The Spacetime Metric
Tuesday, November 28, 2006
  too much noise
The most recent episode of Numb3rs featured the phrase "anthropic imbecile." It was spoken by the physicist on the show, Dr. Larry Fleinhardt, in reference to another physicist who had an unusual article published in an eminent- fictional- science journal.
I almost threw a fit, but... a few minutes later, Dr. Fleinhardt endorsed the article and announced that he would be "leaving the planet" on a mission to the International Space Station.
I suspect that most physicists who refer to their colleagues as "anthropic imbeciles" don't vacillate like that too often. The anthropic principle wasn't exactly the most popular subject at the cosmology colloquium. If nothing else, the anthropic principle doesn't make any less sense than multiverse theories or anything similar. The multiverse theories are what are "untestable", not string theory.
Here is a counterexample to a lie that gets circulated throughout physics:
I recently learned that if Q(psi) = q(psi), where capital Q is an operator acting on the wavefunction psi, and lowercase q is an eigenvalue... the ensemble average (expectation value) of capital Q is ALWAYS the same value. This is what it means to be in an eigenstate. Thus, the uncertainty in capital Q is 0. Thus also the idea of uncertainty in one quantity NECESSARILY changing the uncertainty in another gets... thrown out the window.

How long before another idea that's thought to always apply to everything (e.g. the uncertainty principle) gets counterexemplified?
Here's one: the constancy of the speed of light. Why does c have to be constant in vacuum? We know that optical pulses can be accelerated, or even brought to rest, without moving into a medium of a different index of refraction. The speed of light does not have to have one particular value for one particular medium, whether it's air, vacuum, or diamond. If VSL theory is correct (read Faster than the Speed of Light to learn the details), it will cause quite a paradigm shift. We already know that the other elementary constants aren't always constant; H (in cosmology) for example, while not known to great accuracy, has been changing, since the universe is expanding.
Who can say that the speed of light is the same in all reference frames? As odd as this may sound, it's not. From the reference frame of light itself, nothing is happening. Due to the equations of special relativity, which contain the denominator (1- v^2/c^2)^(1/2), if v=c, the denominator reaches 0. Time is not defined for photons. An observer standing on a photon (hypothetically) wouldn't notice anything, because time wouldn't exist for the observer. The observer couldn't measure the speed of everything outside the photon relative to the photon.
If you think that's hard to grasp, start thinking of tachyons. If they even exist, they would go backward in time and propagate with an imaginary velocity. Can we detect them? Probably not.
"THE THEORY OF TACHYONS IS UNTESTABLE! IT'S SO BAD, IT'S NOT EVEN WRONG!"
The Trouble with Tachyons: The Rise of the Imaginary, The Fall of 'Future', And What Comes Previous.
I can see the headlines and book titles right now...
 
Comments:
Riding on a Photon

Objects of Negative Orthodoxy... not mass

Tell the Anti-Anthropic idiots that the observed universe is anthropically constrained, until one of the morons proves otherwise.
 
http://www.lepp.cornell.edu/spr/2006-03/msg0073527.html

This topic is threaded off of the "Photons and Mass" thread, so I am bringing something in from that thread because I have often wondered, almost afraid to ask, what happens to the permittivity and permeability of free-space, and what effects that this would have if the following is accurate?:

[snip]

So, in context with what I quoted myself as saying, above, if we're talking about the vacuum as a real, finite object with the characteristics of negative mass, can massive objects achieve and exceed the speed of light in rarefied free-space?... since regions of space between massive clusters will "appear to be [relatively]free from special relativistic constraint"... in this particular case ?

Sure would explain lots of stuff.

 
Since the velocity of light is 1/sqrt(mu*epsilon), where mu and epsilon are the permeability and permittivity of a given material, I guess that if there were such a material through which light traveled faster than c, then the product of the permittivity and permeability would be less than that in free space. I'd like to know what the (complex) index of refraction of such a material would be. Someone has probably done those calculations, although it's going to take a while for them to show up in an optics textbook.
 
That's why I keep telling them that Einstein wasn't wrong. It's the reason that I persist when theorists can't disprove my obvious point:

The negative mass solutions are simply misapplied, as I said in the linked thread:

You get this same effect in Einstein's finite static model when you generate matter from Einstein's vaccum energy, because the gravitational acceleraton is only zero when the density of the *static* vacuum is exactly -0.5*rho(matter) because,

rho+3P/c^2=0

In the static state, pressure is proportional to -rho, but pressure is negative in an expanding universe, and so energy density is positive.

The viable research point that I consistently make about this is that Einstein did not know about particle potential in the quantum vacuum or he could have used this to reject arguements for an infinite universe, since matter generation drives expansion by way of vacuum rarefaction.

The vacuum energy density is less than the matter energy density, but it is still positive, and positive matter density can be obtained locally if you condense energy from this negative pressure vacuum into a fininte region of space, until the energy density over this region equals that of the matter density. This will, in-turn, cause negative pressure to
increase, via the rarefaction of Einstein's vacuum energy, so this
expanding universe does *not* run-away, because it is held stable and flate when the increase in "mass-energy" is offset by the increase in negative pressure that results when you make particles from Einstein's negative pressure energy.

Einstein didn't introduce the counter-balancing cosmological constant with matter generation from the vacuum in mind, and he didn't like it because he thought that it added an undesirable extra entity, so the logic that was used to reject the cosmological constant when it was discovered that the universe is expanding was sound in context with the knowledge of the time, but this is not the case given knowledge that the vacuum has particle potential.

Doesn't this represent a plausible unification of GR and QM via the
Dirac Equation?

I would like to know what happens when you write down the basis of wave functions in this background, including an expansion of the field in corresponding creation and annihilation operators - compute the stress-energy tensor in that background - quantitatively describe the
vacua - and then work out the matrix elements of the stress-energy tensor between the vacuum and the one-particle states.

 
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A cosmological blog designed to prevent crackpots from ruining professional physics blogs.

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Location: Ocean County, NJ / Rensselaer County, NY, United States

I am an undergraduate at RPI (Rensselaer Polytechnic Institute). I enjoy reading physics blogs because I am working toward becoming a physicist. One of my objectives is to increase scientific literacy, which will prevent crackpots from attacking eminent physics blogs.

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