MG11 
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Vacuum energy generating mechanisms in cosmic expansions with UV cutoffs

In expanding space-times with an ultraviolet cutoff, new comoving modes are continually being generated for each field, presumably each with ground state energy. Once generated, the ground state energy of a mode becomes diluted as its proper wavelength increases. The balance of the two effects can be nontrivial, depending on the way the new modes are being generated in concrete models depending, for example, on the effective dispersion relations.