From 269800bb4c7d579afea935ae030bffaa0d3471c4 Mon Sep 17 00:00:00 2001
From: bcarreres <carreres@cppm.in2p3.fr>
Date: Thu, 29 Feb 2024 08:55:55 -0500
Subject: [PATCH] symplify formula for M0 scaling

---
 snsim/utils.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/snsim/utils.py b/snsim/utils.py
index 8303431..1b25469 100644
--- a/snsim/utils.py
+++ b/snsim/utils.py
@@ -187,9 +187,7 @@ def scale_M0_cosmology(h, M0_art, h_art):
         Scaled SN Absolute Magnitude.
 
     """
-
-    dh = (h_art - h) / h
-    return M0_art - 5 * np.log10(1 + dh)
+    return M0_art + 5 * np.log10(h / h_art)
 
 
 def init_astropy_time(date):