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Physics : Recent Questions and Answers (Page 290)

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

Numerically solving the equation of motion for inflation in cosmology

So I want to solve the equation of inflation involving a scalar field numerically using python libraries such as odient or scipy. The equation is:$$defphi{varphi}phi''(t)+3Hphi'(t)+V'(phi(t))=0$$with given...

Asked on 06/03/2021 by user14491798

0 answer

Conservation of current induced by two-dimensional scale-invariance

I'm writing my bachelor thesis in CFT (without ever having taken any courses in any field theory) and I'm trying to figure out why in two-dimensional scale-invariant theory the conservation...

Asked on 06/02/2021 by Yalom

1 answer

Does the first postulate of special relativity imply constant speed of light?

The two postulates of special relativity areThe laws of physics take the same form in all inertial frames of reference.The speed of light in free space has the same value...

Asked on 06/02/2021

3 answer

Standard Model: Problem with Masses of Elementary Particles?

In his book "Modern Particle Physics", Mark Thomson explains two problems with masses of elementary particles in the SM: (i) If we take the QED Lagrangian $mathcal L =...

Asked on 06/02/2021

1 answer

Parabolic mirrors used in pair to produce much higher intensity light beam ready for transmission?

If a parabolic mirror is used to concentrate sunlight approximately to a focus point why can't an another smaller parabolic mirror be used to reparalelise the beams that are...

Asked on 06/02/2021

1 answer

How can the SUVAT equations be derived from Newton’s laws of motion?

I would argue that the SUVAT equations, which correctly describe all constant-acceleration motion (including hypothetical situations governed by unusual laws of dynamics), cannot possibly be derived from a specific set...

Asked on 06/02/2021 by Brian Drake

3 answer

Interactive physics simulations and animations

What are some free and open-source interactive simulations, illustrations, animations, demonstrations, videos, calculators and other resources for experimental physics and mathematics like the Wolfram demonstration project...

Asked on 06/02/2021 by huzaifa abedeen

2 answer

How do Hamilton's equations deal with non-conservative forces?

I have searched everywhere I know to look but I cannot find out how Hamilton's equations deal with non-conservative forces. In my understanding, Lagrangian mechanics deals with this as follows:...

Asked on 06/02/2021

2 answer

A doubt about the classic problem of measuring the speed of light in only one direction

Why can't two clocks synchronized with signals SLOWER than the speed of light, measure the speed of light in one direction? I know that it is not possible to measure...

Asked on 06/02/2021

1 answer

Is it possible for a metal plate to move when a beam of light rays is incident on it?

When a beam of light rays fall on a metal surface at an angle, shouldn't the electrons get ejected( due to transfer of energy and momentum ) just like in...

Asked on 06/02/2021

0 answer

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