"Tarop" <taropyoyo@yahoo.com> wrote in message
news:1147564381.626468.312550@j73g2000cwa.googlegroups.com...
| Hi,
|
| How did they calculate the value of vacuum energy density? Did
| they use quantum field theory alone or did they take into account
| the early universe vaccum conditions of the Big Bang model? I
| know the calculations is more than 120 magnitude greater than
| that observed... the worse fine tuning case in all of physics. I'm
| asking this because according to the cyclic universe theory
| authors, what they did is re-adjust the vacuum conditions of
| the early universe and they didn't come up with 120 magnitude
| but the right one so it seems that the 120 magnitude calculations
| is based on the vacuum conditions in the early universe? How
| is the calculations done?

See Milonni's book "The Quantum Vacuum..." or Volovik's book, "The
Universe in a Helium Droplet". The "vacuum" energy density that you are
speaking of is for the quantum "vacuum" bosonic content. As it turns
out, it is cancelled out by the quantum "vacuum" fermionic content which
ends up negative. According to the two authors. The result of the
caculation for bosonic content is this,

rho_o(w) = hbar*w^3/(2pi^2*c^3)

Where rho_o(w) is the spectral energy density as a function of w,
angular frequency, hbar is the reduced Planck constant, and c is the
speed of light. To get the energy density within a range you integrate
this from w1 to w2. Which ends up being,

hbar(w2^4 - w1^4)/(8pi^2*c^3)

In the range of visible light from 400 nm to 700 nm, this is about 220
erg/cm^3 or about 1.37E8 MeV/cm^3. Quite a bit of energy in that
centimeter cubed just in the visible light range! ;-) Take w1 to be
zero and w2 to be at the Planck scale and you will get your 120 orders
of magnitude.

I suspect that the bosonic content is just what the quantum "vacuum"
energy density could be as a maximum and that the quantum "vacuum"
doesn't really have the bosonic energy density content. So that leaves
us with the dilemma of the negative fermionic content. Solution...
shove it into another spacetime that is partially intersecting with
ours. A modified Dirac Sea that can work. If interested you can read
more about it at the links below. Be sure to see also,

http://www.arxiv.org/abs/physics/0601110

FrediFizzx

http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.pdf
or postscript
http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.ps

http://www.vacuum-physics.com