gerard ’t hooft berlin november 1, 2007 utrecht university of the
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Gerard ’t HooftBerlin
November 1, 2007
Utrecht University
of the
How do we reconcile these with LOCALITY?
paradox
Black Holes require new axioms for thequantization of gravity
Unitarity,Causality, ...
paradox
Black Hole Quantum Coherence is realized in String/Membrane Theories !
-- at the expense of locality? -- How does Nature process information ?
The physical description of the difficulty ...
horizon
Here, gravitational interactions become
strong !!
brick wall
interaction
horizon
b
By taking back reaction into account, one can obtain a unitary scattering matrix
Gravitational effect from ingoing objects
particlesout
in
2 2
The coordinate shift can be calculated
to be :
which obeys :
4 log
8 p ( )
x G p x
x G x
in in in, p
2out out outexp ( ) ( )i d x P x y x
2
2 2
( ) d ' ( ') ( ')
( ') ( ') 8 1
y x x G x x p x
G x x x x G
out
2 2out outexp d d ' ( ) ( ') ( ')i x x P x G x x p x
Strategy: infinitesimal modification of in-state
out
2 2out outexp d d ' ( ) ( ') ( ')i x x P x G x x p x
in in
2 2out out in
( ')
exp d d ' ( ) ( ') ( ')
P x
i x x P x G x x P x
a string theory amplitude !!nearly
Repeat procedure:
D Dout in
2
( ) ( )
exp d
X x X x
x i X X i X P i X P
The string world-sheet
Black Hole Formation & Evaporation by Closed Strings
Horizon Algebra
N
N
2 2out in
2in in
d d ' ( ) ( ') ( ')
out in
d ( ) ( )
in in
2in in
2in
so that
therefore
( ) ( ')
( ) ( ') ,
( ), ( ') ( ') ,
( ) ' (
i x x P x G x x P x
i x P x U x
def
P x P x e
U x P x e
P x U x i x x
U x d x G x x
out
2out in
2 2out in
2 2out in in out
') ( ')
( ) ' ( ') ( ')
( ), ( ') ( ') ; ( ')
( ) ( ) ; ( ) ( )
P x
U x d x G x x P x
U x U x iG x x G x x
U x P x U x P x
BLACK HOLE WHITE HOLE
A black hole is a quantum superposition ofwhite holes and vice versa !!
The Difference between
N
Pl
0G
M
®
® ¥
very early
very late
in
out
0z t= =
S-matrix Ansatz:Qu. Gr. gives us aboundary conditionhere
ìïïïïíïïïïî
But, our algebra does not generate the area law. Canwe be more precise? Transverse gravity?
Now, let us look at the contributionsfrom the Standard Model Scale
It all happensat the originof RindlerSpace
S
In Standard Model
units, the -matrix
is generated at the
origin.
out in
2-d surface
The Standard Model Contribution to theHorizon Algebra. I. The U (1) field
in
2in
2right left in
Ingoing charged particles :
Outgoing charged particles undergo thi
( ) ( ) ( ) , 0
( ) ( ) d ' ( ') ( ') , 0
( ) ( ) ,
( ) ( ) d ' ( ') ( ')
J x x x J J
A x x x G x x x A A
A x x
x x x G x x x
2 2
out ind d ' ( ) ( ') ( ')
s gauge rotation :
out outi x x x G x x x
e
2 2out in
2in in
d d ' ( ) ( ') ( ')
d ( ) ( )
in in
2
In wave functions
the operators and obey commutation rules
, so, we
out out
( ) ( ) ,
( ) ( )
( ) ( ') ( ') ,
i x x x G x x x
i x x x
e
x x e
x x
x x i x x
2in out
2out in
in out
2 2in out
have
( ) d ' ( ') ( ')
( ) d ' ( ') ( ')
( ), ( ') ( ')
( ), ( ') ( ')
x x G x x x
x x G x x x
x x iG x x
x x i x x
L scalar 21
2
in out
let ,
then ( ,0,0) ( ,0,0)
this implies
and commutes with everything.
( ) is a fiesp o luri n d
( ) ( )
i i
i
i
i
i i
x x x x
x x
x
D V
The role of the Standard Model’s scalar fields
Scalar field acts as quantum hair
It generates a modification in the vector fieldequations:
L
2
in
2
* *14
2 2 *
Now, the vector field obeys
( ) ( ) d ' ( ') ( ') with
( ) ( ) ( ') ( ')
( ) ( , )
( )
2
i i
A x
A x x x G x x x
x x G x x x xe
F F D D V
( ) *( ')
( ) ( ') *( ") *( '")
i j
i j k
x x
x x x x
are as their(Euclidean)quantum exp.values
The average values of the scalar fields:
Questions:- What is the effect of Standard Model fermions ?- How do we handle non-Abelian vectors ?- What is the effect of the instanton angle ?- What modifications of the algebra are generated by the transverse grav. force ?- Does this allow for a representation of the algebra with discrete states, as suggested by the entropy – area law?
A related question that we can answer:What is the effect of magnetic monopoles ?
in, out in, out
2
1 out in
1 out in
1 out in
out
( ) , ( )
( ) ( )
( ), ( ') (2 ) log '
( ), ( ') (2 ) '
( ), ( ') (2 ) '
( ),
arg
arg
E M
E Mi i in ij j in
E E
E M
M E
M
x x
F x
x x i x x
x x i x x
x x i x x
x 1in( ') (2 ) log 'M x i x x
arg has a Dirac string - ambiguity 2 n
NS
[ , ]
[ , ]
E M
But if we consider exp and exp
then use
(if [ , ] is a c-number)
is unambiguous if
2 Dirac condition !
and must be quantized:
E M
iA iB iB iA A B
A B
ie im
e e e e e
A B
e
e m n
E 2 ( )
M 2 ( )
( ) ( )
( ) ( )
i
i
j
j
x x x
x x x
e
m
2d ( ) ( )
( ) ( )
i x x x
x x
e
A non-Abelian gauge theory may now be treated in its Cartan subalgebra,where the diagonal components of electric and magnetic charges arewell-defined.
Particles and horizons, the hybrid picture
We intend to obtain the complete algebra relating the in-operators to the out-operators from whatever Standard Model Lagrangian.
Once the rules are clear, we should be able once again to add (transversal) gravity. The representation of our algebra should then respect the entropy / area law.
The algebra should generate the details of quantum black hole dynamics.
“The black Hole Horizon as aDynamical System”,Int.J.Mod.Phys. D15 (2006) 1587 earlier version: gr-qc/0504120