# A Non-BRST Approach to Gauge Field Theories

**Lars Brink
** (Institutionen för teoretisk fysik och mekanik, Elementarpartikelfysik)
**Calimaneste 2004** (2005)

[Konferensbidrag, övrigt]

Gauge field theory is usually used to describe particles with spins higher than 1/2. The gauge invariance represented in terms of the BRST invariance is often crucial for studying the quantum properties of those theories. Yet there is a another very different formulation sometimes called the light-cone gauge approach or the light-front approach used to study quantum properties, where the only symmetries present in the theory are the Poincar\'e symmetry and perhaps some global external symmetries. There are no unphysical degrees of freedom in the fields. The elementary particles are related to the irreducible representations of the Poincar\'e algebra. In this formulation of quantum field theory one can extend these representations to depend also on a coupling constant. The representations then become non-linear and contain the interaction terms which are shown to have strong uniqueness. Extending the algebra to supersymmetry it is shown that two field theories stick out, N=4 Yang-Mills and N=8 Supergravity and their higher dimensional analogues. I also discuss string theory from this starting point.

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**Harvard**

Brink, L. (2005) *A Non-BRST Approach to Gauge Field Theories*.

** BibTeX **

@conference{

Brink2005,

author={Brink, Lars},

title={A Non-BRST Approach to Gauge Field Theories},

booktitle={Calimaneste 2004},

abstract={Gauge field theory is usually used to describe particles with spins higher than 1/2. The gauge invariance represented in terms of the BRST invariance is often crucial for studying the quantum properties of those theories. Yet there is a another very different formulation sometimes called the light-cone gauge approach or the light-front approach used to study quantum properties, where the only symmetries present in the theory are the Poincar\'e symmetry and perhaps some global external symmetries. There are no unphysical degrees of freedom in the fields. The elementary particles are related to the irreducible representations of the Poincar\'e algebra. In this formulation of quantum field theory one can extend these representations to depend also on a coupling constant. The representations then become non-linear and contain the interaction terms which are shown to have strong uniqueness. Extending the algebra to supersymmetry it is shown that two field theories stick out, N=4 Yang-Mills and N=8 Supergravity and their higher dimensional analogues. I also discuss string theory from this starting point.},

year={2005},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 4765

A1 Brink, Lars

T1 A Non-BRST Approach to Gauge Field Theories

YR 2005

T2 Calimaneste 2004

AB Gauge field theory is usually used to describe particles with spins higher than 1/2. The gauge invariance represented in terms of the BRST invariance is often crucial for studying the quantum properties of those theories. Yet there is a another very different formulation sometimes called the light-cone gauge approach or the light-front approach used to study quantum properties, where the only symmetries present in the theory are the Poincar\'e symmetry and perhaps some global external symmetries. There are no unphysical degrees of freedom in the fields. The elementary particles are related to the irreducible representations of the Poincar\'e algebra. In this formulation of quantum field theory one can extend these representations to depend also on a coupling constant. The representations then become non-linear and contain the interaction terms which are shown to have strong uniqueness. Extending the algebra to supersymmetry it is shown that two field theories stick out, N=4 Yang-Mills and N=8 Supergravity and their higher dimensional analogues. I also discuss string theory from this starting point.

LA eng

OL 30

Denna post skapades 2006-08-25.

CPL Pubid: 4765