Gravity and Lorentz Breakdown in Higher-Dimensional Theories and Strings
The gravitational phenomenology of theories compactified from higher dimensions is investigated. Emphasis is placed on the consequences in string theory of tensor-induced spontaneous breaking of the higher-dimensional Lorentz symmetry. The role played by this mechanism in causing a gravitational version of the Higgs effect and in compactification is studied. The phenomenology of compactified theories with massless modes is compared with experiment via an examination of non-leading but observable gravitational effects arising in the presence of a localized matter distribution. Further constraints from known cosmological features of the universe are presented. The results significantly constrain many theories involving extra dimensions in their perturbative regime. A mechanism is needed that leaves massless the physical spacetime components of the higher-dimensional metric while generating masses for other components. Some suggestions for overcoming this metric-mass problem are made.
KeywordsSpontaneous Breaking Massless Mode Newton Gravity Nonabelian Gauge Theory String Field Theory
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