parameters
Tag archives for parameters
What The Entire Universe Is Made Of, Thanks to Planck!
Posted by Ethan on March 21, 2013 
“Much later, when I discussed the problem with Einstein, he remarked that the introduction of the cosmological term was the biggest blunder he ever made in his life. But this “blunder,” rejected by Einstein, is still sometimes used by cosmologists even today, and the cosmological constant denoted by the Greek letter Λ rears its ugly…
On String Theory from a String Theorist
Posted by Ethan on April 18, 2008 Bret Underwood, a friend of mine from my time in Madison, WI, saw my post on String Theory, and took issue with my statement that it wasn’t testable. I’m still standing behind what I said, but let’s address what Bret has to say. I don’t understand your argument above for why string theory is untestable.…
WMAP results: Cosmology from the CMB
Posted by Ethan on March 6, 2008 The cosmic microwave background is the radiation left over from the big bang. It’s very uniform, 2.725 Kelvin everywhere. We’re moving with respect to it, so there’s a doppler shift, and we see that as a dipole moment in the Temperature. When we subtract that out, we see variations on the order of 30 microKelvins!…
