596 reputation
519
bio website leosondra.cz
location Rančířov near Jihlava, Czech Republic
age
visits member for 2 years, 10 months
seen 10 hours ago

Dec
13
awarded  Popular Question
Oct
30
awarded  Popular Question
Aug
4
awarded  Nice Question
Jul
2
awarded  Curious
Apr
21
awarded  Nice Question
Feb
22
awarded  Yearling
Oct
11
comment Black hole complementarity - absorption of Hawking radiation
@Trimok The gas is outside the black hole, and doesn't contribute to its mass no more than the observer A does.
Oct
7
revised Black hole complementarity - absorption of Hawking radiation
Rephrased for clarity and to catch attention.
Oct
4
awarded  Necromancer
Sep
30
comment Can masses move in 2+1 gravity?
@user23660 Why is only the linear evolution possible?
Sep
26
comment Can masses move in 2+1 gravity?
@user23660 In a sense, minimal polyhedron have 3 vertices - imagine tetrahedron flatened to zero volume - the fourth vertex have angular deficit 0, in other words you can remove it.
Sep
23
revised Can masses move in 2+1 gravity?
added 383 characters in body
Sep
23
revised Can masses move in 2+1 gravity?
added 193 characters in body
Sep
22
revised Can masses move in 2+1 gravity?
added 524 characters in body
Sep
22
comment Can masses move in 2+1 gravity?
I should perhaps clarify that I am not interested in accelerated motion due to presence of the other point masses but in possibility of any motion.
Sep
22
revised Can masses move in 2+1 gravity?
added 926 characters in body
Sep
22
comment Can masses move in 2+1 gravity?
@user23660 I guess I do :-)
Sep
22
comment Can masses move in 2+1 gravity?
@user23660 Because in such a case there is only upper limit of the total angular deficit and hence mass (in open Flatland): 360 degrees (otherwise you cannot unfold the Flatland without overlaping). Then I understand that the two particles can move freely.
Sep
22
comment Can masses move in 2+1 gravity?
I don't quite understand the answer, I'm afraid, but it seems to me that your reasoning is not restricted to the closed Flatland (where total sum of angular deficits equals 720 degrees). Does it mean that Gott time machine using two cosmic strings is impossible simply because the string (which are analog to the point mass or vertices here) can't move relative to each other?
Sep
22
revised Can masses move in 2+1 gravity?
added 11 characters in body