On the Masses of the Universal hypermultiplets in heterotic M-theory
  The reduced 5D Heterotic M-theory has a deeply rich structure. For every Calabi-yau compactification, there exists a gravitational hypermultiplet $(g_{\mu\nu},\psi_{\mu},A_{\mu})$ and a universal hypermultiplet. In this paper we derive the formulae for the masses of the scalar sector of the universal hypermultiplet $(V,\sigma,\zeta,\bar{\zeta})$ in the framework of 5D Heterotic M-theory. 
Nasr Ahmed
hep-th