Physics Questions, Problems & Solutions : TransWikia.com ~ Page 56

Well-definedness of ADM mass, energy, linear and angular momentum

In asymptotically flat initial data sets, one can define the ADM mass, energy, linear and angular momenta via spatial limits of integrals over 2-spheres.My questions are: is asymptotical flatness...

Asked on 09/30/2021 by aceituna

0 answer

How can depletion region be formed at the center?

Let's consider an electron at the junction in the n-type region. As it moves into the p-type we say it leaves behind a positive ion and hence in this way...

Asked on 09/29/2021 by Rohith

1 answer

Question about renormalization parameter in Srednicki's book

In Chapter 9 in Quantum Field Theory written by Srednicki. This chapter discusses why $Z_{i}=1+O(g^{2})$ and $Y=O(g)$, given specific values of $m$, $g$, and normalization conditions...

Asked on 09/29/2021

1 answer

Electric potentials and superposition

I had a question regarding the addition of electric potentials. Consider two positively charged particles $q_1$ and $q_2$ at distance $R$ apart. Let the charges have magnitudes $q_1$ and $q_2$....

Asked on 09/29/2021

2 answer

Cosmology: Inflation, rate of expansion over the first few years

The universe expanded insanely fast during inflation.But even after it ended (maybe around 10^-32 seconds) the universe still expanded extremely quickly, far faster than it does today. It...

Asked on 09/29/2021 by Intrafinesse

2 answer

Squared vector field terms $mathbf{E}^2$ and $mathbf{H}^2$?

Consider the simple case of electromagnetic irradiation of a homogeneous isotropic dielectric, neglecting the dispersion of the refractive index. Assuming a transparent medium, the spatial density of forces acting on...

Asked on 09/29/2021

1 answer

Why, the Valence Bundle is non-trivial and the complete Bloch Bundle isn't?

I'm thinking about the bundles defined in Topological Insulators, and I took that sentence, present in many sources, as true: The topology of the Valence Bundle is non-trivial, i.e.,...

Asked on 09/29/2021 by vbarcelo

2 answer

Existences of Majorana spinors in $rm Spin(4)$ and $rm Spin(1,3)$

$DeclareMathOperatorSpin{Spin}DeclareMathOperatorSL{SL}DeclareMathOperatorSU{SU}$ We know that$$Spin(1,3)=SL(2,mathbb C)$$and$$Spin(4)=SU(2) times SU(2).$$It is also said $Spin(1,3)$ is the complexification of $SU(2)$.My...

Asked on 09/29/2021

1 answer

Fluid flow out of a nozzle

When air or any fluid is forced out of a nozzle, why does the flow take a conical shape just outside the opening? And is there any way we can...

Asked on 09/29/2021

1 answer

Proving $ vec{V} cdot (vec{nabla}vec{V}) = (vec{nabla}cdotvec{V})vec{V} $ using index notation

In my fluid mechanics course we encounter a lot of vector calculus problems, one of which I have been struggling with for a while now. We must prove that...

Asked on 09/29/2021 by Brentdb

2 answer

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