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Physics

Questions tagged [conventions]

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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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Question 1: is it always possible to write the metric in that form? Is it sufficient the local conformally-flat form to obtain the volume?Question 2: Is the volume form in (4.1) well-defined? Going ...
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Could somebody please explain why the convention for the Bloch sphere of a qubit has the $|0>$ state pointing up and the $|1>$ pointing down? I understand that the Bloch sphere representation ...
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This is a rewrite of the original question and calculation, which should be now correct and focusses on the core issues of possible confusion:I was confronted with some confusion regarding the ...
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When do we consider that grounding the conductor makes the potential zero?I was recently seeing why is the outer charge of the system of grounded conducting plate becomes zero, and the reason given ...
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I am a high school student and as I've seen so far when referring to plots of two quantities A vs B, it is usually that the quantity A is on the $y$-axis and the quantity B is on the $x$-axis. Take ...
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There have been a lot of questions (and I want to highlight a wonderful answer) on the topic of potential energy and its sign, in both the gravitational case and the electrostatic case, about the ...
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I got into a fight on the zsh forum over the fact that zsh uses '5.' to indicate the integer 5 but stored as a floating point number. I protested that '5.0' would be better since the trailing dot is ...
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For the scalar field $\phi(\vec{x}=0,t=0)$, we can use translation operator $U=e^{iP\cdot x}=e^{i(Ht-\vec{P}\cdot\vec{x})}$ to move it to $\phi(\vec{x},t)$:$$\phi(\vec{x},t)=e^{iP\cdot x}\phi(0,0)e^{...
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I have some questions about Wick rotations of the Dirac Lagrangian in different signatures. I have seen similar questions, but none of them explain things in the way I need. In fact, I was trying to ...
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Essential Physics 4/e by Richard Wolfson states this:In addition and subtraction, the answer should have the same number of digits to the right of the decimal point as the term in the sum or ...
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I am a bit confused about the whole infinity concept in this context.If "GPE is the energy required to move an object with mass $m$ from infinity to a point $r$ in a gravitational field", ...
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I am looking for a mathematical reason why $-W=\Delta{UE}$ because I am not satisfied with the reason that "so that work done against a force field increases potential energy, while work done by ...
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This part from Electromagnetic - Field Theory Fundamentals (Guru) has always confused me:This part makes sense, it's just the work done by the field:$dW_e = {\bf \vec F} \cdot \vec {dl} = q {\bf \...
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In $d=4$ we can write a theory of $N$ free weyl fermions$$\mathcal{L} = i \bar\psi_{a}(x) \bar\sigma^{\mu} \partial_\mu\,\psi^{a}(x)$$with$$(\sigma^\mu)_{\alpha\dot\alpha} = (\mathbf{1},\sigma^i)...
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I'm unable to find a precise definition of the wavelength or frequency delimiting the radio waves and the microwaves. Some sources are saying that the frequency $f = 1\mathrm{GHz} = 10^9 \, \mathrm{...

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