Skeleton of HMC/Integrators

lib/qcd/hmc/integrators/Integrator_base.cc

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+/*! 
+  @file Integrator_base.cc
+  @brief utilities for MD including funcs to generate initial HMC momentum
+ */
+
+
+#include <Grid.h>
+
+static const double sq3i = 1.0/sqrt(3.0);
+
+namespace Grid{
+  namespace QCD{
+
+    
+
+    void MDutils::generate_momenta_su3(LatticeColourMatrix& P,GridParallelRNG& pRNG){
+      SU3::GaussianLieAlgebraMatrix(pRNG, P);
+    }
+
+
+  }
+}

lib/qcd/hmc/integrators/Integrator_base.h

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+//--------------------------------------------------------------------
+/*! @file Integrator_base.h
+ * @brief Declaration of classes for the abstract Molecular Dynamics integrator
+ *
+ * @author Guido Cossu
+ */
+//--------------------------------------------------------------------
+
+#ifndef INTEGRATOR_INCLUDED
+#define INTEGRATOR_INCLUDED
+
+class Action;
+class RandNum;
+class Observer;
+
+typedef std::vector<Action*> ActionLevel;
+typedef std::vector<ActionLevel> ActionSet;
+typedef std::vector<Observer*> ObserverList;
+
+/*! @brief Abstract base class for Molecular Dynamics management */
+
+namespace Grid{
+  namespace QCD{
+    
+    class Integrator{
+    private:
+      virtual void update_P(int lv,double ep) = 0;
+      virtual void update_U(double ep) = 0;
+      
+      virtual void register_observers() = 0;
+      virtual void notify_observers() = 0;
+      
+    public:
+      virtual ~Integrator(){}
+      virtual void init(const LatticeColourMatrix&,
+			const GridParallelRNG& RNG)=0;
+      virtual double S()const =0;
+      virtual void integrate(int level) =0;
+      virtual const LatticeColourMatrix get_U() const =0;
+      
+      void generate_momenta(LatticeColourMatrix& P,const RandNum& rand);
+    };
+    
+    namespace MDutils{
+      void generate_momenta_su3(LatticeColourMatrix& P,GridParallelRNG& RNG);
+    }
+    
+  }
+}
+#endif//INTEGRATOR_INCLUDED