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Physics : Recent Questions and Answers (Page 257)

Find answers to your questions about Physics or help others by answering their Physics questions.

Shift Vector in Warp Equation

In the Alcubierre metric, why is there a beta with subscript multiplied by a beta with superscript? I know beta with subscript is the shift vector, but...

Asked on 06/16/2021 by user345249

3 answer

Shape of exclusion plots of WIMP

What is the reason why the exclusion plots of WIMP experiments have that "U" like shape? And what sets the minimum of the curve?...

Asked on 06/16/2021

1 answer

DOS for anisotropic 2D electron gas dispersion

If we start with the simple 2D isotropic-parabolic dispersion, begin{align}Eleft(textbf{p}right) & approxtilde{varepsilon}_{0}+alpha p_{y}^{2}+alpha p_{x}^{2},label{1}end{align}where $alpha>0$, the DOS can be obtained throughbegin{align}{cal...

Asked on 06/16/2021

0 answer

How to know when a body completes an orbit?

I'm simulating a solar system, and I would like to know when a body, has completed an orbit around another. Is there any specific formula for it? ...

Asked on 06/16/2021

2 answer

Can a black hole be considered as a gray body?

The emissivity of a gray body is constant but is considered to be less than 1. Since the black hole is considered near perfect black body but not a perfect...

Asked on 06/16/2021 by Mohak Saxena

1 answer

Can 2-qubit systems be represented in the Bloch sphere representation?

I am studying a system with 2 qubits, so I need, for a given state, a Bloch representation for each qubit. I am having difficulties because I get results that...

Asked on 06/16/2021

1 answer

Upconversion Particles in Biological Tissues

So I was learning about upconversion particles in biological tissues and understand mainly how they work. UV-Vis light are scattered and absorbed by tissues, so we instead send near-infrared light...

Asked on 06/16/2021

1 answer

Existence of the S-matrix in AQFT

I am reading the book "An introduction to Symmetry and Supersymmetry in Quantum field theory" by Lopuszanski, and I have some problems understanding his argumentation about the existence of the...

Asked on 06/16/2021

1 answer

How do magnetic fields due to random motions of charges cancel out in a current-carrying wire?

In my physics textbook, it states thatmagnetic fields due to random motions of charges cancel out at every pointI know there's a drift velocity due to force imposed by the...

Asked on 06/16/2021

1 answer

Understanding the Double Slit Experiment without Path Integrals

Despite being presented as one of the fundamental results of Quantum Mechanics in practically every textbook, I realized this morning that I don't understand deeply how Quantum Mechanics predicts the...

Asked on 06/16/2021

1 answer

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