Physics Questions, Problems & Solutions : TransWikia.com ~ Page 690

Positivity of correlation functions in the ferromagnetic Ising model

Is it true that all correlation functions of any even number of spins in the ferromagnetic Ising model with nearest neighbors interaction are nonnegative in any spatial dimension? In the...

Asked on 01/01/2021 by Gec

1 answer

Compressible flow - subsonic and supersonic

Imagine a stream of isentropic gas flowing through a nozzle-diffuser. The gas that flows through the throat is subsonic. In this condition, the Mach number of the stream as it...

Asked on 01/01/2021 by Dick Johnson

1 answer

A viscoelastic material with nonconvex memory

I'm new here, so I hope a question like this is allowed. I'm currently researching in the field of partial differential equations with memory. A PDE with memory is usually...

Asked on 01/01/2021 by Lorenzo Liverani

0 answer

Atmospheric orbital velocity profile

In a general scheme of a planet rotating with angular speed $omega_p$, ignoring the formation of convection cells, and asuming that surface layer rotates at $omega_p$ as well,Is...

Asked on 01/01/2021 by Dennis Fr

0 answer

Sail propulsion (or wing lift) by wind deflection (without Bernoulli principle)?

In this clip we can see a model of a car-boat with a sail. (Explicit links. Whole version: https://www.youtube.com/watch?v=zp1KzGQdouI. Parts: https://www.youtube.com/watch?v=jhem8Z9ujPE,...

Asked on 01/01/2021 by cibercitizen1

2 answer

Single Sentence definition of Lorentz Transform

Dear fellow physics lovers, After having spent some significant time to understand the Lorentz Transformations the following is the most simple and complete single sentence definition of it that I...

Asked on 01/01/2021 by Arup Hore

3 answer

Deforming a nematic line defect to a uniform configuration

In Nakahara section 4.9, "Defects in nematic liquid crystals", it is discussed that the order parameter for a nematic should be the real projective plane $mathbb{R}P^2$, which has fundamental...

Asked on 01/01/2021

0 answer

In the QFT Lagrangian, what does the adjoint of $psi$ represent, physically?

In the EM Lagrangian, the QCD Lagrangian, and the charged and neutral weak current Lagrangian, there is always a $psi$ term and its adjoint $bar{psi}$. The $psi$...

Asked on 01/01/2021 by ZenFox42

2 answer

Refraction: Swimming goggles, short-sightedness, and underwater vision

I have thought of this question due to personal experience. I am short-sighted, and over the last three years my short-sightedness has worsened. Taking a lifeguard certificate again now that...

Asked on 01/01/2021 by Marie. P.

3 answer

Bragg-Williams theory of phase transition

Hi I am currently studying Bragg wiliam theory and I dont understand how they derive the equations f(T,m). Actually i...

Asked on 01/01/2021 by kia1996

1 answer

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