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Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Related Experiment Video

Updated: Mar 6, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Chiral fermions in asymptotically safe quantum gravity.

J Meibohm¹, J M Pawlowski²

¹Department of Physics, Gothenburg University, 41296 Göteborg, Sweden ; Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany.

The European Physical Journal. C, Particles and Fields

|March 11, 2017

Summary

This study investigates quantum gravity and fermion interactions. It finds that gravity does not cause chiral symmetry breaking at the Planck scale for many models, suggesting stable phase diagrams.

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Area of Science:

Quantum Gravity
Quantum Field Theory
High-Energy Physics

Background:

The asymptotic safety scenario proposes strongly coupled quantum gravity at high energies.
Quantum gravity may induce significant fermion self-interactions at the Planck scale.
These interactions could potentially lead to chiral symmetry breaking and large fermion masses.

Purpose of the Study:

To investigate the consistency of dynamical fermionic matter with asymptotic safety.
To determine if gravity-induced chiral symmetry breaking occurs at the Planck scale.
To assess the impact of gravitational interactions on the phase diagram of Nambu–Jona-Lasinio (NJL)-type models.

Main Methods:

Utilizing the functional renormalization group (FRG) approach.
Analyzing general classes of NJL-type models.
Building upon previous theoretical works on quantum gravity and fermion dynamics.

Main Results:

Gravity-induced chiral symmetry breaking at the Planck scale is avoided for a broad range of NJL-type models.
This outcome appears robust and independent of the number of fermion fields.
The phase diagram of these models demonstrates topological stability against gravitational effects.

Conclusions:

The asymptotic safety scenario is consistent with dynamical fermionic matter.
The number of fermion fields does not influence the avoidance of Planck-scale chiral symmetry breaking.
Gravitational interactions preserve the topological stability of the phase diagram in these models.