ASTROPHYSICAL IMPLICATIONS OF THE SUPERSTRING-INSPIRED E(6) UNIFICATION AND SHADOW THETA-PARTICLES (ABSTRACT)

We have developed a concept of parallel existence of the ordinary (O) and mirror (M), or shadow (Sh) worlds. E(6) unification, inspired by superstring theory, restores the broken mirror parity at the scale~10(18) GeV. With the aim to explain the tiny cosmological constant, we consider the breakings: E(6)1 SO(10) x U(1)z-in the O-world, and E'(6)'SU(6)'x SU(2)'(f)-in the Sh-world. We assume the existence of shadow f-particles and the low energy symmetry group SU(3)'(C) x SU(2)'(L) x SU(2)'(f) x U(1)'(Y) in the shadow world, instead of the Standard Model. The additional non-Abelian SU(2)'(f) group with massless gauge fields, 'thetons', has a macroscopic confinement radius 1/A'(f). The assumption that A'(f)- 2.3 ; 10(-3) eV explains the tiny cosmological constant given by recent astrophysical measurements. Searching for the Dark Matter (DM), it is possible to observe and study various signals of theta-particles.