Author/Authors :
Ph. Brax، نويسنده , , C. van de Bruck، نويسنده , , A.C. Davis، نويسنده , , C.S. Rhodes، نويسنده ,
Abstract :
The behaviour of the distance between two branes (the ‘radion’) in a brane-world model with a bulk scalar field is investigated. We show that the BPS conditions of supergravity ensure that the dynamics of the scalar field and the radion are not independent; we derive the four-dimensional effective action, showing that the effective theory is of scalar–tensor nature, coupling the radion to four-dimensional gravity.
