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power spectrum from Zel'docivh initial condition  

2012-04-20 22:23:00|  分类: cosmology |  标签: |举报 |字号 订阅

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Here Zel'dovich initial condition means that the IC is genertated using Z approximation, but acutally in my recently work, 2LPTic, a second order approximation is used. 2LPTic is a public initial condition generator code.  During these days work, I understood how IC is generated and what's more important is that I am now firmiliar with the details, if I can't handle these I would not get any result.

Here is what I have done:

I generate the ICs, taking them as an "realization" the large scale structure of the universe, and then I compute the real-space power spectrum both in 1D and 2D, then transform into red-shift space and redo the calculations, and finally I compared the results.

the first pic shows the ratio of P_s(k) to P(k), here P_s(k) is measured by assuming that we don't know the real space is distored, and the ratio is in agreement with Kaiser's theory.

the second pic plots the two 1D power spectra together.


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