From fea0272a343ec700505654c6d042538d0db590f9 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Tue, 29 Aug 2017 20:53:31 +0800
Subject: clusters/psformalism: Remove config "f_darkmatter"

Use "1 - baryon_fraction = 1 - Ob0/Om0" to replace "f_darkmatter".
---
 fg21sim/utils/cosmology.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'fg21sim/utils/cosmology.py')

diff --git a/fg21sim/utils/cosmology.py b/fg21sim/utils/cosmology.py
index d66de09..cc347e4 100644
--- a/fg21sim/utils/cosmology.py
+++ b/fg21sim/utils/cosmology.py
@@ -248,6 +248,16 @@ class Cosmology:
         """
         return self.Ob0 / self.Om0
 
+    @property
+    def darkmatter_fraction(self):
+        """
+        The cosmological mean dark matter fraction (w.r.t. matter),
+        assumed to be *constant* regardless of redshifts!
+
+        See also: ``self.baryon_fraction``
+        """
+        return 1 - self.baryon_fraction
+
     def overdensity_virial(self, z):
         """
         Calculate the virial overdensity, which generally used to
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