# Questions tagged [terminology]

Use this for questions relating to the proper use of physics terminology or nomenclature.

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### What does “channel” mean in the context of QCD?

I am familiar with the common use for "channel" in terms of particle physics (like Mandelstam variables). What confuses me is how it's used in the following paper on QCD: C. A. Dominguez, &...
376 views

### What is the difference between “field equations” and “equations of motion”?

I come across the terms "equations of motion" and "field equations" all the time, but what is the difference? For example, general relativity is described in terms of the Einstein ...
45 views

### Why can the word “fusion” mean either “combining” or “breaking/melting” in different contexts? [migrated]

The word "fusion" is at times confusing because in a way it has two opposite meanings: Combining things together, for example "nuclear fusion". Melting/breaking things, for ...
13 views

### “Directionally” translational variance of a function(al)?

Let $f:\mathbb R^3\to\mathbb R$. We define that $f$ is transnational variance if: For any $a\in\mathbb R^3$, $f(x)=f(y) \Leftrightarrow f(x+a)=f(y+a)$. However, if $a$ is limited to be some specific ...
62 views

### What does “continuous spacetime” mean?

I often encounter discussions, such as seen here, about whether spacetime is discrete or continuous. However, I am only familiar with continuity as being a property of functions. I saw this question ...
22 views

### How to convert GeV to AGeV? [duplicate]

The beam energy is sometimes in AGeV in collider papers. I'm stuck on how to convert AGeV to GeV.