Five-branes in heterotic brane-world theories -: art. no. 064024

The effective action for five-dimensional heterotic M theory in the presence of five-branes is systematically derived from Horava-Witten theory coupled to an M5-brane world-volume theory. This leads to a five-dimensional N = 1 gauged supergravity theory on S-1/Z(2) coupled to four-dimensional N = 1 theories residing on the two orbifold fixed planes and an additional bulk three-brane. We analyze the properties of this action, particularly the four-dimensional effective theory associated with the domain-wall vacuum state. The moduli Kahler potential and the gauge-kinetic functions are determined along with the explicit relations between four-dimensional superfields and five-dimensional component fields.