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Large extra dimensions from higher-dimensional inflation

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arxiv 2310.20282 v2 pith:DYSPCRAJ submitted 2023-10-31 hep-ph astro-ph.COhep-th

Luis A. Anchordoqui , Ignatios Antoniadis This is my paper · ORCID
classification hep-phastro-ph.COhep-th
keywords extrascaledimensionsenergyinflationlargepossibilitysize
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abstract

We propose the possibility that compact extra dimensions can obtain large size by higher dimensional inflation, relating the weakness of the actual gravitational force to the size of the observable universe. Solution to the horizon problem implies that the fundamental scale of gravity is smaller than $10^{13}$ GeV which can be realised in a braneworld framework for any number of extra dimensions. However, requirement of (approximate) flat power spectrum of primordial density fluctuations consistent with present observations makes this simple proposal possible only for one extra dimension at around the micron scale. After the end of five-dimensional inflation, the radion modulus can be stabilised at a vacuum with positive energy of the order of the present dark energy scale. An attractive possibility is based on the contribution to the Casimir energy of right-handed neutrinos with a mass at a similar scale.

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Cited by 5 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. Analysis of inflationary models in higher-dimensional uniform inflation

    hep-ph 2025-01 conditional novelty 5.0 of 10

    In (D+4)-dimensional uniform inflation the spectral index and tensor-to-scalar ratio are ns=1-(D+6)ε+2η and r=8(D+2)ε, which excludes D≥2 for the five models studied while allowing D=1 in the b0k >> 1 branch.

  3. Role of internal space correlations in the dynamics of a higher-dimensional Bianchi type-I universe: shear scalar and Hubble parameter perspectives

    gr-qc 2025-01 conditional novelty 5.0 of 10

    A constant correlation between external and internal expansion rates yields exact Bianchi type-I solutions whose effective dark energy mimics a cosmological constant at late times and a steady-state universe for negat...

  4. Multidimensional arrow of time

    gr-qc 2026-01 reject novelty 4.0 of 10

    The direction of time is claimed to be fixed by the exponentially growing entropy of expanding extra dimensions, which dominates every other entropy source in the universe.

  5. QCD Axion Dark Matter in the Dark Dimension

    hep-th 2024-12 conditional novelty 4.0 of 10

    A QCD axion with decay constant around 1e9 to 1e10 GeV, as predicted in the dark dimension scenario, can supply all dark matter if an ALP of mass about 1e-5 eV and decay constant about 1e11 GeV resonantly converts into it.

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