# Quantum **gauge** theory

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## Quantization[edit]

**Gauge** fixing[edit]

In quantum physics, in order to quantize a **gauge** theory, for example the Yang–Mills theory, Chern–Simons theory or the BF model, one method is to perform **gauge** fixing. This is done in the BRST and Batalin-Vilkovisky formulation.

### Wilson loops[edit]

Another method is to factor out the symmetry by dispensing with vector potentials altogether (since they are not physically observable) and by working directly with Wilson loops, Wilson lines contracted with other charged fields at its endpoints and spin networks.

### Lattices[edit]

An alternative approach using lattice approximations is covered in (Wick rotated) lattice **gauge** theory.

### Older approaches[edit]

Older approaches to quantization for Abelian models use the Gupta-Bleuler formalism with a "semi-Hilbert space" with an indefinite sesquilinear form. However, it is much more elegant^{[clarification needed]} to work with the quotient space of vector field configurations by **gauge** transformations.

## Quantum Yang–Mills theory[edit]

To establish the existence of the Yang-Mills theory and a mass gap is one of the seven Millennium Prize Problems of the Clay Mathematics Institute.

A positive estimate from below of the mass gap in the spectrum of quantum Yang-Mills Hamiltonian has been already established.^{[1]}

## References[edit]

**^**Dynin, A. (January**2017**). "Mathematical quantum Yang-Mills theory revisited".*Russian Journal of Mathematical Physics*.**24**(1): 26–43. arXiv:1308.6571. Bibcode:2017RJMP...24...19D. doi:10.1134/S1061920817010022.

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