Question

Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology and to you? Consider expansion rate and age.

What would be different about our universe if the Hubble Constant were doubled from its current value?

How do these constants factor into the geometry of spacetime?

How have these constants changed throughout the lifetime of the universe? Are they still changing? Cite some evidence to support your claims.

Please type answer, last persons handwriting was not readable

Answer 1

1) Hubble laws same added by a that galaxies more away from each other at a speed proportional to their distance.It is in the basis of for confirming that universe is expending.

v=hd,v=velocity,d =distance, h=Hubble constant,h=16010^6ly

H is helps to estimate the size and age of the universe to comological is an extra term added in working out the relation of general relatively that discribe the universe in the static case this term is added to avoid the universe collapse upon itself,it balance the attractive force of gravity contributed by all of the matter in the universe. Physically it supernts vaccume energy ,the possibolity the empty space posses density and pressure ,the preventing the universe from corresponding.

if homes law <1,the universe is open and ill expand foerver

if homes law >1, the universe is closed and then eventually half its expansion and re collapse.

if homes law =0, then universe is flat and contains enough matter to half the expansion but not to re collapse it.

2)If Humbble constant was doubled,the recession speed will double i.; universe is expending more rapeidely.

3) comlogical constant Discribes energy density of vaccume it is a property of space time and is same every where similarly ,humbble constant and density parameter are same everyhere.

4)   Density parameter is close to 1, so it is does not change if it is not close to 1, it would have changed with constant changes with time .current best value of H0 is 73.3km/mpc with 3% un certainty . the slope speed to change ,is not constant .

cosmological constant is ^in equation Guv+^Guv=8phieTuv it is constant it is geometrical property the universe .^eff= ^+Svac, though it is constant there is no way to verity it.