All Questions
Tagged with terminology definition
361
questions
0
votes
1
answer
37
views
What is the difference between loudness, amplitude and volume?
i'm confused because some websites I've seen they are not the same, while my textbook says they're the same, and I'm trying to find the distinction between amplitude, loudness and volume.
0
votes
0
answers
94
views
What is the difference between material time derivative and total time derivative of a tensor field? [closed]
I consider material coordintes as $(X_1(t),X_2(t),X_3(t),t_0),$ ($t_0$ arbitrary) and space coordinates as
$(x_1(t),x_2(t),x_3(t),t).$
$\textbf{Remark.}$ I am interested just in dim=3.
We consider a ...
0
votes
1
answer
89
views
GR and Riemann Surfaces -- does the complex plane have anything to do with it?
I have only the vaguest understanding of Riemann Surfaces -- my sense is that Einstein used them in General Relativity because of their shape.
But Riemann Surfaces I think are not just deformations of ...
0
votes
1
answer
36
views
How can I call a transformation where only the $z$-axis is modified by a function in each point?
What is called a transformation that maps $z \rightarrow |f(z)|\, z$, while the other axis stays the same? Is it a conformal transformation?
0
votes
0
answers
22
views
What exactly are cohesive and adhesive forces?
Are cohesive and adhesive forces defined only when at least one of the interacting materials is a fluid?
0
votes
0
answers
41
views
Is there a practical distinction between functions of state and functionals in thermodynamics?
In thermodynamics, and more precisely when talking about continuous systems, some sources [1, 2] introduce functionals of state:
$$F[s(x), \dots]:=\int_VdV(x)f(s(x),\dots,x)$$
In order to derive ...
0
votes
0
answers
58
views
What is the name of the transformation from one harmonic oscillator basis to another centered elsewhere?
If I have a harmonic oscillator basis centered at $x=2$, how do I rewrite it in terms of the harmonic oscillator basis centered at $x=0$? To be more specific:
If $|\Psi_n\rangle$ is the $n$th ...
0
votes
1
answer
114
views
Renormalization group equation, the Callan-Symanzik equation, and renormalization group flow
I am learning about the renormalization group and I am getting confused on some terminology.
For the massless $\phi^4$ theory the Callan-Symanzik equation is:
$$\big[ M \frac{\partial}{\partial M} + \...
0
votes
1
answer
43
views
Definition of quenched data set/disoprder in the context of spin glass
I cannot come across a good definition of what "quenched" means in the context of spin glass problems. I see such use as "quenched connectivity", "quenched data set", &...
-1
votes
1
answer
76
views
How is matter defined in physics? [duplicate]
I have heard matter defined as energy within a closed system and that any such closed system will have mass.
Is this correct?
0
votes
2
answers
71
views
Why is this called a `Harmonic Oscillator Chain'?
Consider the following general setup:
Assume have a chain of atoms (of mass $m=1$) in one dimension interacting with their nearest neighbor through a interaction potential $U$, and which are in an ...
6
votes
2
answers
175
views
Why is the angular momentum of photon $\hbar$ if the spin is 1?
I saw in many places that the spin of photon which is a boson is 1. Which we can write as $s=1$.
I also saw that the angular momentum of a particle with spin $s$ is $\sqrt{s(s+1)}\hbar$.
If both is ...
0
votes
0
answers
72
views
What is the difference between wavefunction renormalization and field strength renormalization?
A while ago I asked a question asking what is field strength renormalization (What exactly is field strength renormalization?). I now have a better way of thinking about this, which is that it relates ...
2
votes
3
answers
261
views
Are Lissajous figures SHM(s)?
Are Lissajous figures SHM(s)? I have been studying perpendicular superposition of SHM(s). And i understand that 2 shm having same angular frequency and differed by phase pi/2 when superimposed ...
-2
votes
2
answers
97
views
On the physical meaning of functionals and the interpretation of their output numbers
I am studying about functionals, and while looking for some examples of functionals in physics, I have run into this handout .
Here are two questions of mine.
1- This handout starts as follows (the ...