the common origin of gravity dark energy and matter
TRANSCRIPT
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THE COMMON ORIGIN OF GRAVITYTHE COMMON ORIGIN OF GRAVITYDARK ENERGY AND MATTERDARK ENERGY AND MATTER
Erik VerlindeErik Verlinde
University of AmsterdamUniversity of Amsterdam
CERN Colloquium , 28/04/11
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Matter and Forces
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Current Paradigm
FUNDAMENTAL FORCES: carried by elementary particles
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We may need to reconsiderour current paradigms
theory & observation
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96% of the Energy in our Universeis not understood!
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String Theory
FUNDAMENTAL FORCES: carried by vibrating strings
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D-branes
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EMERGENCE
We use concepts and observe phenomena at a macroscopic scale, which are derived from a microscopic scale where they have no a priori meaning
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Open/closed stringor
gauge theory/gravity duality
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Black Holes
R =2GM
c2
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Black Holes
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Black HoleBlack HoleHorizonHorizon
Consider a particle gradually
lowered into a black hole.
Classically, the energy
associated with the particle gets
redshifted, and vanishes when
the particle is at the horizon.
Bekenstein
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Black HoleBlack HoleHorizonHorizon
Now take a gas of particles
lowered in to a black hole.
What happens to the entropy?
BekensteinHawking
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SBH = kB
Ac 3
4G
Black Hole Entropy
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Hawking Temperature
g =GM
R2T =
1
2p
g
kBc
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Unruh Temperature
T =1
2p
a
kBcin acceleratedframe
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Holographic principle
The information associatedwith a certain part of spacemay be (heuristically ) represented as bits on the surface surrounding it.
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ADS/CFT CORRESPONDENCE
EQUIVALENCE BETWEEN FIELD THEORY ON THE “BOUNDARY”AND GRAVITY IN THE “BULK”
ONE SPACE DIMENSION EMERGES CORRESPONDING TO THE “SCALE” OF THE BOUNDARY THEORY. RADIAL EVOLUTION IS LIKE RENORMALIZATION GROUP FLOW.
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Black Black HoleHole
In In AdSAdSspacespace
Bulk descriptionBulk description
Thermal Thermal Heat BathHeat Bath
TDelocalized state gets Delocalized state gets thermalizedthermalized by heath bathby heath bath
Boundary description:Boundary description:
Particle gets lowered Particle gets lowered in to black holein to black hole
Hot CFTHot CFT
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Entropic force (wikipedia)
An entropic force is a macroscopic force whose
properties are determined not by the
character of an underlying microscopic force,
but by the whole system's statistical
tendency to increase its entropy.
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WarmtebadWarmtebad
PolymeerPolymeer
T
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WarmtebadWarmtebad
PolymeerPolymeer
T
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PolymerPolymer
T
EntropicEntropic
ForceForce
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Gravity as an Emergent Force
At a fundamental scale our notions of space and time and matter cease to exist: they are derived concepts.
In describing Nature in terms of space-time and matter, we ignore many degrees of freedom.
Gravity arises because the amount of phase space(information) available for these degrees of freedomis influenced by the location of matter in space and time.
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m
F
M
R
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A HEURISTIC ARGUMENT
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A HEURISTIC ARGUMENT
m
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A HEURISTIC ARGUMENT
m
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A HEURISTIC ARGUMENT
m
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A HEURISTIC ARGUMENT
m
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A HEURISTIC ARGUMENT
m
T
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A HEURISTIC ARGUMENT
m
T
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A HEURISTIC ARGUMENT
m
T
kBT =a
2pc
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A HEURISTIC ARGUMENT
m
T
kBT =a
2pc
F = ma
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RA HEURISTIC ARGUMENT
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# bits =4pR2
2
RA HEURISTIC ARGUMENT
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
T
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
12 kBT = E / #bits
T
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
12 kBT = E / #bits
E = Mc2
M
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
12 kBT = E / #bits
E = Mc2
M
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
12 kBT = E / #bits
E = Mc2
M
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# bits =4pR2
2
R
2 =G
c 3
A HEURISTIC ARGUMENT
12 kBT = E / #bits
E = Mc2
M
F =GMm
R2
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m
F
M
T
This is heuristic, so far…
It is bit of a “swindle”
but it catches the essence.
It should be seen as a
metaphore. But of what?
• Why does it work?
• What is the meaning of the temperature?
• What is the nature of this information?
• Why is it stored on screens? Can this be derived?
• Why is gravity attractive?
• What about the other forces?
• Are there observable consequences?
