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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...