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Randall-Sundrum model for self-tuning the cosmological constant
1Department of Physics and Center for Theoretical Physics, Seoul National University, Seoul 151-742, Korea. jekim@phyp.snu.ac.kr
Physical Review Letters
|May 1, 2001
Summary
This study presents a method for achieving a vanishing cosmological constant in a 5D Randall-Sundrum model. A specific Lagrangian involving a tensor field ensures vacuum energy is zero on the brane.
Area of Science:
- Theoretical Physics
- Cosmology
- String Theory
Background:
- The cosmological constant problem is a major challenge in physics.
- Randall-Sundrum models offer a framework for extra dimensions.
Purpose of the Study:
- To obtain a vanishing cosmological constant in a 5D Randall-Sundrum model.
- To investigate mechanisms for settling brane-localized vacuum energy to zero.
Main Methods:
- Utilizing a 5D Randall-Sundrum model with a brane at y=0.
- Introducing a three-index antisymmetric tensor field A(MNP) with a specific Lagrangian.
- Considering matter fields localized on the brane.
Main Results:
- A vanishing cosmological constant is achieved in the four-dimensional spacetime.
- The proposed Lagrangian and tensor field effectively cancel vacuum energy on the brane.
- A negative bulk cosmological constant is required for the self-tuning mechanism.
Conclusions:
- The study demonstrates a viable mechanism for a vanishing cosmological constant within a Randall-Sundrum framework.
- The inclusion of a specific tensor field and a negative bulk cosmological constant are key to the solution.