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Derrick C's Projects

3rd-pt icon 3rd-pt

A code to calculate the third order perturbation theory

ddm-frac-hosts icon ddm-frac-hosts

Extract the fraction distribution of ddm particles as a function of halo mass

ddm-halo-model icon ddm-halo-model

To calculate the halo model of ddm to get the non-linear power spectrum

ddm-vf icon ddm-vf

This code can calculate the empirical velocity function of CDM, WDM and DDM. The observed data comes from Klypin’s paper on the local HI survey.

gadget2-ddm icon gadget2-ddm

The extended Gadget2 with the particle update algorithm of solving the structure formation of decaying dark matter.

gpower icon gpower

Calculate gadget file power spectrum with FFT and OpenMP

hadoop-book-example-6-3 icon hadoop-book-example-6-3

This is corrected version of POM for Hadoop definitive guide 4th edition Chapter 6, where the original POM does not work with mrunit.

halo-shape icon halo-shape

The code combines the AHF outputs and an adaptive algorithm to determine a consistent isodensity regions and fits the triaxial shape of the halos.

halo-shape-theory icon halo-shape-theory

Modeling the halo shape parameters distribution with the Zeldovich approximation. A generalization of including the local type non-Gaussianity is also considered.

interp-2d icon interp-2d

A realization of 2 dimensional interpolation using spline functions.

keras icon keras

Deep Learning library for Python. Convnets, recurrent neural networks, and more. Runs on TensorFlow or Theano.

linear-ps icon linear-ps

A quick tool to calculate the linear power spectrum of a given cosmology.

ltic icon ltic

Local Type non-Gaussianity Initial Condition (LTic) generator. This produces the IC for N-body simulation with possible local type Fnl. Parallelization through OpenMP is utilized.

mass-function icon mass-function

A handy tool to calculate the theoretical mass function of cold dark matter cosmology. Different models of f(v) can be easily extended based on the code.

mini-tab-data icon mini-tab-data

Convertor of the NCDC data to mini tab format as required by the Pig or Hive query

minimal-sigma icon minimal-sigma

Minimize Eq.(4) of Angulo and White (2009) to obtain the best length scaling relation and redshift mapping between two simulations.

neff_alpha icon neff_alpha

To find a relation between the neff and the correction of the RSD window function

rsd-window icon rsd-window

The code computes the density power spectrum and the velocity field power spectrum to obtain the window function of the redshift space distortion. The search grid algorithm is utilized to determine the velocity field on grids. The code implements OpenMP to accelerate the computing.

shell-tools icon shell-tools

Pretty handy shell tools: (1) find files in local dir (2) count the lines of all files of common suffix (3) delete files except certain ones.

snapshot-picture icon snapshot-picture

Density field is computed with the NP method. A slice of the simulation output is used to generate the picture.

zoom-in-mask icon zoom-in-mask

The Lagrange masks of the halos of the final output are computed combining the information of the initial condition.

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