* Interface to GiNaC's color (SU(3) Lie algebra) objects. */
/*
- * GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __GINAC_COLOR_H__
#include "indexed.h"
#include "tensor.h"
+#include <set>
+
namespace GiNaC {
* of SU(3), as used for calculations in quantum chromodynamics. A
* representation label (an unsigned 8-bit integer) is used to distinguish
* elements from different Lie algebras (objects with different labels
- * commute). These objects implement an abstract representation of the
+ * commutate). These objects implement an abstract representation of the
* group, not a specific matrix representation. The indices used for color
* objects should not have a variance. */
class color : public indexed
{
GINAC_DECLARE_REGISTERED_CLASS(color, indexed)
-
// other constructors
public:
color(const ex & b, unsigned char rl = 0);
// internal constructors
color(unsigned char rl, const exvector & v, bool discardable = false);
- color(unsigned char rl, exvector * vp); // vp will be deleted
+ color(unsigned char rl, std::auto_ptr<exvector> vp);
+ void archive(archive_node& n) const;
+ void read_archive(const archive_node& n, lst& sym_lst);
// functions overriding virtual functions from base classes
protected:
ex eval_ncmul(const exvector & v) const;
bool match_same_type(const basic & other) const;
ex thiscontainer(const exvector & v) const;
- ex thiscontainer(exvector * vp) const;
+ ex thiscontainer(std::auto_ptr<exvector> vp) const;
unsigned return_type() const { return return_types::noncommutative; }
- unsigned return_type_tinfo() const { return TINFO_color + representation_label; }
+ return_type_t return_type_tinfo() const;
// non-virtual functions in this class
public:
private:
unsigned char representation_label; /**< Representation label to distinguish independent color matrices coming from separated fermion lines */
};
+GINAC_DECLARE_UNARCHIVER(color);
/** This class represents the su(3) unity element. */
void do_print(const print_context & c, unsigned level) const;
void do_print_latex(const print_latex & c, unsigned level) const;
};
+GINAC_DECLARE_UNARCHIVER(su3one);
/** This class represents an su(3) generator. */
class su3t : public tensor
void do_print(const print_context & c, unsigned level) const;
void do_print_latex(const print_latex & c, unsigned level) const;
};
+GINAC_DECLARE_UNARCHIVER(su3t);
/** This class represents the tensor of antisymmetric su(3) structure
* constants. */
// non-virtual functions in this class
protected:
+ unsigned return_type() const { return return_types::commutative; }
void do_print(const print_context & c, unsigned level) const;
void do_print_latex(const print_latex & c, unsigned level) const;
};
+GINAC_DECLARE_UNARCHIVER(su3f);
/** This class represents the tensor of symmetric su(3) structure constants. */
class su3d : public tensor
// non-virtual functions in this class
protected:
+ unsigned return_type() const { return return_types::commutative; }
void do_print(const print_context & c, unsigned level) const;
void do_print_latex(const print_latex & c, unsigned level) const;
};
+GINAC_DECLARE_UNARCHIVER(su3d);
// global functions
-/** Specialization of is_exactly_a<color>(obj) for color objects. */
-template<> inline bool is_exactly_a<color>(const basic & obj)
-{
- return obj.tinfo()==TINFO_color;
-}
-
/** Create the su(3) unity element. This is an indexed object, although it
* has no indices.
*
/** This returns the linear combination d.a.b.c+I*f.a.b.c. */
ex color_h(const ex & a, const ex & b, const ex & c);
+/** Calculate color traces over the specified set of representation labels.
+ *
+ * @param e Expression to take the trace of
+ * @param rls Set of representation labels */
+ex color_trace(const ex & e, const std::set<unsigned char> & rls);
+
+/** Calculate color traces over the specified list of representation labels.
+ *
+ * @param e Expression to take the trace of
+ * @param rll List of representation labels */
+ex color_trace(const ex & e, const lst & rll);
+
/** Calculate the trace of an expression containing color objects with a
* specified representation label.
*