E6 Unification and the Hidden Sector of the Universe
  A talk presents a new cosmological model with superstring-inspired $E_6$ unification, broken at the early stage of the Universe into $SO(10)\times U(1)_Z$ -- into the ordinary world, and $SU(6)'\times SU(2)'_{\theta}$ -- into the hidden world. 
C.R. Das, L.V. Laperashvili, H.B. Nielsen, A. Tureanu
hep-ph astro-ph.CO hep-th