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Physics : Recent Questions and Answers (Page 575)

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

Relation between bulk Hamiltonian in AdS and stress energy of CFT

Consider the following two situations:One can define a stress energy for AdS which matches with the expectation value for the CFT stress tensor.Consider bulk metric perturbations of...

Asked on 02/11/2021 by Michael Williams

0 answer

Why is the time rate change of unit vector given by the angular velocity vector crossed with the unit vector?

In a wikipedia article about rotating frames is written: $$ frac{d}{dt} hat{u} = Omega times hat{u}$$ What exactly is the intuition behind this equation? I seek a physical explanation...

Asked on 02/11/2021

2 answer

How does the uncertainity principle apply in this situation?

A common (but, as I think, incomplete) description of the uncertainity principle is the following:You cannot determine a particle's momentum and position at high accuracy at the same timeIt could...

Asked on 02/11/2021

2 answer

Should we think about superposition in a fuzzy or in a paraconsistent manner?

Suppose we define a predicate $L$ as "is alive." We then take Schrödinger's cat, $c$, and put it in its box and wait for a time for it...

Asked on 02/11/2021

0 answer

How to explain path of light in different reference frame?

There is a standard diagram for deriving time dilation in special relativity. So say there's a ship in deep space with observer O' in inertial reference frame S' moving to...

Asked on 02/11/2021

1 answer

Is gravity an entropic force after all?

Recently, there was a rapid communication published in Phys.Rev.D (PRD 83, 021502), titled "Gravity is not an entropic force", that claimed that an experiment performed in...

Asked on 02/11/2021 by Vagelford

6 answer

Geometric and mathematical interpretation about a derivative of $H$ and related questions

I would like to check whether my analogy is right and ask some related questions. So, I am studying Thermodynamics right now and there are many calculus techniques are used...

Asked on 02/11/2021

2 answer

Toss of a ball using a double integral

Let's say I want to calculate the height of a thrown ball: Let $x''(t)=-g$ and $x(0)=x(T)=0$ and $x'(0)=v_0$. One could then integrate 2 times and it is...

Asked on 02/10/2021 by manuel459

2 answer

Why is a fourth type of active neutrinos not allowed by the invisible width of the $Z$-boson?

I don't understand the following statement from my notes: "A fourth active neutrino is not allowed by the invisible width of the $Z$-boson to which it would contribute as...

Asked on 02/10/2021

2 answer

Will a satellite orbiting the moon have a tidal locked orbit?

Suppose an artificial satellite is launched to orbit the moon. Ignore 3-body problem issues, just assume it follows a roughly titled elliptical orbit relative to the plane cutting through earth's...

Asked on 02/10/2021 by abnry

2 answer

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