Text Size

Stardrive

However, it looks as though we need H ~ Gm/c^2 ~ 10^-56 cm to get T > 2mc^2 and this is problematical since it's much smaller than the Planck length Lp ~ 10^-33 cm.


It depends how close you are to it as a static LNIF.

Here is one important idea that Nick got hung up on.
The Newtonian surface gravity is
gNewton = c^2rs/r^2 ---> c^2/rs
rs = 2GM/c^2
However, that is not correct for GR we need the time-dilation factor g00^-1/2
g(r) = (c^2/rs)(1 - rs/r)^-1/2   ----> infinity at the black hole horizon for static LNIFs hovering outside it.
we see c^2/rs as rs/r ---> 0
The temperature of the Hawking thermal radiation that the static LNIF detects T = hc/rskB = hc^3/2GMkB
that Unruh cites is what we see far from the black hole where the static LNIF merge to LIFs as rs/r ---> 0
Similarly for the observer-dependent cosmic horizon
g(r) = c^2/^1/2(1 - / ^2)^-1/2
we are at r = 0, so we see T = hc/^1/2/kB
but a static LNIF distance H << /^-1/2 from the horizon sees
T ~ hc/^1/4H^-1/2kB^-1 
Of course a geodesic LIF falling through the horizon sees T = 0 because its covariant acceleration is zero.
The photon is a null geodesic LIF, but the virtual electron-photon pairs clamped to the relative horizon of that retarded photon emitted from r = 0 are static LNIF with covariant acceleration c^2/^1/4H^-1/2.
On Jan 29, 2011, at 11:09 PM, JACK SARFATTI wrote:
On Jan 29, 2011, at 10:49 PM, nick herbert wrote:
====================================
Dear Abbie--
To whom should I turn for reliable information
concerning horizon radiation?
eager to learn
Nick in Boulder Creek
=====================================
======================================================
Dear Nick in Boulder Creek--
You could start with Bill Unruh's clever, amusing, detailed, intelligent
investigations about what might happen at horizons. ...
Take a look at: "Dumb Holes: analogues for Black Holes" by Bill Unruh
http://rsta.royalsocietypublishing.org/content/366/1877/2905.full.pdf
Happy Valentine's Day, eager to learn
Abbie
========================================================


indian porn sexnxxx.cc xvideos Amateur Porn video porno amatoriali filmeporno.top lupoporno film porno gratuit porno mature xnxx film porno gratuit
bisexuel gay porno gay porno देसी सेक्स एचडी पॉर्न ऊपर ऊपर से चुदाई Големи цици