# Can spinfoam/LQG use a G at particle size?

1. Aug 25, 2007

### jal

Here is something to help.
There are some interesting calculations in this paper.
http://arxiv.org/PS_cache/arxiv/pdf/0708/0708.2590v1.pdf [Broken]
Hierarchy Problem, Dilatonic Fifth Force, and Origin of Mass
Y. M. Cho and J. H. Kim
20 Aug 2007
This is precisely the equation which has been proposed to resolve the hierarchy problem [5, 6], which shows that a large v can easily bring GP to the order of the elementary particle scale. Of course, in the popular dimensional reduction in which the (4+n)-dimensional space is treated as physical, the internal space can not assume a large scale because it has to be invisible at present energy scale. For this reason the size has often been assumed to be of the Planck scale, with v = 1 [3, 9, 10]. But we emphasize that a relatively large internal space has not been ruled out theoretically as well as experimentally [7, 13].

This tells that the hierarchy problem is closely related to the problem of the origin of mass. Moreover, this demonstrates that there is another mass generation mechanism other than the Higgs mechanism, a geometric mass generation through the curvature of space-time. Understanding the origin of mass has been a fundamental problem in physics. The geometric mass generation mechanism could provide a natural resolution to this problem.

Last edited by a moderator: May 3, 2017
2. Aug 28, 2007

### jal

Fred Doyle would have loved this.
http://arxiv.org/abs/0708.3288
The probability of inflation in Loop Quantum Cosmology
Authors: William Nelson
(Submitted on 24 Aug 2007)
p.3
When formulated in these terms the evolution equation (the Hamiltonian
constraint) is a discrete equation, with a discreteness scale given by aPl =
p/6lPl, where lPl is the Planck length and is the Barbero-Immirzi parameter.
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I can add that when using 6lPl the minimum surface area will be 24lPl (as per the bounce model and the minimum length model).
And when adding Lisa Randall or the calculations of Y. M. Cho and J. H. Kim
then Pl can becomes particle size.

Interestinggggg!!!!. Beginning!!!!
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