Difference between revisions of "New Cosmography"

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What is the reason for the statement that the cosmological parameters are model-independent?
 
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     <p style="text-align: left;">The cosmographic parameters are model-independent quantities for the simple reason: these parameters are not functions of the EoS parameters $w$ or $w_{i} $ of the cosmic fluid filling the Universe in a concrete model.</p>
 
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Obtain the following relations between the deceleration parameter and Hubble's parameter
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$$q(t)=\frac{d}{dt}(\frac{1}{H})-1;\,q(z)=\frac{1+z}{H}\frac{dH}{dz}-1\,q(z)=\frac{d\ln H}{dz}(1+z)-1$$
 
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Revision as of 23:52, 1 February 2016

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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