Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

near Planck's mass

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68434] near Planck's mass
  • From: Roger Bagula <rlbagula at sbcglobal.net>
  • Date: Sat, 5 Aug 2006 03:46:25 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Back about 1987 or before
 I was studying gravitation and quantum mechanics
and I came across  this:
(* Classical electromagnetic radius*)
r = e^2/(m*c^2)
(* Riemannian Curvature*)
R = -2/r^2
(* 3 space volume*)
V = (4*Pi/3)*r^3
(*scalar energy densidty*)
T = m*c^2/V
(* solution for R = -8Pi*G*T(v, v) : scalar reduction of Einstein's
        general relativity*)
Solve[R + (8*Pi*G/c^4)*T == 0, m]
e = 4.80325*10^(-10)
G = 6.6732*10^(-8)
(* mass in grams*)
m = e/Sqrt[3*G]
1.073513458510097`*10^-6

At the time I hadn't run into Planck's mass.
If you put in
 r=h/(m*c)
in this calculation  you get a version of the Planck mass.

I was wondering if this was a well known calculation like Planck's mass?
Roger


  • Prev by Date: Re: returning a variable's name, rather than the variable's contents
  • Next by Date: Re: How to treat this false singular point?
  • Previous by thread: How to do Chebyshev expansion in Mathematica?
  • Next by thread: Re: near Planck's mass