fill in missing rho methods

rho_b, rho_dm, rho_gamma, rho_nu

Signed-off-by: nstarman <[email protected]>

src/cosmology/api/flrw.py

@@ -47,7 +47,6 @@ class FLRWAPIConformant(CosmologyAPIConformant, Protocol):
     """Baryon density parameter at redshift 0."""
 
     # ==============================================================
-    # Derived properties
 
     @property
     def scale_factor0(self) -> Array:
@@ -395,6 +394,22 @@ def rho_k(self, z: Array, /) -> Array:
         """Redshift-dependent curvature density in Msol Mpc-3."""
         ...
 
+    def rho_gamma(self, z: Array, /) -> Array:
+        """Redshift-dependent photon density in Msol Mpc-3."""
+        ...
+
+    def rho_nu(self, z: Array, /) -> Array:
+        """Redshift-dependent neutrino density in Msol Mpc-3."""
+        ...
+
+    def rho_b(self, z: Array, /) -> Array:
+        """Redshift-dependent baryon density in Msol Mpc-3."""
+        ...
+
+    def rho_dm(self, z: Array, /) -> Array:
+        """Redshift-dependent dark matter density in Msol Mpc-3."""
+        ...
+
     # ----------------------------------------------
     # Time
 

tests/api/conftest.py

@@ -164,6 +164,10 @@ def flrw_meths() -> set[str]:
         "rho_m",
         "rho_de",
         "rho_k",
+        "rho_b",
+        "rho_dm",
+        "rho_gamma",
+        "rho_nu",
         "age",
         "lookback_time",
         "comoving_distance",