https://github.com/esheldon/cosmology

Some code for calculating cosmological distances
https://github.com/esheldon/cosmology

Last synced: 11 days ago
JSON representation

Some code for calculating cosmological distances

• Host: GitHub
• URL: https://github.com/esheldon/cosmology
• Owner: esheldon
• Created: 2011-03-30T14:10:29.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2016-08-08T14:23:16.000Z (over 8 years ago)
• Last Synced: 2024-10-19T20:49:52.795Z (19 days ago)
• Language: Python
• Homepage:
• Size: 38.1 KB
• Stars: 14
• Watchers: 3
• Forks: 3
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
A python package to calculate cosmological distances in a FRW metric.

Description

-----------

A package to calculate cosmological distances.  The workhorse is a class Cosmo

that wraps and the underlying C code.  The geometry can be non-flat.

In order to take advantage of the speed of the underlying C code, you should,

if at all possible, send numpy arrays to the methods rather than repeatedly

call the python methods.

Installation

------------

```bash

    python setup.py install --prefix=/some/path

```

Examples

--------

```python

import cosmology

c=cosmology.Cosmo()

# comoving distance to z=0.5

c.Dc(0.0, 0.5) 

# angular diameter distance between z=0.5 and z=0.9

c.Da(0.5, 0.9)

# luminosity distance between z=0.2 and a sequence of redshifts

c.Dl(0.2, [0.3, 0.4, 0.5])

# new cosmology

c=cosmology.Cosmo(H0=70.0, omega_m=0.25)

# inverse critical density for lensing, lens at 0.2 and

# source at 0.3

c.sigmacritinv(0.2, 0.3)

```

Tests

----------

```python

import cosmology

cosmology.test()

```

TODO

----

 - Add equation of state

 - Add *evolving* equation of state.