New post in Field-theory

Electric potential inside a shell

October 1st, 2020

Translations and Noether's Theorem

May 18th, 2020

Proof that Energy Momentum Tensor of Scalar Field Theory satisfies Weak Energy Condition

March 10th, 2020

The equipartition theorem in momentum space

February 15th, 2020

First class and second class constraints

December 21st, 2020

Zero dimensional field theory

February 18th, 2021

Active transformation and passive transformation of a scalar field

January 21st, 2020

Regarding the Weyl spinor and its transformation properties

July 24th, 2020

How are quantum fields related to representations of the Lorentz group?

July 31st, 2020

What is the essence of BCFW recursion techniques?

September 22nd, 2020

Can we find the boundary conditions of fields from the stationary action principle?

December 12th, 2021

What is the definition of soliton?

October 1st, 2020

Is internal symmetry the same as gauge symmetry?

March 2nd, 2020

Mathematical interpretation of Poisson Brackets

September 11th, 2020

Why is there no kinetic term in the Hamiltonian of the Ising model?

August 1st, 2022

Is String Theory a Field Theory?

August 7th, 2020

Classical Field Theory - Continuum limit in forming the Lagrangian density and the elasticity modulus

August 1st, 2022

What's the difference between perturbative QCD, non-perturbative QCD, and gauge theory QCD?

August 1st, 2022

About the notion of the self-interaction of a field

September 3rd, 2020

Showing that Coulomb and Lorenz Gauges are indeed valid Gauge Transformations?

September 28th, 2020

What is the Lagrangian from which the Klein-Gordon equation is derived in QFT?

September 15th, 2021

Simple conceptual question conformal field theory

December 15th, 2020

Local versus non-local functionals

June 26th, 2020

Generator of local symmetries

April 6th, 2020

What is the difference between kinetic momentum $p=mv$ and canonical momentum?

January 21st, 2021

Is the Lagrangian density a functional or a function?

January 17th, 2020

Noether currents in QFT

February 11th, 2020

Why can we neglect surface terms in Field Theory?

October 9th, 2020

Functional derivative and variation of action $S$ vs Lagrangian $L$ vs Lagrangian density $\mathcal{L}$ vs Lagrangian 4-form $\mathbf{L}$

August 26th, 2020

Why is a theory Lorentz invariant if the Lagrangian is Lorentz invariant?

April 21st, 2020