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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Asymptotically safe Lorentzian gravity.

Elisa Manrique¹, Stefan Rechenberger, Frank Saueressig

¹Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, D-55099 Mainz, Germany. manrique@thep.physik.uni-mainz.de

Physical Review Letters

|July 21, 2011

Summary

This summary is machine-generated.

This study explores quantum gravity using a novel renormalization group (RG) approach. It finds that both Euclidean and Lorentzian quantum gravity share similar characteristics at high energies, supporting the asymptotic safety scenario.

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Area of Science:

Theoretical Physics
Quantum Gravity
Renormalization Group Theory

Background:

The gravitational asymptotic safety program seeks a consistent quantum theory of gravity.
This relies on a nontrivial ultraviolet fixed point in the renormalization group (RG) flow.
Investigating this scenario requires accounting for spacetime's causal structure.

Purpose of the Study:

To investigate the asymptotic safety scenario for quantum gravity.
To employ a novel functional renormalization group equation incorporating spacetime causality.
To connect RG flows in Euclidean and Lorentzian signatures via Wick rotation.

Main Methods:

Utilized a novel functional renormalization group equation.
Incorporated the causal structure of spacetime into the RG flow.
Performed a Wick rotation to connect Euclidean and Lorentzian signatures.

Main Results:

Within the Einstein-Hilbert approximation, both Euclidean and Lorentzian RG flows exhibit ultraviolet fixed points.
These fixed points align with the predictions of asymptotic safety.
The two fixed points display remarkably similar characteristics.

Conclusions:

The findings support the gravitational asymptotic safety program.
Euclidean and Lorentzian quantum gravity appear to belong to the same universality class at high energies.
The novel RG approach provides a unified perspective on quantum gravity signatures.