seminar 22 April

Boud Roukema cosmo-spotka at
Wed, 3 Apr 2002 13:09:43 +0200 (MET DST)

   Przepraszam dla spóżność ten abstrakt.


Title: Independent evidence that the universe is accelerating using
a cosmological standard ruler in a single survey (2QZ-10K)

Speaker: Boud Roukema

Time/place: 10:15, Mon 22 April 2002, Sala 20, Wydział Fizyki

According to standard Big Bang theory and observations, the Universe
is approximately static in comoving coordinates on large length
scales. Hence, a statistic of density perturbations on a large length
scale can function as a robust standard ruler for geometric
measurements.  This standard ruler technique has been applied to the 2
Degree Field Quasar Redshift Survey initial release (2QZ-10K),
yielding strong constraints on both the density parameter, \Omega_m
and on the cosmological constant, \Omega_\Lambda. The 95% confidence
limits are \Omega_m= 0.25\pm0.15, \Omega_\Lambda=0.60\pm0.35.