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visits member for 3 years, 2 months
seen Jun 28 '13 at 6:11

Feb
17
awarded  Yearling
Jan
31
answered Is the quantization of gravity necessary for a quantum theory of gravity?
Oct
25
answered Reading list in topological QFT
Oct
19
awarded  Supporter
Oct
11
comment What is the physical size of a black hole?
In-fall object crosses horizon in in its own frame and hit the singularity in finite proper time in BH.
Oct
11
comment What is the physical size of a black hole?
BH is usually defined to be a region of spacetime where nothing can come out of. In that sense, an event horizon (for stationary BH) is the boundary of a BH.
May
4
awarded  Yearling
May
4
awarded  Student
May
4
awarded  Nice Question
Mar
19
comment Equivalence of definitions of ADM Mass
Maybe discussion on p469 of Wald can help? especially E.2.46 and 2.47.
Feb
3
answered Introduction to neutron star physics
Jan
7
comment Analog Hawking radiation
@Tim. I don't think John's post on liquid light is related to Unruh's dumb hole.
Jan
4
comment Is there a single metric for a given system?
@HDE. " I don't think there is a sign to tell you "this is the end of the earth surface". Of course not, but this statement is nothing to do with metric. It is a topological statement saying earth surface is compact.
Jan
4
comment Is there a single metric for a given system?
@HDE. 1. " "surface of Earth" is three dimensional space, the "usual" metric include height" No. "Surface of Earth" by definition is a two dimensional space with topology S^2. It is an ideal space. We, as an intrinsically three dimensional species, of course always fell third dimension "height", but Surface + height is already a three dimensional space with topology S^2 \times [a,b].
Jan
4
comment Is there a single metric for a given system?
@Jerry. The original question uses Euclidean metric, so I used it.
Dec
31
answered Reducing General Relativity to Special Relativity in limiting case
Dec
27
answered General Relativity research and QFT in curved spacetime
Nov
3
comment Twistors in Curved Spacetime
I am not familiar with the last one, but own first three. For twistors in curved spacetime, most extensive and up to dated discussion is in Ward and Wells among them.
Nov
3
answered Twistors in Curved Spacetime
Oct
18
asked What is a simple intuitive way to see the relation between imaginary time (periodic) and temperature relation?