Quantum Field Theory
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... no spooky action at a distance (Einstein)
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Early Results
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Relativistic Quantum Mechanics
| Klein-Gordon Equation Dirac Equation | |

The Dawn of QFT
| Spinors Spin Feynman Slash Notation Antimatter Klein-Gordon Field Dirac Field Renormalisation Grassman Variable Conformal Field Theory | |

Countdown to the Standard Model
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From a framework to a model
| Yang-Mills Theory Quantum Electrodynamics Quantum Chromodynamics Electroweak Theory Higgs Mechanism Standard Model | |

Semi-Classical Gravity and the Dark Age
| Hawking Radiation Chandrashekhar Limit Inflation Problems with the Standard Model | |

Outlook
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Beyond the Standard Model
| Beyond the Standard Model Quantum Gravity Theory of Everything | |

Related
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Related
| De Donder-Weyl Theory
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**De Donder-Weyl Theory** is a formulation of Quantum Field Theory which claims tthat the De Donder-Weyl Equations are "more" explicitly Lorentz-Invariant than the standard Quantum Field Theory.

However, in reality, all this does is introduce a more funny Hamiltonian using a "polymomenta" instead of the standard momenta, which make the Hamiltonian manifestly Lorentz-Invariant.

## Mathematical FormulationEdit this section

### Starting PointEdit this section

The Hamiltonian in Physics is generally strongly tied to the idea of time, as opposed to space, since it is trivial that the Hamiltonian describes the Time-Evolution. This can be seen in, for example, Noether's Theorem and Schrodinger's Equation.

For similar reasons, in Quantum Field Theory,

$ \mathcal{H} = \pi \partial_0 {\phi} - \mathcal{L} $

We thus see, that this is a rather irritating statement for someone who is comfortable with the world of manifestly Lorentz-Invariant creatures.

Therefore, we may instead define the so - called "Polymomenta", as De-Donder and Weyl called it, so that

$ \mathcal{H} = \pi_{\mu}\partial^{\mu} \phi - \mathcal{L} $

Where $ \pi^\mu $ is the "Polymomenta". This is known as the De Donder-Weyl Equation. ^{[1]}\

### De Donder-Weyl EquationsEdit this section

The result of this is rather trivially the "De Donder-Weyl Equations":

$ \frac{\partial p^{i}_a}{\partial x^{i}} = -\frac{\partial H}{\partial y^{a}} $ $ \frac{\partial y^{a}}{\partial x^{i}} = \frac{\partial H}{\partial p^{i}_a} $

## ReferencesEdit this section

- ↑ Paufler, Cornelius; Romer, Hartmann. (2002). "De Donder–Weyl equations and multisymplectic geometry".
*Reports on Mathematical Physics***49**(2 - 3): 325 - 334. http://wwwthep.physik.uni-mainz.de/~paufler/publications/DWeqMultSympGeom.pdf.