What is the significance of parity in group theory?

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SUMMARY

Parity is a significant property in Quantum Mechanics, particularly in the context of Minkowski space and its symmetries. The discussion clarifies that parity and time reversal are isometries of Minkowski space, not directly tied to group theory. The relevant group for proper and orthochronous Lorentz transformations is SO(3,1), with its universal covering group being SL(2,C). For a deeper understanding, Chapter 2 of Volume 1 of Steven Weinberg's work is recommended for insights into these relationships.

PREREQUISITES
  • Understanding of Quantum Mechanics and Minkowski space
  • Familiarity with group theory concepts, particularly Lie groups
  • Knowledge of Lorentz transformations and their properties
  • Basic comprehension of isometries in physics
NEXT STEPS
  • Study the properties of SO(3,1) and its applications in physics
  • Explore SL(2,C) and its role in relativistic quantum theories
  • Read Chapter 2 of Volume 1 of Steven Weinberg's "The Quantum Theory of Fields"
  • Investigate the implications of parity conservation in quantum systems
USEFUL FOR

Physicists, particularly those specializing in Quantum Mechanics and theoretical physics, as well as students and researchers interested in the interplay between group theory and quantum symmetries.

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Parity vs. group theory?

Parity is a special property in Quantum mechanics.
I don't know whether it relates to group thery?
Is it O(2), U(1), or others?

Thank you!
 
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Parity and time reversal are properties (isometries) of Minkowski space, not of quantum mechanics, but I guess I'm nitpicking now. Everything that's relevant for Minkowski space is of course relevant in relativistic QM too. Those two symmetries are not part of any connected Lie group (such as the ones you mention). The group of proper (no parity), orthochronous (no time reversal), homogeneous (no translations) Lorentz transformations is SO(3,1). It's universal covering group is SL(2,C), so relativistic quantum theories can be realized as representations of SL(2,C) or representations up to a phase of SO(3,1). (Chapter 2 of vol.1 of Weinberg is a good place to read about these things).
 


Sorry, I am not family with group theory.
As far as I know the symmetry of space (f(x)=f(-x)) is relative to parity conservation.

I don't know the relation of the symmetry of space and group theory?
 

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