
 Information on this archive. See IIDB.org


Please join us on IIDB (iidb.org)
This is the archived Seculare Cafe forum. It is read only. If you would like to respond or otherwise revive a post or topic, please join us on the active forum: IIDB.

Stephen Hawking
 MattShizzle
 Posts: 18963
 Joined: Sun Aug 22, 2010 6:22 pm
 Location: Bernville, PA
Stephen Hawking
If anyone doesn't know by now, he died 2 nights ago. So here's him singing the Monty Python Galaxy Song.
https://www.youtube.com/watch?v=XfcC6FYyL4U
https://www.youtube.com/watch?v=XfcC6FYyL4U
 Minnemooseus
 Posts: 47
 Joined: Thu May 22, 2014 9:17 am
 Location: Northern Minnesota, USA
On a related note
"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything."  Moose
It seems to me that he owed much of his fame to his disability, and how he nevertheless was as productive and successful as he was. But given what he had to go through, that was a great triumph for him.
He did some important scientific work.
His first big success was on generalrelativity singularity theories. He showed that singularities, regions with infinite curvature, would form under a variety of circumstances, and he did so with techniques that were not restricted to special cases like spherical symmetry.
He then worked out the thermodynamics of black holes. Applying quantum mechanics to them, he showed that they have welldefined temperatures, and that they emit particles  "Hawking radiation". A colleague of his, Jacob Bekenstein, showed that black holes have some thermodynamicslike properties, and SH's work confirmed this analogy.
Essentially,
He also got into popularization, writing books like "A Brief History of Time".
He did some important scientific work.
His first big success was on generalrelativity singularity theories. He showed that singularities, regions with infinite curvature, would form under a variety of circumstances, and he did so with techniques that were not restricted to special cases like spherical symmetry.
He then worked out the thermodynamics of black holes. Applying quantum mechanics to them, he showed that they have welldefined temperatures, and that they emit particles  "Hawking radiation". A colleague of his, Jacob Bekenstein, showed that black holes have some thermodynamicslike properties, and SH's work confirmed this analogy.
Essentially,
 Blackhole temperature ~ its surface gravity at its event horizon
 Blackhole entropy ~ its event horizon's area
He also got into popularization, writing books like "A Brief History of Time".
Temperature = that's essentially the random energy per bit of a system.
Entropy = that's the number of bits of description for going from a full microscopic description from a macroscopic description. Consider throwing a pair of sixsided dice. There are six ways of rolling a seven, but only one way of rolling a two or a twelve. That means that one needs about 2.5 bits of description to get from a seven to which numbers were on each die, and 0 bits for a two or a twelve.
Event horizon = that's the point of no return for a black hole, or more precisely, the surface formed by all such points.
Entropy = that's the number of bits of description for going from a full microscopic description from a macroscopic description. Consider throwing a pair of sixsided dice. There are six ways of rolling a seven, but only one way of rolling a two or a twelve. That means that one needs about 2.5 bits of description to get from a seven to which numbers were on each die, and 0 bits for a two or a twelve.
Event horizon = that's the point of no return for a black hole, or more precisely, the surface formed by all such points.