Archive for non-Gaussianity

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , on December 10, 2021 by telescoper

Time to announce yet another publication in the Open Journal of Astrophysics. This one was published yesterday, actually, but I didn’t get time to post about it until just now. It is the 16th paper in Volume 4 (2021) and the 47th in all.

The latest publication is entitled MCMC generation of cosmological fields far beyond Gaussianity and is written by Joey Braspenning and Elena Sellentin, both of Leiden University.

Here is a screen grab of the overlay which includes the abstract:

 

You can click on the image to make it larger should you wish to do so. You can find the arXiv version of the paper here. This is another one for the Cosmology and Nongalactic Astrophysics folder.

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A Small Problemette related to Cosmological non-Gaussianity

Posted in Cute Problems, The Universe and Stuff with tags , , , on April 8, 2013 by telescoper

Writing yesterday’s post I remembered doing a calculation a while ago which I filed away and never used again. Now that it has come back to my mind I thought I’d try it out on my readers (Sid and Doris Bonkers). I think the answer might be quite well known, as it is in a closed form, but it might be worth a shot if you’re bored.

The variable x has a normal distribution with zero mean and variance \sigma^{2}. Consider the variable

y = x + \alpha \left( x^2 - \sigma^2 \right),

where \alpha is a constant. What is the probability density of y?

Answers on a postcard through the comments box please..

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