Cosmological Evolution of Degenerate Vacua
Oct 14, 198616 pages
Published in:
- Nucl.Phys.B 282 (1987) 610-625
- Published: 1987
Report number:
- Print-86-1238 (CAMBRIDGE)
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Abstract: (Elsevier)
Currently interesting higher-dimensional theories have degenerate ground state spacetimes of the form Minkowski spacetime (M d ) times a compact space (B n ). The degeneracy arises because neither the size nor the shape of B n is determined by the classical field equations. The size and shape parameters define a moduli space and we show that all d -dimensional Friedmann-Robertson-Walker cosmologies correspond to geodesic motion in this moduli space. If the universe is open and expands forever, this motion is damped and at late times the D = ( d + n )-dimensional universe tends to M d × B n where the metric on B n is time independent. Inflation is not possible in scale invariant theories, but we indicate how a breakdown in scale invariance at the quantum level could lead to inflation. We also discuss some bizarre aspects of the global structure of some of the D -dimensional cosmologies.- COSMOLOGICAL MODEL
- Kaluza-Klein model
- SCALING: VIOLATION
- FIELD THEORY: SPACE-TIME
- FIELD THEORY: HIGHER-DIMENSIONAL
- FIELD THEORY: compactification
- BOUNDARY CONDITION
- SUPERGRAVITY
- MODEL: INFLATION
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