Wednesday, May 11, 2016

Einstein Published Theory Of General Relativity 100 Years Ago Today

The details are here. The theory was presented at a conference presentation in November of 1915, but the paper was submitted in March of 1916 and was published on May 11, 1916. Astonishingly little has changed in the theory of gravity since then (there have been refinements and applications of it, but not many).

In other news, the LHC is up and running again after a weasel induced shutdown. Grad students have been put on weasel patrol to prevent a repeat of the shutdown.
For the nearest future, the plan is to have a few inverse femtobarns on tape by mid-July, which would roughly double the current 13 TeV dataset. The first analyses of this chunk of data should be presented around the time of the ICHEP conference in early August. At that point we will know whether the 750 GeV particle is real. Celebrations will begin if the significance of the diphoton peak increases after adding the new data, even if the statistics is not enough to officially announce a discovery. In the best of all worlds, we may also get a hint of a matching 750 GeV peak in another decay channel (ZZ, Z-photon, dilepton, t-tbar,...) which would help focus our model building. On the other hand, if the significance of the diphoton peak drops in August, there will be a massive hangover...

1 comment:

Tienzen said...

"...Astonishingly little has changed in the theory of gravity since then ..."
This is just for the blind and the deaf persons.
On June 2, 2016, there is an article ( ) reported the recent (2016) study done by (Adam G. Riess, Lucas M. Macri, Samantha L. Hoffmann, Dan Scolnic, etc.) which shows that the Local value of the Hubble Constant is about 9% higher than the Planck CMB data (2015) estimation.
The Local Value of the Hubble Constant: H0 (now, later universe) = 73.24 ± 1.74 km s−1 Mpc−1 The Planck CMB data (Using ΛCDM with Neff = 3) estimation: H0 (early universe) = 66.93 ± 0.62 km s−1 Mpc−1
The ratio {H0 (now)/H0 (old, CMB)} = {73.24/66.93} = 1.0942
So, H0 (now) is 9.4% higher than the H0 (old, at CMB).
This result implies that there is a ‘dark radiation’ (or Neff = 3.4) becoming dark energy and making the universe expanding faster than the CMB period.

This W = 9% dark radiation was predicted in the article . Over ten thousand persons have read this article. That is, over ten thousand persons do know that gravity theory has changed dramatically.