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Landscape, Swampland, and Extra Dimensions

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arxiv 2405.04427 v2 pith:AJWRK7D7 submitted 2024-05-07 hep-th

classification hep-th
keywords darkcosmologicaldimensionenergyextraswamplandtheoryaspects
verification ladder T0 review T1 audit T2 compute T3 formal
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By combining swampland conjectures with observational data, it was recently suggested that the cosmological hierarchy problem (i.e. the smallness of the dark energy in Planck units) could be understood as an asymptotic limit in field space, corresponding to a decompactification of one extra (dark) dimension of a size in the micron range. In these Proceedings we examine the fundamental setting of this framework and discuss general aspects of the effective low energy theory inherited from properties of the overarching string theory. We then explore some novel phenomenology encompassing the dark dimension by looking at potential dark matter candidates, decoding neutrino masses, and digging into new cosmological phenomena.

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Cited by 3 Pith papers

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

  1. TransPlanckian Censorship on Dark Dimension Inflation

    hep-th 2026-07 conditional novelty 6.0 of 10

    TransPlanckian Censorship forces dark-dimension inflation into a narrow one-dimension window with a pre-inflationary phase and suppresses tensor modes to r < 10^-10.

  2. The dark dimension, proton decay, and the length of the M-theory interval

    hep-th 2025-10 conditional novelty 6.0 of 10

    Proton decay limits force the M-theory interval in heterotic E8×E8 compactifications to be R ≲ 2.7×10^-28 m, ruling it out as a micron-sized dark dimension.

  3. Breaking Free from the Swampland of Impossible Universes through the DESI Portal

    astro-ph.CO 2026-05 unverdicted novelty 3.0 of 10

    DESI data indicating evolving dark energy may allow string theory to describe observed universes without violating swampland constraints on constant dark energy.

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