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Abstract  The existence of a new kind of  massive boson‐fermion symmetry  is shown explicitly in the framework of the heterotic, type II and type II orientifold superstring theories. The target space‐time is two‐dimensional. Higher dimensional models are defined via large marginal deformations of J J ‐type. The spectrum of the initial undeformed two dimensional vacuum consists of massless boson degrees of freedom, while all massive boson and fermion degrees of freedom exhibit a new Massive Spectrum Degeneracy Symmetry (MSDS). This precise property, distinguishes the MSDS theories from the well known supersymmetric SUSY‐theories. Some proposals are stated in the framework of these theories concerning the structure of: (i) The Early Non‐singular Phase of the Universe, (ii) The two dimensional boundary theory of AdS 3  Black‐Holes, (iii) Plausible applications of the MSDS theories in particle physics, alternative to SUSY.

Massive boson‐fermion degeneracy and the early structure of the universe