Question

How can i derive the existence of dark matter from the law of conservation of energy ?

Answer 1

the outer rim of any galaxy rotates faster than the predicted model of objects revolving around an axis.this could be understood as a merry go round rotating faster at the edges..it means somebody has to push it in agreement with energy cons..that someone is the dark matter guy!

Answer 2

thanks but math please...

Answer 3

you don't agree?

Answer 4

i can't figure out the mathematical justification... i mean... with the conservation of enrgy where are the numbers saying me that there is dark matter.... can you put your answer in a mathematical form ?

Answer 5

I looked for the mathematical answer but I couldn't find it i do think I off to hit the books to see whay I can find

Answer 6

"we loosen the zero equation of state of dark matter to a constant wdm. By using the currently available cosmic observations, which include the type-Ia supernovae, the baryon acoustic oscillation, the WiggleZ measurements of matter power spectrum, and the cosmic microwave background radiation from the firs release of Planck data through the Markov chain Monte Carlo method, we found the equation of state of dark matter in 3σ regions: wdm=0.000707+0.000746+0.00146+0.00193−0.000747−0.00149−0.00196. The difference between the minimum of χ2 between the ΛCDM and ΛwDM models is Δχ2min=0.446 for one extra model parameter wdm. Although the currently available cosmic observations favor the ΛwDM mildly, no significant deviation from the ΛCDM model is found in 1σ regions."
-© 2013 American Physical Society
I know this might not be much but I think this should help its from http://link.aps.org/doi/10.1103/PhysRevD.88.127301