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gr-qc2000
Brane Universe and Standard Cosmology
Yungui Gong
Brane cosmology takes the unconventional form . To recover the standard cosmology, we have to assume that the matter density is much less than the brane tension. We s…
gr-qc2000
Equivalent frames in Brans-Dicke theory
Yungui Gong
We discuss the physical equivalence between the Einstein and Jordan frames in Brans-Dicke theory. The inequivalence of conformal transformed theories is clarified with the help of…
hep-th2000
Ramond-Ramond Field Transformation
Yungui Gong
We find that the mixture of Ramond-Ramond fields and Neveu-Schwarz two form are transformed as Majorana spinors under the T-duality group . The Ramond-Ramond field transfor…