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Absence of ground state for the Nelson model on static space-times
Quantum field theory Nelson model static space-times ground state
2011/1/21
We consider the Nelson model on some static space-times and investigate the problem of absence of a ground state. Nelson models with variable coefficients arise when one replaces in the usual Nelson m...
Classi¯cation of cylindrically symmetric static space-times according to their proper homothetic vector ¯elds
proper homothetic vector ¯ elds direct integration technique
2009/1/7
A complete classi¯cation of cylindrically symmetric static space-
times according to their proper homothetic vector ¯eld is given by using
direct integration technique. Using the above men...
Ricci Collineations of Static Space Times with Maximal Symmetric
Transverse Spaces
Ricci collineations exact solutions of Einstein field equations
maximal symmetric spaces
2007/8/15
2006Vol.45No.1pp.95-104DOI:
Ricci Collineations of Static Space Times with Maximal Symmetric
Transverse Spaces
M. Akbar and CAI Rong-Gen
Institute of Theoretical Physics...