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Emergence of a 4D world from causal quantum gravity
J Ambjørn1, J Jurkiewicz, R Loll
1The Niels Bohr Institute, Copenhagen University, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark. ambjorn@nbi.dk
Physical Review Letters
|November 5, 2004
Summary
Causal Dynamical Triangulations in four dimensions offer a quantum gravity definition. Evidence suggests a macroscopic four-dimensional world dynamically emerges from this nonperturbative quantum gravity theory.
Area of Science:
- Quantum Gravity
- Nonperturbative Quantum Gravity
- Cosmological Constant
Background:
- Background-independent definition of quantum gravity.
- Sum over geometries in nonperturbative quantum gravity.
- Positive cosmological constant.
Purpose of the Study:
- Investigate the emergence of spacetime in quantum gravity.
- Provide evidence for a dynamically generated macroscopic world.
Main Methods:
- Causal Dynamical Triangulations (CDT) in four dimensions.
- Nonperturbative quantum gravity framework.
Main Results:
- A background-independent definition of the sum over geometries.
- Evidence for the dynamic emergence of a macroscopic four-dimensional world.
Conclusions:
- Causal Dynamical Triangulations provide a viable framework for quantum gravity.
- Macroscopic spacetime can dynamically emerge from fundamental quantum gravity principles.