# Questions tagged [conventions]

A convention is a set of agreed, stipulated, or generally accepted norms. It typically helps common efficiency or understanding but is not required, as opposed to a strict standard or protocol.

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### Why didn't we change the conventional direction of current after discovering electrons? [closed]

The direction of current is taken to be opposite to that of the flow of electrons, due to the established convention that current is in the direction of the flow of positive charges. My question is ...
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### Is the speed of light exactly 299792458 m/s?

I want to know if there is any uncertainty in the measurement of the speed of light. If yes, please mention the uncertainty.
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### Normalization of $U(1)$ gauge fields

In G. W. Moore, “Introduction to Chern-Simons theories.” 2019 TASI School. [Online]. Available: https://www.physics.rutgers.edu/~gmoore/TASI-ChernSimons-StudentNotes.pdf the $U(1)$ gauge field has a ...
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### Deriving the Yang-Mills equation from the formal definition

We assume the curvature as a $\mathfrak{g}$-valued 2-form on a principal bundle, $F \in \Omega^2(P,\mathfrak{g})$. For the curvature it holds \begin{equation} D_A F=dF+\rho_*(A) \wedge F \end{equation}...
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### What does it mean for $2\pi = 1$ in a “private system of units”?

I saw the following image of an excerpt from Robert Mill's Tutorial on Infinities in QED, floating about the internet: The book is available here, however I don't think I have access to it, unless ...
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### Are there several conventions (source or receiver) for the *Jones vector*? What about the one of particle physics?

There are several conventions for defining the polarisations left and right: from the source and from the receiver. See for example: https://en.wikipedia.org/wiki/Circular_polarization#...