Reputation
Next privilege 250 Rep.
View close votes
Badges
4
Newest
 Supporter
Impact
~1k people reached

  • 0 posts edited
  • 0 helpful flags
  • 8 votes cast
Oct
27
comment Big Bang snuffed by a black hole?
So if I understand, black holes are a symmetry breaking gravitational condensation phenomenon, and you need that velocity cooling in order for gravity to start a collapse onto a particular seed location? Still it's confusing to me that the huge (isotropic) energy density should imply everywhere very high spatial curvature through the stress–energy tensor in the early universe and yet there are no event horizons.
Oct
27
comment Black hole no-hair theorems vs. entropy and surface area
You mention red shifting to gamma rays but that is the wrong direction, because the light emitted by the box as seen by an observer at infinity will go to lower frequencies with time.
Oct
27
comment The surface area to volume ratio of a sphere and the Bekenstein bound
I may be throwing in a red herring here, but how is the volume of a black hole actually even defined? Because of the curvature of space-time, the volume contained within for example the surface of the Sun and the Earth is greater than the volume enclosed by a similar surface in Euclidean space. Presumably for a black hole this would be pathologically extreme.
Mar
29
comment What is the voltage difference between the Moon and the Earth?
Thats a good point. However I do think that a current can flow if electrons are released from the surface. This can happen if the field strength is great enough to locally ionize the surface material, after which electrons will be accelerated by the field, even without atoms in the space to be ionized. In a vacuum tube the electrons will flow even without a space charge if enough voltage is provided.
Oct
3
comment Calculating torque in a structure
Thanks I understand, thats great.
Oct
3
comment Calculating torque in a structure
Thanks to the person who edited this to add the diagram from math stack exchange.
Oct
2
comment Calculating torque in a structure
Hmm, I didnt know about that forum, but now that I check it appears that new users to physics stack exchange cant post images.