Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-06-07
Nucl.Phys. B493 (1997) 73-100
Physics
High Energy Physics
High Energy Physics - Theory
46 pages, uses phyzzx.tex macros, no figures
Scientific paper
10.1016/S0550-3213(97)00129-6
We reconsider the issue of large-volume compactifications of the heterotic string in light of the recent discoveries about strongly-coupled string theories. Our conclusion remains firmly negative with respect to classical compactifications of the ten-dimensional field theory, albeit for a new reason: When the internal sixfold becomes large in heterotic units, the theory acquires an additional threshold at energies much less then the naive Kaluza-Klein scale. It is this additional threshold that imposes the ultimate limit on the compactification scale: Any compactification must have M_{Kaluza Klein} > 4*10^7 Gev; for most compactifications, the actual limit is much higher. (Generically, M_{Kaluza Klein} > alpha_{GUT} M_{Planck} in either SO(32) or E_8*E_8 heterotic string.)
Caceres Elena
Kaplunovsky Vadim S.
Mandelberg Michael I.
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