologicale-modelsflatnessi-ballsnegative
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abstract

Cosmological $\alpha$-attractors are observationally favored due to the asymptotic flatness of the potential. Since its flatness induces the negative pressure even after inflation, the coherent oscillation of the inflaton field could fragment into quasi-stable localized objects called I-balls (or "oscillons"). We investigated the possibility of I-ball formation in E-models of $\alpha$-attractors. Using linear analysis and the lattice simulations, we find that for $\alpha\lesssim10^{-3}$, the inflaton feels the negative pressure long enough and actually fragments into I-balls.

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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. CosmoLattice 2.0

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    CosmoLattice v2.0 extends lattice cosmology simulations with non-minimal scalars, ALP–gauge couplings, defect networks, low-storage RK integrators, optimized GWs, and O(10) GPU speedups.

  2. Ephemeral Oscillons in Scalar-Tensor Theories: The Higgs-like case

    hep-ph 2025-01 conditional novelty 6.0 of 10

    In a Higgs-like Einstein-Cartan inflation model, oscillons formed after inflation are short-lived and their decay drives radiation domination within about four e-folds.

  3. Fragileness of Exact I-ball/Oscillon

    hep-ph 2019-08 conditional novelty 6.0 of 10

    Exact I-ball/oscillons, despite exactly conserving their adiabatic invariant, are fragile: small perturbations grow in Floquet resonance bands and break the configuration into a smaller one.

  4. The art of simulating the early Universe. Part III: Scalar-Gauge-Fluid Dynamics

    astro-ph.CO 2026-07 accept novelty 5.0 of 10

    Detailed continuum-to-lattice schemes are given for perfect/imperfect fluids alone or coupled to scalars/gauges in FLRW, enabling self-consistent CosmoLattice simulations of early-Universe plasma dynamics and GWs.

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