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Cosmological solutions of Hořava-Witten theory
Physical Review D, Particles and fields
We discuss simple cosmological solutions of Horava-Witten theory describing the strongly coupled heterotic string. At energies below the grand-unified scale, the effective theory is five- not four-dimensional, where the additional coordinate parameterizes a S^1/Z_2 orbifold. Furthermore, it admits no homogeneous solutions. Rather, the vacuum state, appropriate for a reduction to four-dimensional supersymmetric models, is a BPS domain wall. Relevant cosmological solutions are those associateddoi:10.1103/physrevd.60.086001 fatcat:75zdstr7qzhdhaj374hj5u443m