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HawkEye5220
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Homework Statement
I am given a model where for an accelerating universe the redshift changes according to the following equations (given in part b). For this model and assuming that H0=70km/s/Mpc, evaluate the change in redshift over 10 years, for a source at z=1 and the change in recession velocity
Homework Equations
rate of change is [itex]\frac{dz}{dt}[/itex]=H0(1+z)-H(z) where H(z) is the Hubble parameter
In this case I am considering a κ=0 universe with no cosmological constant, so H(z)=H0(1+z)3/2
The Attempt at a Solution
I know that the long way would be to take the integral of the [itex]\frac{dz}{dt}[/itex] formula from z=1 to z' over the entire time period. What I am wondering is, because of how minute the change would probably be is it acceptable to approximate this as:
Δz≈t1H0(1+z-((1+z)3/2)) where t1=10 years?
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