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Physics : Recent Questions and Answers (Page 631)

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

When an object crosses the future horizon, what do you see?

First, there should be a redshift due to the velocity of the object before it crosses the horizon. And then, does the object's light just shut off? Note: There are...

Asked on 01/22/2021 by Maj

1 answer

Does positive curvature imply a closed universe?

Topologically speaking, our universe is either open (topologically $E^3$) or closed (topologically $S^3$). Then with time we'd have another factor of $E^1$ and a metric connection would...

Asked on 01/22/2021

1 answer

Dual vector of sum of vectors

I am new to QM and have a question regarding bra-ket notation and dual vectors. I have a vector $|Psirangle = |arangle + k|brangle$, where $k$ is some...

Asked on 01/22/2021 by Wheels

1 answer

Finding operator sum decomposition of $T(X)=AX+XA$

Suppose $A$ is a positive definite $dtimes d$ matrix and $T$ is a positive map over such matrices defined as follows $$T(X)=AX+XA$$ I'm wondering if if...

Asked on 01/22/2021

1 answer

Separation of Klein-Gordon-/Dirac-equation (Bohmian-mechanics)

With the function $R{ e }^{ frac { i }{ hbar } S }$ one can separate the Schrödinger equation$$i hbar frac{partial psi}{partial t}=left(-frac{hbar^{2}}{2 m} nabla^{2}+Vright)...

Asked on 01/22/2021 by NicAG

1 answer

Why do the principles of physics get more complex when the frame of reference undergoes acceleration?

Why do the principles of physics get more complex when the frame of reference undergoes acceleration?...

Asked on 01/22/2021

4 answer

Why is astronomy intensity interferometry immune to atmospheric turbulence?

I have read there is renewed interest in intensity interferometry in astronomy. I read that intensity interferometry is immune to atmospheric turbulence, which plagues astronomy and regular (amplitude) interferometry. I...

Asked on 01/22/2021

2 answer

One-dimensional harmonic move - input parameter conversion

I have one-dimensional harmonic move, but velocity is defined as function of distance from the beginning V(x) = (Vmax + Vmin)/2 + (Vmax - Vmin)/2 * cos((2 * PI /...

Asked on 01/22/2021 by Michal Steller

1 answer

Commutators and implications of them not equalling 0

I'm struggling to understand the commutator theory for quantum mechanics. I know there's the proof to do with $[P,Q]=0$ therefore there is a set of simultaneous eigenstates for ...

Asked on 01/22/2021 by physconomic

1 answer

Deriving Maxwell-Boltzmann momentum distribution

I am studying statistical mechanics and I saw the following statement in my notes: $$frac{drho}{rho} = frac{e^{-beta p^2/2m}}{(2pi m k_B T)^{3/2}} 4pi p^2 dp quad ldots (1)$$ where ...

Asked on 01/22/2021

1 answer

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