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<p>Universal cosmologies are exact solutions of 10d type IIA supergravity containing a 4d Friedmann-Lemaître-Robertson-Walker factor, that can also be repackaged as solutions of 4d models, i.e. as 4d consistent truncations. We extend the dynamical system analysis of universal cosmologies, beyond the case of a single exponential potential. For an open universe (negative 3d spatial curvature), these models generally possess many desirable features: parametric control of e-folds, late-time acceleration from potentials with steep exponentials (i.e. in accordance with swampland bounds), small string-loop and <i>α</i><sup>′</sup>-corrections, scale separation and/or absence of decompactification.</p>

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Universal cosmologies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月12日

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  • Paul Marconnet,
  • Dimitrios Tsimpis

摘要

Universal cosmologies are exact solutions of 10d type IIA supergravity containing a 4d Friedmann-Lemaître-Robertson-Walker factor, that can also be repackaged as solutions of 4d models, i.e. as 4d consistent truncations. We extend the dynamical system analysis of universal cosmologies, beyond the case of a single exponential potential. For an open universe (negative 3d spatial curvature), these models generally possess many desirable features: parametric control of e-folds, late-time acceleration from potentials with steep exponentials (i.e. in accordance with swampland bounds), small string-loop and α′-corrections, scale separation and/or absence of decompactification.