The radion dynamics related to the presence of moving branes with both positive or negative ten- sions is studied in the linearized approximation. The radion effective Lagrangian is computed for a compact system with three branes and in particular we examine the decompactification limit when one brane is sent to infinity. In the non-compact case we calculate the coupling of the gravitational modes (graviton, dilaton and radion) to matter on the branes. The character of gravity on the two branes for all possible combinations of brane tensions is also discussed. It turns out that one can have a normalizable dilaton mode even in the non-compact case. Finally, we speculate on the role of mov- ing branes as a possible source of radion emission.

RADION IN MULTIBRANE WORLD

PILO, LUIGI
2002-01-01

Abstract

The radion dynamics related to the presence of moving branes with both positive or negative ten- sions is studied in the linearized approximation. The radion effective Lagrangian is computed for a compact system with three branes and in particular we examine the decompactification limit when one brane is sent to infinity. In the non-compact case we calculate the coupling of the gravitational modes (graviton, dilaton and radion) to matter on the branes. The character of gravity on the two branes for all possible combinations of brane tensions is also discussed. It turns out that one can have a normalizable dilaton mode even in the non-compact case. Finally, we speculate on the role of mov- ing branes as a possible source of radion emission.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/20992
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