Unformatted text preview: q depends on Ω m, , Ω q, , and the w for the dark energy, determine how m − M depends on w and z . If w is constant, then its value is determined by measuring distance moduli for one set of supernovae at small z (where the q dependence is negligible) and another set at, say, z = 0 . 5. Explain why we need supernovae at both small and large z . The distance modulus to an individual type Ia supernova can be measured with an accuracy of ± . 15 mag. How many supernovae must be measured, equally divided between small z and z = 0 . 5, to determine w for the dark energy to ± . 01? Assume that there are no systematic errors, so that the uncertainty in the average distance modulus of a group of supernovae is determined only by the number of supernovae contributing to the average. 3. Ryden problem 8.1 4. Ryden problem 8.3...
View
Full Document
 Fall '08
 Staff
 Dark Energy, Supernova, Physical cosmology, White dwarf, Type Ia Supernova

Click to edit the document details