Recent content by plasmon

' Researchers use "standards" to judge the field, in which they can work efficiently, i.e. work gets completed within time availibility of funds.

Are the standards of studying/teaching methods same across different branches of theoretical physics like particle, astronomy and cosmology? For example we observe a lot of tours, events and conferences in institutes of astronomy and astrophysics, whereas particle and cosmologists are mostly...

This apple video uses parallax(relative motion of foreground vs background) along with relative size of apples to deliver a partial (In the opening only, when we do least expect) depth experience.

This apple video uses parallax(relative motion of foreground vs background) along with relative size to deliver a partial (In the opening, when we do not expect) depth experience.

I understand that the transition K→π conserves parity. While in pure leptonic decay, the quark current transition K→Vacuum does not conserve parity so it must include parity violating operator.

is the amplitude of pure leptonic decay of pseudo scalar meson(say K→ee), while is the amplitude of the semileptonic decay of K→π ee. Kindly explain why does sd replace sγ5d ee in the amplitude?

Nowadays much of the community of astronomy and astrophysics is focused on simulations and data analysis. Thus people, who do not have access to grids and data, must resort to analytical analysis. What are the challenging areas of astronomy and astrophysics that rely on analytical workout rather...

For centuries, we are using beauty to see space but with stereoscopic tools, it is time to use space to display beauty.

Monocular vision gives only the quality of depth and it needs lots of variation in texture, shading and a strong perspective(not available ideally in photo, possible in painting) to construct a 3d scene. In contrast, binocular vision gives a precise estimate of depth. It only needs a minimum of...

Dear i wish to know what is the validity of assumption that the second order derivative of a(t) is neglected. Kindly clarify the issue.

Form factors in QCD are given in following form "f(q^2)=f(0)/(1-q^2/m^2)". This expression has a pole at q=m. How do we plot these form factors vs center of mass energy and deal with the pole.

Thanks, looks good to me.

I am a researcher and wish to learn astrophysics(research in dark matter). I have never studied astrophysics or astronomy. I am in search for a book that can guide me (1)How do astronomers predict masses of stars, galaxies and planets, their positions and relative velocities? (2) Also...

Here, is one of the many links. http://moleng.physics.upatras.gr/personnel/Koukaras/download/FermiGR.pdf

Take a look into the derivation of transition probability in the case of the constant potential. The derivation shows that the time of the measurement is actually the time during which the interaction potential was switched on. It does not include the time after the potential was switched off...