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meneedit
Supreme tranceaddict
Registered: Dec 2001
Location:
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^bump. my thoughts exactly.
by the way, check your PM's EriK_V
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 Feb-10-2004 03:38 
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SuperFarStucker
1380 fp/s
Registered: Jan 2003
Location: Seattle, WA
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| quote: | Originally posted by whiskers
a high school physics degree? i want one!
i skimmed over that 'professor's' email reply...
" The Schwarzchild radius for the electron mass " - wtf is that? i'm sure he meant the Schwarzschild radius for a black hole - search for " The Schwarzchild radius for the electron mass " on google and you'll see how irrelevant that is
and to back up john titor, i think what he meant by "black hole being a size of an electron" is that a black hole's SINGULARITY is infinitely small but infinitely dense / heavy. remember, he claimed to be a soldier, so i wouldn't suppose him to completely understand the physics of this.
i'm not saying john titor's story was true or not, i'm just saying that what this 'professor' is saying about the Schwarzschild equation is flawed IMO. |
meaning the radius required for something with the mass of an electron to take on the properties of a blackhole.
| quote: | | For a body of a given mass, the radius beneath which that body's gravitational field will take on the properties of a Black Hole, preventing the escape of all matter and energy. The Schwarzchild radius represents an immensely compacted state - for example, it has been calculated that the Schwarzchild radius of the entire Earth is of the order of one centimetre. The forces required to collapse a body to this extent are such that only the most massive stars (far more massive than the Sun) have the potential to reach it. |
he used in this context:
| quote: | > If one assumes that the electron is a ball of uniform charge, and that
> the self-energy of all of this charge (bound together with some
> mythical charge-glue for which there isn't a shred of evidence to the
> best of my
> knowledge) is equal to the mass energy, then one gets (ignoring scalar
> factors of order unity and using "latex" to do ascii algebra, hopefully
> fairly clearly):
>
> \frac{ k e^2} {a} = m_e c^2
>
> which can be solved for a, the classical electron radius:
>
> a = \frac{k e^2}{m_e c^2} \approx 3 fm
>
> which is not at all coincidentally the same order as the size of the
> proton or the nucleus of your choice, which DOES confine a net charge
> of order e with a stronger attractive force but (consequently) has a
> much larger mass. The Schwarzchild radius for the electron mass is
> determined from a very similar computation (again neglecting scalar
> factors order unity)
>
> \frac{ G m_e^2} {r_s} = m_e c^2
>
> or
>
> r_s = \frac{G m_e^2}{m_e c^2} = \frac{G m_e}{c^2}
>
> which is number so tiny as to be meaningless (order 10^-57 meters,
> smaller than the Planck length and hence it IS meaningless).
>
> An amusing computation: Suppose r_s = 1 fm (somewhat smaller than "an
> electron"). Then m_BH = r_s*c^2/G, right? Plug 'n' chug. On my
> calculator, 10^-15 * 9x10^16/6.67x10^-11 \approx 10^12 kg. Let's see,
> that would be, um, a billion metric tons, the mass of a cube of water
> 1000 meters to the side (as 1000^3 = 10^9 and water conveniently
> masses a metric ton, 10^3 kg per cubic meter. How come nobody in your
> group actually did these simple computations?
>
> His suitcase contains TWO of these? He carried this suitcase on a 67
> Chevy? Man, they must put a hell of a suspension in those babies...
|
I guess what he is saying is that in order for something with the mass of an electron to create a singularity it needs to be smaller than the resolution of the known universe. I.E. the earth condenses down into 2 cm so something the size of an electron quite literally condenses into nothing.
I am not a physicist however so I might just be reading what he said wrong.
___________________
| quote: | Venus: And there are troops of savage giraffes whose necks are on fire, like
the starry ejaculations of fireworks in the very pale sky of childhood
...
Venus: Enter, enter here - men of all kinds and races, victims of reality!
You who have the thirst for dreams.
...
Venus: You, on life's bitter road, drenched in hard sunlight who have the
thirst that once more the dark marvel of dreams... |
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Feb-10-2004 05:01 
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CKYTEP
ObsceneDirtyFilthyImmoral
Registered: Mar 2001
Location: Nashville TN, USA orig. Moscow, Russia
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Feb-10-2004 10:06
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