High Quality Content by WIKIPEDIA articles! In general relativity, a lambdavacuum solution is an exact solution to the Einstein field equation in which the only term in the stress-energy tensor is a cosmological constant term. This can be interpreted physically as a kind of classical approximation to a nonzero vacuum energy. However, it is more sensible to move the extra term to the right hand side and absorb it into the stress-energy tensor, so that the cosmological constant term becomes just another contribution to the stress-energy tensor. When other contributions vanish, The idea of the vacuum having an energy density might seem outrageous, but this does make sense in quantum field theory. Indeed, nonzero vacuum energies can even be experimentally verified in the Casimir effect.

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