Physics Questions, Problems & Solutions : TransWikia.com ~ Page 651

Disentangling exponential of number operator and creation and annihilation operators

Is there a way to disentangle the exponential of the sum of the number, the annihilation and the creation operator? For example, $$e^{alpha N + beta a + gamma...

Asked on 01/15/2021 by oweydd

2 answer

Lorentz group generators and its dimensionality

I am unsure about the generators of the Lorentz group and its dimensionality. I believe any Lorentz transformation can be written as the product of a proper, orthochronous Lorentz transformation...

Asked on 01/15/2021 by Alex Ghorbal

1 answer

Why consider spacetime trajectories that cut a $t=$constant at more than one points in the path integral of a relativistic particle?

Here is a picture from Padmanabhan's book on quantum field theory. Also described in the first part of ...

Asked on 01/15/2021 by mithusengupta123

1 answer

From geodesic motion of photons to Maxwell equations in curved spacetime

In curved spacetime, 1.) a photon is supposed to move along a null-geodesic, i.e., a trajectory $x^{mu} = x^{mu}(lambda)$ satisfying $$frac{d^{2}x^{rho}}{dlambda^2} + Gamma^{rho}{}_{munu}frac{dx^{mu}}{dlambda}frac{dx^{nu}}{dlambda} = 0$$ and $$g_{munu}frac{dx^{mu}}{dlambda}frac{dx^{nu}}{dlambda}...

Asked on 01/15/2021 by John Fredsted

0 answer

Acceleration of two bodies in contact with each other

Let us place two blocks having mass $m_1$ and $m_2$ in contact with each other on a frictionless surface. Let us assume that one of the blocks is...

Asked on 01/15/2021 by user14598090

3 answer

What will be the distance of a point from black hole where we will not experience its relativistic effects?

Could you please tell me what will be the distance from the singularity of a black hole to a point outside of the black hole where we will not feel...

Asked on 01/15/2021 by goosemanchiru

1 answer

What is "average life" in terms of nuclear physics?

I am having a doubt after reading on so many sites. I am not able to understand the clear meaning of average life. Whether it is 36.18 or something else....

Asked on 01/15/2021 by Abha Jaiswal

3 answer

Best way to calculate local density of states of tight binding model

I am currently trying to analyze a system using a tight binding model. I have a quite complicated unit cell with more than nearest neighbor hopping, that is repeating in...

Asked on 01/15/2021 by alexFr

0 answer

They say the universe is expanding. Is that the same as saying that time is contracting?

Apparently the distance between galaxies used to be smaller in the distant past. That means it used to take fewer units of time to get from one galaxy to...

Asked on 01/15/2021 by Roger Wood

2 answer

Why is the direction of cathode rays independent of the position of anode?

The following statement is from the book Concepts of Physics Volume 2, by Dr. H.C. Verma, chapter 41 - "Electric Current through Gases", topic "Cathode Rays", page 343:Cathode rays are...

Asked on 01/15/2021 by Guru Vishnu

2 answer

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