Recent content by shahbaznihal

Hi, I leave here the reply by Eric Linder from CosmoCoffee which had been useful for me, You might find useful the notes at https://supernova.lbl.gov/~evlinder/scires.html, specifically https://supernova.lbl.gov/~evlinder/InfoMatrixNotes.pdf. I also leave this link to the MontePython paper...

Hi, I have been studying the Fisher matrix to apply in a project. I understand how to compute a fisher matrix when you have a simple model for example which is linear in the model parameters (in that case the derivatives of the model with respect to the parameters are independent of the...

I am trying to follow a calculation from the book of William C. Saslaw, The Distribution of the Galaxies: Gravitational Clustering in Cosmology. The calculation is shown on the pages following page 122 in chapter 14 where the author talks about the Correlation function. I am able to reproduce...

Correct. But as a while (the central and the other orders) are located on the same plane as the point source? Assume that you have a point source (the laser), would the entire diffraction pattern be located on the same plane as the point source? Thanks for taking time to reply.

I am only targetting to capture the first and central spot. I think it should be on the sample plane as the point source.

Hi, Thanks for your reply. Apologies for the confusion. What I really want to know is how to calculate the location of the entire diffraction pattern on the screen to place the linear CCD array. I hope this clarifies the confusion.

I am trying to make a spectrometer. At the moment, I have an optical setup consisting of a laser, diffraction grating and a screen/detector in a straight line. I am trying to understand how to estimate the location of the diffraction pattern of the slit on the screen? Is it the same location on...

The FRR function calculates the time delay in the rising pulse of two signals.

Hello, This is my first post in this domain and I am fairly novice in this subject, so please bear with me. I have a GDS-20174A Digital Oscilloscope. I am trying to measure the delay between two BNC cables using a Square Pulse of 2V with an offset of 1 V using the oscilloscope. I am using...

Thanks for your comments. Actually, at the moment, it is all classical. The orbits of WIMPs within the solar system follows classical physics principles, or assumed to do so for most part. I am confused about the following parts: 1) What is the phase space number density? How do you define...

I am reading a text which talks about the WIMP speed distribution in the galactic halo in the frame of the Sun and Earth. The point where I am stuck it is trying to explain the concept of Gravitational Focusing of WIMPs at the location of the Earth due to the gravitational well of the Sun...

Saha-Boltzmann equation describes the ratio of number densities between any two consecutive ionization states and its product with the number electron density i.e. $$n_e\frac{n_{i+1}}{n_{i}}$$ Here, ##n_e## is the electron number density, ##n_{i+1}## is the number density in ##i+1## ionization...

I have already gone through the math of the process. The question is not about how different formulations do the math. The question is if there is any physical importance of treating them separately or is it just a mathematical curiosity. All I get from papers is that it is just a generalization...

Thanks for your reply. My literature review of the question got me to the same conclusion.

Hi, In the classical GR space time is manifold. Hence the use of the word spacetime fabric. Other ideas where spacetime is treated as discrete points is not what I was talking about. I assumed (incorrectly may be) weirdoguy is talking about some fictional ideas that spacetime as a continuous...