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Brane Inflation
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We present a novel inflationary scenario in theories with low scale (TeV) quantum gravity, in which the standard model particles are localized on the branes whereas gravity propagates in the bulk of large extra dimensions. This inflationary scenario is natural in the brane world picture. In the lowest energy state, a number of branes sit on top of each other (or at an orientifold plane), so the vacuum energy cancels out. In the cosmological setting, some of the branes "start out" relatively displaced in the extra dimensions and the resulting vacuum energy triggers the exponential growth of the 3 non-compact dimensions. The number of e-foldings can be very large due to the very weak brane-brane interaction at large distances. In the effective four-dimensional field theory, the brane motion is described by a slowly rolling scalar field with an extremely flat plateau potential. When branes approach each other to a critical distance, the potential becomes steep and inflation ends rapidly. Then the branes "collide" and oscillate about the equilibrium point, releasing energy mostly into radiation on the branes.
Forward citations
Cited by 7 Pith papers
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TransPlanckian Censorship on Dark Dimension Inflation
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.
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Unification of polynomial and exponential cosmological attractors
Embedding polynomial attractor potentials within α-attractor geometry yields a unified model class that interpolates between exponential and polynomial inflationary predictions via a single parameter μ.
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DeepInflation: an AI agent for research and model discovery of inflation
An LLM agent with symbolic regression finds simple inflation potentials that match target CMB observables, but the outputs are fitted to the targets rather than independently predicted.
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Inflation, Open Universes, and Dark Energy
A slightly open universe with Ω_k ≈ 3×10^{-3} pulls n_s down to ~0.969, reconciling plateau inflation models with combined CMB and DESI data.
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The BAO-CMB Tension and Implications for Inflation
The upward shift in the scalar spectral index n_s in CMB+BAO analyses is driven by the combined effects of a known CMB degeneracy and the tension between CMB and DESI BAO data, not by new information about n_s itself.
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Cosmological history after higher dimensional inflation
Proposes a post-inflation cosmological evolution in large-extra-dimension models that prevents bulk graviton overproduction up to reheating while preserving scale-invariant perturbations for 1-2 micron-sized dimensions.
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Inflationary models in a minimally coupled $f(R,T)$ gravity: Constraints from $Planck$, BICEP/$Keck$, and ACT
Three standard inflationary potentials remain compatible with Planck, BICEP/Keck, DESI DR2, and ACT DR6 data when placed in minimally coupled f(R,T)=R+16πGλT gravity for suitable ranges of the model parameters and coupling λ.
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