THERMAL VACUUM RADIATION IN SPONTANEOUSLY BROKEN SECOND-QUANTIZED THEORIES ON CURVED PHASE SPACES OF CONSTANT CURVATURE

摘要

We construct second-quantized (field) theories on coset spaces of pseudo-unitary groups U(N_+,N_-). The existence of degenerated quantum vacua (coherent states of zero modes) leads to a breakdown of the original pseudo-unitary symmetry. The action of some spontaneously broken symmetry transformations destabilize the vacuum and make it to radiate. We study the structure of this thermal radiation for curved phase spaces of constant curvature: complex projective spaces CP~(N-1)=SU(N)/U(N _ 1) and open complex balls CD~(N-1) = SU(1, N-1)/U(N-1). Positive curvature is related to generalized Fermi_Dirac (FD) statistics, whereas negative curvature is connected with gen_eralized Bose_Einstein (BE) statistics, the standard cases being recovered for N = 2. We also make some comments on the contribution of the vacuum (dark) energy to the cosmological constant and the phenomenon of inflation.