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VOLUME 68 (1998) | ISSUE 10 | PAGE 721
How to determine an effective potential for a variable cosmological term
PACS: 98.80.Es, 98.80.Hw
It is shown that if a variable cosmological term in the present Universe is described by a scalar field with minimal coupling to gravity and with some phenomenological self-interaction potential V(ip), then this potential can be unambiguously determined from the following observational data: either from the behaviour of density perturbations in dustlike matter component as a function of redshift (given the Hubble constant additionally), or from the luminosity distance as a function of redshift (given the present density of dustlike matter in terms of the critical one).