2,985 reputation
1425
bio website staff.science.uu.nl/~hooft101
location Utrecht, Netherlands
age
visits member for 3 years
seen Aug 12 at 7:35

Theoretical physicist, Utrecht University.

University Professor. Elementary particle physics, quantum gravity, black holes, quantum mechanics.

Won some prizes (such as the nobel prize 1999), but please don't hold that against me.


Aug
12
comment Does any particle ever reach any singularity inside the black hole?
... what is needed is a fresh look at scale transformation symmetry and conformal symmetry. A way out could be that such symmetry transformations transform the singular situation with an eternally shrinking observer into a regular description of physical events. That would remove the contradiction, but the technical details are not understood - at least not by me. Questions we can answer are ones about the mathematical nature of any given space-time, like some solution to Einstein's equations, but as soon as new physical principles are asked for, we have to be very careful about what to say
Aug
12
comment Does any particle ever reach any singularity inside the black hole?
@Nathaniel, As for the formal nature of the question, you have to realise that the outside world sees the ingoing spaceship (or whatever) approach the horizon exponentially, that is, every microsecond or so, his distance from the horizon is reduced by a factor 1/2. Imagine what that is after millions of years when the black hole decays. But apart from that, you are right and the question is important. Today's understanding of physics at the ultrashort distance scale is quite incomplete, no matter what string theorists and AdS/CFT considerations try to tell you. I strongly suspect that ...
Aug
9
awarded  Yearling
Jun
9
awarded  Nice Answer
Mar
11
awarded  Nice Answer
Jan
19
awarded  Necromancer
Jan
19
revised Deterministic quantum mechanics
added 14 characters in body
Jan
19
answered Deterministic quantum mechanics
Jan
19
revised Deterministic quantum mechanics
edited body
Jan
19
answered Deterministic quantum mechanics
Sep
24
awarded  Autobiographer
Aug
9
awarded  Yearling
Dec
16
awarded  Nice Answer
Dec
16
awarded  Necromancer
Oct
21
awarded  Nice Answer
Oct
14
awarded  Nice Answer
Sep
23
awarded  Nice Answer
Sep
1
awarded  Enthusiast
Aug
9
awarded  Yearling
Jul
24
awarded  Necromancer