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Is there a conflict between measurements of the cosmological constant
from gravitational lensing statistics and from other cosmological tests?
Phillip Helbig (NRAL)
Recently, several cosmological tests, particularly those based on the
m-z relation for Type Ia supernovae and on the interpretation of
fluctions in the CMB, have suggested that the cosmological constant is
positive. Combined with other well-accepted cosmological tests, such as
those which measure the density parameter directly, the case for a
positive cosmological constant is even stronger. Traditionally, lensing
statistics has been seen as a cosmological test which, despite
occasional doubts, favours lower values of the cosmological constant. I
explore the extent to which there is a conflict, both in terms of the
data themselves and in their interpretation, and the extent to which a
conflict could be caused by systematic effects.
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