MomentumCorrFunc.hpp

/*
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 *    notice, this list of conditions and the following disclaimer in the
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 * using, modifying or distributing the software or its
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 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *                                                                      
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).          
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 */
 
 /* Uses the Helfand-moment method for calculating thermal
  * conductivity using the relation kappa = (N,V)lim(t)->inf 1/(2*k_B*T^2*V*t) <[G_K(t)-G_K(0)]^2>
  * where G_K is the Helfand moment for thermal conductivity definded as
  * G_K(t) = sum_{a=1}{^N} x_a(E_a-<E_a>) and E_a is defined to be
  *     E_a = p_2^2/(2*m)+1/2 sum_{b.ne.a} u(r_ab) where p is momentum and u is pot energy for the 
  * particle pair a-b. This routine calculates E_a, <E_a> and does the correlation
  * <[G_K(t)-G_K(0)]^2>.
  * See Viscardy et al. JCP 126, 184513 (2007)
  */
 
 
#ifndef APPLICATIONS_DYNAMICPROPS_MOMENTUMCORRFUNC_HPP
#define APPLICATIONS_DYNAMICPROPS_MOMENTUMCORRFUNC_HPP
 
#include "applications/dynamicProps/FrameTimeCorrFunc.hpp"
 
namespace OpenMD {
 
  class MomentumCorrFunc : public FrameTimeCorrFunc<Mat3x3d> {
  public:
    MomentumCorrFunc(SimInfo* info, const std::string& filename,
                     const std::string& sele1, const std::string& sele2);   
        
  private:
    virtual void computeProperty(int frame);
    virtual Mat3x3d calcCorrVal(int frame1, int frame2);
 
    std::vector<Mat3x3d> histogram_;
    
  };
 
}
#endif //MOMENTUMCORRFUNC