REVIEW 6 cited by
Dark Dimension Gravitons as Dark Matter
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We consider cosmological aspects of the Dark Dimension (a mesoscopic dimension of micron scale), which has recently been proposed as the unique corner of the quantum gravity landscape consistent with both the Swampland criteria and observations. In particular we show how this leads, by the universal coupling of the Standard Model sector to bulk gravitons, to massive spin 2 KK excitations of the graviton in the dark dimension (the "dark gravitons") as an unavoidable dark matter candidate. Assuming a lifetime for the current de Sitter phase of our universe of order Hubble, which follows from both the dS Swampland Conjecture and TCC, we show that generic features of the dark dimenson cosmology can naturally lead to the correct dark matter density and a resolution of the cosmological coincidence problem, where the matter/radiation equality temperature ($T\sim$ 1 eV) coincides with the temperature where the dark energy begins to dominate. Thus one does not need to appeal to Weinberg's anthropic argument to explain this coincidence. The dark gravitons are produced at $T\sim$ 4 GeV, and their composition changes as they mainly decay to lighter gravitons, without losing much total mass density. The mass of dark gravitons is $m_{\text{DM}}\sim 1-100$ keV today.
Forward citations
Cited by 6 Pith papers
-
The Dark Dimension meets the Axiverse
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.
-
Searching for the $N$-naturalness tower of neutrinos
Neutrino data rule out the Majorana realization of N-naturalness with up to 10^4 sectors and fine-tuning r ≥ 0.1, including the no-fine-tuning GUT benchmark.
-
The dark dimension, proton decay, and the length of the M-theory interval
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.
-
Testing CCC+TL Cosmology with Galaxy Rotation Curves
A covarying-coupling-constant cosmology with a locally varying parameter X is shown to reproduce the rotation curves of seven SPARC galaxies without dark matter, by fitting a single turn-off density parameter.
-
Evolving Dark Sector and the Dark Dimension Scenario
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.
-
Breaking Free from the Swampland of Impossible Universes through the DESI Portal
DESI data indicating evolving dark energy may allow string theory to describe observed universes without violating swampland constraints on constant dark energy.
Discussion (0). Sign in to comment.