New answers tagged dark-energy
2
votes
Formula for rate of expansion of the universe vs distance?
The relationship between proper distance and the rate of change of proper distance is Hubble's law. So
$$ v(r_0) = H_0 r_0 \ .$$
Note that $H_0$ is the Hubble parameter at the present epoch. The ...
5
votes
If w bosons can create dark matter neutrinos by decay, can they also create dark energy?
The W boson has a lifetime of $3\times 10^{−25}$ seconds. So any big bang W bosons will have long decayed. So they are not a dark energy source. Also, they produce "hot" relativistic decay ...
Top 50 recent answers are included
Related Tags
dark-energy × 107expansion × 32
cosmology × 29
dark-matter × 27
gravity × 15
universe × 15
cosmological-inflation × 9
redshift × 8
supermassive-black-hole × 7
general-relativity × 6
fate-of-universe × 6
galaxy × 5
observable-universe × 5
hubble-constant × 5
observational-astronomy × 4
black-hole × 3
light × 3
supernova × 3
space-time × 3
galaxy-cluster × 3
matter × 3
cosmic-microwave-background × 3
cosmological-horizon × 3
astrophysics × 2
space × 2