Using_auxiliary_parameters_in_SPheno.md

+---
+title: Using auxiliary parameters in SPheno
+permalink: /Using_auxiliary_parameters_in_SPheno/
+---
+
+[Category:SPheno](/Category:SPheno "wikilink") In some cases it might be helpful or necessary to use parameters in `SPheno.m` which are not part of the model. For this purpose, one can use the list
+
+    AuxiliaryParametersSPheno={List of Parameters};
+
+All parameters part of this are then initialised in SPheno and can be used.
+Note, this is not necessary if one wants to use temporary values in a set of boundary conditions. In that case, SARAH automatically initialises such parameters.
+
+Examples
+--------
+
+1.  **Explicit definition of auxiliary parameters**: So far, this option is only used for the case of [Models with several generations of Higgs doublets](/Models_with_several_generations_of_Higgs_doublets "wikilink") where additional ratios of VEVs are needed to be used:
+        AuxiliaryParametersSPheno={
+        "Real(dp) :: tanbQ, tanBUQ, tanbDQ"
+        };
+
+2.  **Implicit use of temporary parameters**: The rotation of the running gauge couplings in the presence of gauge-kinetic mixing to the triangle basis can be performed via
+        BoundarySUSYScale = {
+         {g1T,(g1*gBL-g1BL*gBL1)/Sqrt[gBL^2+gBL1^2]},
+         {gBLT, Sqrt[gBL^2+gBL1^2]},
+         {g1BLT,(g1BL*gBL+gBL1*g1)/Sqrt[gBL^2+gBL1^2]},
+         {g1, g1T},
+         {gBL, gBLT},
+         {g1BL, g1BLT},
+         {gBL1,0},
+         ...
+
+    Here, `g1T`, `gBLT` and `g1BLT` are not defined before but only used to perform these rotations in SPheno.
+
+See also
+--------
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