Renormalisation group - Which critical points are usefull in a RG flow diagram?

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SUMMARY

The discussion focuses on the significance of fixed points in renormalization group (RG) flow diagrams, particularly in quantum chromodynamics (QCD). It establishes that the choice between the unstable fixed point and the stable fixed point depends on the specific physical question being addressed. For high-energy scattering processes, calculations are performed near the ultraviolet (UV) fixed point, while for low-energy hadron spectrum analysis, the infrared (IR) fixed point is utilized through Monte Carlo simulations in lattice gauge theory.

PREREQUISITES
  • Understanding of renormalization group theory
  • Familiarity with quantum chromodynamics (QCD)
  • Knowledge of fixed points in RG flow diagrams
  • Experience with Monte Carlo simulations in lattice gauge theory
NEXT STEPS
  • Explore the implications of UV fixed points in high-energy physics
  • Study the role of IR fixed points in low-energy hadron physics
  • Learn about Monte Carlo methods in lattice gauge theory
  • Investigate the mathematical framework of RG flow diagrams
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Physicists, particularly those specializing in quantum field theory, theoretical physicists working on particle physics, and researchers involved in computational physics using lattice gauge theory.

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In a RG flow diagram for a physical system where we have two fix points, which one is the most important one and describes the physical theory of the system?
Is it the unstable fix point or the "stable" one where some of the flow lines flows towards?
 
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It depends on what physical question you want to ask.

Take QCD as an example. To describe high-energy scattering processes, we calculate near the UV fixed point. To describe the low-energy hadron spectrum, we calculate (via monte carlo simulations in lattice gauge theory) near the IR fixed point.
 

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