Download - Fuzzy Euclidean wormholes in de Sitter space
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Dong-han Yeom
Fuzzy Euclidean wormholes in
de Sitter space
Leung Center for Cosmology and Particle Astrophysics, National Taiwan University
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Quantum cosmology
We want to understand the initial singularity
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Two approaches
1. The resolved initial singularity induces an effective classical
geometry, e.g., a big-bounce.
2. The resolved initial singularity becomes a wave function and
the initial condition is a superposition of various initial
conditions.
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Question
1. Typical interpretation of LQC corresponds a big bounce model.
2. Typical interpretation of WDW wave function, e.g., Hartle-
Hawking wave function, corresponds a superposition model.
Is there any correspondence between both pictures?
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In case of HH wave function
Usually interpreted by superposition
Hartle and Hertog, 2015
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In case of HH wave function
However, what if there is a conspiracy?
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Euclidean wormhole as a clue
Euclidean wormhole can give a conspiracy between a
contracting phase and a specific expanding phase
Chen, Hu and Yeom, 2016
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Euclidean quantum cosmology
The Hartle-Hawking wave function
minisuperspace:
eqns of motion:
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Classicality
Due to the analyticity, all functions can be complexified.
However, after a sufficient Lorentzian time, every
functions should be realized: classicality.
Within this classicality, we are allowed to use complex-
valued functions.
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Euclidean wormhole
Initial conditions (2 x 2 x 2 conditions)
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Euclidean wormhole
An example of the wormhole solution
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Euclidean wormhole
An example of the wormhole solution
poles
classicalizeddirections
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Euclidean wormhole
Along a certain Euclidean and Lorentzian contour
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Interpretations
Duality between βtwo time arrowsβ and βone time arrowβ
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Probability
Sometimes, more probable than the Hawking-Moss instantons
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Bridge between two interpretations
If we interpret this as two arrows, then it corresponds the
superposition picture.
If we interpret this as one arrow, then it corresponds the quantum
big bounce.
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Question 1
Can this duality between the quantum big bounce and the
superposition picture be applied for LQC?
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Question 2
Can this big bounce or conspiracy between the contracting and
the bouncing phase be applied for black hole cases?
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Euclidean path-integral
π π = πβπππ«ππ«ππππΊ path integral as a propagator
|πβ© =
π
ππ|ππβ©
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Euclidean path-integral
π π = πβπππ«ππ«ππβπΊπ¬ Euclidean analytic continuation
|πβ© =
π
ππ|ππβ©
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Euclidean path-integral
π π = πβπππ«ππ«ππβπΊπ¬
β πβππ πβπΊπ¬π¨π§βπ¬π‘ππ₯π₯
steepest-descent approximation
need to find/sum instantons
|πβ© =
π
ππ|ππβ©
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Understanding black hole evolution
|πβ©
π π = πβπππ«ππ«ππβπΊπ¬
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Understanding black hole evolution
|πβ©
|ππβ©π π = πβπππ«ππ«ππ
βπΊπ¬
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Understanding black hole evolution
|πβ©
|ππβ©β¦
|πβ© =
π
ππ|ππβ©
π π = πβπππ«ππ«ππβπΊπ¬
Hartle and Hertog, 2015
|ππβ©
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Understanding black hole evolution
|πβ©
|ππβ©β¦
|ππβ©π π = πβπππ«ππ«ππ
βπΊπ¬
|πβ© =
π
ππ|ππβ©
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Understanding black hole evolution
π π β πβππ πβπΊπ¬π¨π§βπ¬π‘ππ₯π₯
|πβ©
|ππβ©β¦
|ππβ©
Euclidean
Lorentzian
Lorentzian
|πβ© =
π
ππ|ππβ©
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Understanding black hole evolution
|πβ© =
π
ππ|ππβ©
π π β πβππ πβπΊπ¬π¨π§βπ¬π‘ππ₯π₯ |ππβ©
β¦|ππβ©
Euclidean
Lorentzian
Lorentzian
If there is a trivial geometry,
then every correlations will be recovered by
the geometry.
Information exists in the wave function.
|πβ©
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Understanding black hole evolution
π π β πβππ πβπΊπ¬π¨π§βπ¬π‘ππ₯π₯
|πβ©
|ππβ©If one follows only one dominant history,
then information cannot be recovered,
though GR and local QFT can be satisfied.
βEffective loss of informationβ
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Asymptotic picture of LQG?
|πβ©
|ππβ©β¦
|πβ© =
π
ππ|ππβ©
|ππβ©
Christodoulou, Rovelli, Speziale and Vilensky, 2016
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Interior picture of instantons
Christodoulou, Rovelli, Speziale and Vilensky, 2016
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Interior picture of instantons
In the Euclidean picture, such an instanton is not well-behaved, and hence it is not easy to give a proper tunneling rate.
However, what if there is a conspiracy? Then it can explain the internal bounce picture!
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Question 3
Non-unitarity of the entire universe, if there are two arrows of time.
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Conclusion
1. There are various kind of Euclidean wormhole solutions that
may be more important than the Hawking-Moss instantons.
2. Euclidean wormholes can be interpreted both ways, either
quantum big bounce (one arrow) or superposition (two
arrows).
3. If this βdualityβ of time arrows are very fundamental, then it will
have very profound implications.