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Astrophysical Constraints on Decaying Dark Gravitons

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arxiv 2307.11048 v3 pith:IOJWFFBS submitted 2023-07-20 hep-ph astro-ph.COhep-th

Jamie A.P. Law-Smith , Georges Obied , Anirudh Prabhu , Cumrun Vafa This is my paper
classification hep-phastro-ph.COhep-th
keywords darkdimensionmatterastrophysicalconstraintsextragravitonsmodel
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abstract

In the dark dimension scenario, which predicts an extra dimension of micron scale, dark gravitons (KK modes) are a natural dark matter candidate. In this paper, we study observable features of this model. In particular, their decay to standard matter fields can distort the CMB and impact other astrophysical signals. Using this we place bounds on the parameters of this model. In particular we find that the natural range of parameters in this scenario is consistent with these constraints and leads to the prediction that the mean mass of the dark matter today is close to a few hundred keV and the effective size of the extra dimension is around $1 - 30 \;\mu\mathrm{m}$.

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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. The Dark Dimension meets the Axiverse

    hep-ph 2026-07 conditional novelty 7.0 of 10

    Dark dimension dark matter can evade decay constraints if N≳50 axion KK towers share the tower energy, diluting Standard Model energy injection by roughly 1/N.

  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. Evolving Dark Sector and the Dark Dimension Scenario

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

    A two-parameter fading dark sector model, with exponential dark energy potential and exponential dark matter mass, matches DESI DR2 plus supernova data and naturally yields apparent w<-1 phantom behavior.

  4. 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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