L.D. Edmonds

9 Questions 71 Answers 0 Followers

Questions related from L.D. Edmonds

What is the definition of gauge theory?

I am trying to learn modern physics and frequently encounter the phrase "gauge theory". I look up the definition and find that it is a theory in which a Lagrangian is invariant under a certain...

09 July 2023 7,613 5 View

How do we justify the use of Noether’s theorem applied to local gauge transformations of the Klein-Gordon equation?

The topic considered here is the Klein-Gordon equation governing some scalar field amplitude, with the field amplitude defined by the property of being a solution of this equation. The original...

05 March 2023 6,411 6 View

Does the semi-classical treatment of radiation acting on matter imply a self-force when (I think) it should not?

Start with a purely classical case to define vocabulary. A charged marble (marble instead of a point particle to avoid some singularities) is exposed to an external electromagnetic (E&M)...

19 February 2023 6,658 3 View

Was Nature Unfair to Dogs?

I usually ask more scientific kinds of questions, but this concerns me. The lifespan of humans is not long enough, in my opinion, but dogs get even less. Most dogs don't live past 16 years. The...

12 February 2023 7,912 10 View

Do the field-amplitude operators in quantum field theory have eigenstates that have definite values of field amplitude?

Consider the quantum field theory (QFT) operator (an operator for each space-time point) that the field amplitude becomes when making the transition from classical field quantities to QFT...

04 November 2022 5,205 16 View

Is There an Equation for the Determinant of a Matrix?

The definition, that I have learned, of the determinant of a matrix is a set of instructions on how to calculate its value. This definition can be put in equation form if we keep track of odd...

26 December 2020 4,933 13 View

A General Relativity Question: Where Does the Energy Come From?

I am a novice that needs help with a topic that probably seems elementary to more experienced people. The case considered is a mass M sitting on Earth’s surface. Throughout this discussion,...

19 September 2020 4,979 56 View

Quantum Mechanics Question: How do we show that the operator for total spin of a system of particles commutes with operators for single-particle spin?

Consider a system of two particles. The system was prepared (e.g., by some prior measurement) to have zero total spin. Another measurement is made, either immediately after the preparation or at a...

22 February 2020 5,774 4 View

Can anyone recommend a smarter curve fitting routine?

I have a set of measured data points that empirically defines a function of two variables. I need to fit this data set with a nonlinear analytical function that is given but it contains five...

09 October 2015 5,347 21 View