Cosmological constraints on theories with large extra dimensions

Apr, 1999
9 pages
Published in:
  • Phys.Rev.D 60 (1999) 085008
e-Print:
Report number:
  • LBNL-43091,
  • UCB-PTH-99-14,
  • LBL-43091

Citations per year

19992006201320202025010203040
Abstract:
In theories with large extra dimensions, constraints from cosmology lead to non-trivial lower bounds on the fundamental scale M_F, corresponding to upper bounds on the radii of the compact extra dimensions. These constraints are especially relevant to the case of two extra dimensions, since only if M_F is 10 TeV or less do deviations from the standard gravitational force law become evident at distances accessible to planned sub-mm gravity experiments. By examining the graviton decay contribution to the cosmic diffuse gamma radiation, we derive, for the case of two extra dimensions, a conservative bound M_F > 110 TeV, corresponding to r_2 < 5.1 times 10^-5 mm, well beyond the reach of these experiments. We also consider the constraint coming from graviton overclosure of the universe and derive an independent bound M_F > 6.5 h^(-1/2) TeV, or r_2 < .015 h mm.
  • cosmological model
  • space-time: higher-dimensional
  • mass: lower limit
  • photon: cosmic radiation
  • cosmic background radiation
  • graviton: radiative decay
  • graviton: width
  • Kaluza-Klein model
  • numerical calculations: interpretation of experiments