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Holographic screens at equipotential(= equal redshift) surfaces
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The phase space can be described by counting the ways in which the energy can be distributed over the cells on the boundary
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Adiabatic principle:
When a fast dynamical system is driven by a slow system the fast reacts back on the slow and creates a reaction force.
When the time scales are widely separated the force is determined by the principle that the phase space volume is preserved.
In quantum mechanics this is a consequence of the Born-Oppenheimer approximation.
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MicroscopicMicroscopicFast VariablesFast Variables
BornBorn--Oppenheimer & Entropic ForceOppenheimer & Entropic Force
H(p,q;x)
xMacroscopicMacroscopic
Slow VariablesSlow Variables
x
E
The system stays in an energy The system stays in an energy eigenstateeigenstateof the fast variablesof the fast variables( adiabatic theorem).( adiabatic theorem).
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Adiabatic Reaction ForceAdiabatic Reaction Force
x
E
Assuming Assuming eigenvalueseigenvaluesdon’t cross, the force don’t cross, the force follows from an follows from an adiabatic argument adiabatic argument
F = -¶E
¶x
æ
è ç
ö
ø ÷
S
= T¶S
¶x
æ
è ç
ö
ø ÷
E
1
kBT=
¶S
¶E
æ
è ç
ö
ø ÷
x
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Degenerate Fermions
GRAVITATIONAL COLLAPSE:
What happens to the phase space occupied by the fermions?What about the fermi statistics?
NEUTRON STAR
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Statistics operation: discrete
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Yparticle 1
Þ a Yparticle 1
+ b Yparticle 2
Statistics operation: why not continuous?
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x1,x2 Þx11 x12
x21 x22
æ
è ç
ö
ø ÷
Positions get ambiguous
xij = Yiˆ x Y
j
Y1ˆ x Y
2¹ 0
Coordinates turn
into matrices
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X =
x11 .. x1N -1 x1N
: :: : :
xN -1,1 .. .. xN -1,N
xN1 .. xN ,N -1 xNN
æ
è
ç ç ç ç
ö
ø
÷ ÷ ÷ ÷
At horizons space and time dissappear.
At horizons the separation oftime scales between the eigenvalues and the “off diagonal modes”breaks down and the coordinatesbecome non commuting matrices.
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X =
x11 x12 .. x1N
x21 x22 :: :
: :: :: xN -1N
xN1 .. xNN -1 xNN
æ
è
ç ç ç ç
ö
ø
÷ ÷ ÷ ÷
GRAVITATIONAL COLLAPSE:
What happens to the phase space occupied by the fermions?
Answer: It goes into the off diagonal phase phase. Not of gravity!
After collapse one can no longer integrate out the off diagonal modes!!
Eigenvalues and off diagonal modes equilibrate and together form “black hole stuff”.
Degenerate Fermions
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Black HoleBlack HoleHorizonHorizon
Thought experiment
T
X =
x11 .. x1N z1
: :: : :
xN1 .. xNN zN
z1
* .. zN
* yI
æ
è
ç ç ç ç
ö
ø
÷ ÷ ÷ ÷
F = T¶S
¶x
Entropic force
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Why do we need to reconsider the origin of gravityand change our current paradigms?
96% of our Universe is not understood!
Our current paradigms ignore a lot of information(phase space). .
Whatwent wrong?
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CosmologicalHorizon
kT =H0
2p
De SitterSpace
H0
2 = c2L
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x11 . . . x1N . xN ,N +n
. . . . . . .
. . . . . . .
. . . . . . .
xN1 . . . xNN . .
. . . . . xN +1,N +1 .
xN +n,1 . . . . . xN +n,N +n
æ
è
ç ç ç ç ç ç ç ç ç
ö
ø
÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷
kT =H0
2p
S =c2H0V
4G
These ideas can be applied to our universe
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x11 . . x1N . . xN ,N +n
. . . . . . .
. . . . . . .
xN1 . . xNN . . .
. . . . xN +1,N +1 . .
. . . . . . .
xN +n,1 . . . . . xN +n,N +n
æ
è
ç ç ç ç ç ç ç ç ç
ö
ø
÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷
Dark energy and matter are made of the same stuff
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x11 . . x1N . . xN ,N +n
. . . . . . .
. . . . . . .
xN1 . . xNN . . .
. . . . xN +1,N +1 . .
. . . . . . .
xN +n,1 . . . . . xN +n,N +n
æ
è
ç ç ç ç ç ç ç ç ç
ö
ø
÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷
At horizons space and time dissappear.
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Dark Energy and Dark Matter
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Clusters
Galaxies
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Flattening of rotation curves
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Flattening of rotation curves
V4 = GMBa0
a0= 1.24 ± 0.14 × 10-10 m/s2
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