2001/10/31 by G. Veneziano · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1088/1126-6708/2002/06/051
published as JHEP 0206 (2002) 051 · 8 pages, Latex, minor modifications in notations and references
arxiv created 2002/03/12 · arxiv updated 2009/11/30
In a toy model of gauge and gravitational interactions in D ≥ 4 dimensions, endowed with an invariant UV cut-off Λ, and containing a large number N of non-self-interacting matter species, the physical gauge and gravitational couplings at the cut-off, αg ≡ g2 ΛD-4 and αG ≡ GN ΛD-2, are shown to be bounded by appropriate powers of 1\over N. This implies that the infinite-bare-coupling (so-called compositeness) limit of these theories is smooth, and can even resemble our world. We argue that such a result, when extended to more realistic situations, can help avoid large-N violations of entropy bounds, solve the dilaton stabilization and GUT-scale problems in superstring theory, and provide a new possible candidate for quintessence.