95 lignes
2.6 KiB
C++
95 lignes
2.6 KiB
C++
/**********************************************************
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This software is part of J.-S. Caux's ABACUS library.
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Copyright (c) J.-S. Caux.
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-----------------------------------------------------------
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File: ABACUS_Bethe.h
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Purpose: Declares Bethe state-related classes and functions.
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Status: IN DEVELOPMENT
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***********************************************************/
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#ifndef ABACUS_BETHE_H
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#define ABACUS_BETHE_H
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#include "ABACUS.h"
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namespace ABACUS {
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class Base {
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public:
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int charge; // charge of the base: number of particles (LiebLin gas), number of down spins (Heis), ...
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Vect<int> Nrap; // Nrap[i] contains the number of rapidities of type i, i = 0, ..., Nstrings - 1.
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int Nraptot; // total number of strings in this state
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Vect<DP> Ix2_infty; // Ix2_infty[i] contains the max of BAE function for the (half-)integer I[i], i = 0, Nstrings - 1.
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Vect<int> Ix2_min;
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Vect<int> Ix2_max; // Ix2_max[i] contains the integer part of 2*I_infty, with correct parity for base.
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string baselabel;
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public:
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Base ();
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Base (const Base& RefBase); // copy constructor
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public: // LiebLin constructors
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Base (int N); // Constructor for repulsive LiebLin gas case: one type of particle
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public: // HEIS constructors
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Base (const Heis_Chain& RefChain, const Vect<int>& Nrapidities); // sets to Nrapidities vector, and checks consistency
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Base (const Heis_Chain& RefChain, string baselabel_ref);
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public: // operators
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Base& operator= (const Base& RefBase);
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bool operator== (const Base& RefBase);
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bool operator!= (const Base& RefBase);
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public: // member functions
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void Compute_Ix2_limits(const Heis_Chain& RefChain); // computes the Ix2_infty and Ix2_max
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};
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//****************************************************************************
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// Class Bethe_State is a wrapper class for all types of eigenstates
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class Bethe_State {
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public: // configuration
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Base base;
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Vect<Vect<int> > Ix2;
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Vect<Vect<DP> > lambda;
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public: // properties
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DP E;
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int iK;
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DP K;
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DP lnnorm;
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public: // identification
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string label; // this is the relative label by default
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Vect<Vect<int> > OriginIx2; // to define the relative label
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public: // convergence
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DP diffsq;
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int conv;
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int iter;
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int iter_Newton;
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public: // constructors
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Bethe_State();
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Bethe_State (const Bethe_State& RefState); // copy constructor
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Bethe_State (const Bethe_State& OriginState, string label_ref);
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LiebLin_Bethe_State& operator= (const LiebLin_Bethe_State& RefState);
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} // namespace ABACUS
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#endif
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