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We study cosmological solutions in the context of 4-dimensional low energyHeterotic M-theory with moving bulk branes. In particular we presentnon-trivial, analytic axion solutions generated by new symmetries of the fullpotential-free action which are similar to 'triple axion' solutions found inPre-Big-Bang (PBB) cosmologies. We also consider the presence of anon-perturbative superpotential, for which we find cosmological solutions withand without a background perfect fluid. In the absence of a fluid the dilatonand the T-modulus go to the potential-free solutions at late time, while themoving brane tries to avoid colliding with the boundary and stabilize withinthe bulk. When the fluid is included, we find that the real parts of the fieldstrack its behaviour and that the moving brane gets stabilized at the middlepoint between the boundaries. In this latter case we can make analyticapproximations for the evolution of the fields whether or not axions areincluded and we consider the possibility of this set up being a realization ofthe quintessential scenario.Comment: 19 pages, 7 figures; revtex

Moving five-branes and membrane instantons in low energy heterotic M theory