# Difference between revisions of "New Cosmography"

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First section of Cosmography

Problem 1

problem id: cs-1

Using the cosmographic parameters introduced above, expand the scale factor into a Taylor series in time.

Problem 2

problem id: cs-2

Using the cosmographic parameters, expand the redshift into a Taylor series in time.

Problem 3

problem id: cs-3

What is the reason for the statement that the cosmological parameters are model-independent?

Problem 4

problem id: cs-4

Obtain the following relations between the deceleration parameter and Hubble's parameter $$q(t)=\frac{d}{dt}(\frac{1}{H})-1;\,q(z)=\frac{1+z}{H}\frac{dH}{dz}-1\,q(z)=\frac{d\ln H}{dz}(1+z)-1$$

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