21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 22.3, Problem 22.3CYU
To determine

The two problems of cosmology which was solved by inflation.

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Explain what is meant by the term cosmological redshift, and contrast it with the Doppler shift that is observed when a luminous object recedes from an observer. From the defi- nition of redshift in terms of the observed and emitted wavelengths of photons, obtain an expression that relates redshift to the expansion factor of the Universe. Hence calculate the expansion factor of the Universe while a photon travels from a galaxy with redshift z = 1.
Explain why the cosmological principle requires that H0 must have the same value everywhere in space, but does not require that it be constant in time.
What mechanism can simultaneously solve both the flatness and horizon problems in cosmology?
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