Tuesday, March 25, 2014

Dimensional Analysis and BICEP2

Professor Craig J. Hogan claims that one cannot use localized concepts of field theory, to explain the recent BICEP2 observations. According to Hogan (note below), it is more appropriate to understand the results with an idea expressed before, by James Bjorken, and other scientists, that the scale of nuclear physics, could be used to calculate the vacuum fluctuations of the universe. Hogan calls it emergence of locality, and the scale is that of the QCD vacuum.

I do not follow Hogan line of argument, but my take away is: It is important to calculate the acceleration of the universe, which supposedly was found in 1998, by Filippenko's spectroscopic measurements of the High-z, and the SCP groups.

Hogan writes:

"..a gravitational atom of two neutrons happens to be almost as large as the current Hubble length."

I understand this as saying that based on his dimensional analysis, two neutrons moving around each other only with their gravitational force,  would be bound in an object as big as the universe.

Besides Bjorken, the other scientists expressing similar ideas are: Dirac, Eddington, and Weyl.

I thought it was going to be easy to understand the observations of BICEP2. In any case,  there are now many theoretical papers as a result. I haven't seen a single author though, withdrawing his proposal based on the new measurements.

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