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Questions related to Particle Physics
Permittivity of free space
04 April 2014 6,643 4 View
In a big bang cosmology there is a parameter called spectral index that measures deviation of scalar curvature perturbation from scale invariance. I want to know what is this invariance?
04 April 2014 7,553 4 View
I recently found a publication that states extruded nanoparticles of roughly 120nm with +/- 1.21nm. This converts to a PDI of roughly 0.00011. Is this reliable? Or even possible?
04 April 2014 7,412 2 View
Parks et al. [2012] found the entropy of electrons are increased across the Earth's bow shock. Based on the Vlasov equation or the entropy conservation equation, the entropy of electrons are...
04 April 2014 2,899 5 View
Vacuum expectation value (VEV) of the Higgs scalar is responsible for fermion masses and also masses of the W+ W- and Z gauge bosons. Does it mean that the Higgs particle can extract energy out...
28 March 2014 2,337 10 View
Why can't the Higgs Boson particle establish a relationship between parameters describing small and large distance scales?
22 March 2014 8,875 2 View
Today, a paper appeared on arxiv, "Wormhole geometries supported by quark matter at ultra-high densities" (paper 1403.0771) which appears to claim the Color-Flavor-Locked (CFL) quark matter could...
05 March 2014 1,260 2 View
03 March 2014 7,640 11 View
I can't formally explain (or demonstrate) to myself in a theoretical way the fact that a massless charged particle cannot exist. I used several arguments (ex. interaction with em wave and energy...
03 March 2014 5,244 21 View
If I understand correctly, then any matrix can be diagonalized with real and +ve diagonal entries via a bi-unitary transformation. My question is, given a matrix, are the unitary matrices unique??...
03 March 2014 3,746 6 View
03 March 2014 4,783 2 View
03 March 2014 9,517 2 View
Over the years, many physicists have wondered whether the fundamental constants of nature might have been different when the universe was younger. If so, the evidence ought to be out there in the...
26 February 2014 3,977 10 View
I checked it online and the result I got is 1nm ~1micrometer. But does anyone know how reliable if I get result ranging 1~5 nm for nanoparticle samples? Thanks!
18 February 2014 1,876 15 View
Consider attempting to determine the combined velocity of a small object (on earth). There is the velocity of our galaxy cluster (relative to other clusters), the velocity of our galaxy (relative...
18 February 2014 6,280 37 View
If density perturbations are scale invariant then the dependence should be more like k^0, where k is the wave number. Then why do we define that scale invariant perturbations has spectral index 1....
15 February 2014 5,030 2 View
We know in U 238 either alpha decays or proton decays. In heavy nuclei the element must decay by emit alpha but in 238 it does not. Why?
07 February 2014 6,882 7 View
And why?
02 February 2014 5,218 0 View
I have plans to start a collaboration with bunch of particle and theoretical physicists. The target is to demonstrate that particle annihilation is possible just by manipulating two particles spin...
02 February 2014 9,437 58 View
02 February 2014 1,260 11 View
02 February 2014 5,668 16 View
02 February 2014 1,806 38 View
02 February 2014 8,426 2 View
02 February 2014 5,100 8 View