1 files changed, 51 insertions, 0 deletions
diff --git a/torus_symmetries.hpp b/torus_symmetries.hpp
index 53f61ac..829c886 100644
--- a/torus_symmetries.hpp
+++ b/torus_symmetries.hpp
@@ -122,3 +122,54 @@ Gen<double, D, TorusGroup<double, D>, S> uniformGenTorus(double L) {
   };
 }
 
+template <int D, class S>
+Gen<double, D, TorusGroup<double, D>, S> rotateSwapTorus(double L, double ε) {
+  return [L, ε](Model<double, D, TorusGroup<double, D>, S>& M,
+             Rng& rng) -> Transformation<double, D, TorusGroup<double, D>, S>* {
+    Spin<double, D, S>* s1 = rng.pick(M.s);
+    Spin<double, D, S>* s2 = rng.pick(M.s);
+
+    while (s1 == s2) {
+      s2 = rng.pick(M.s);
+    }
+
+    Vector<double, D> t1 = s1->x;
+    Vector<double, D> t2 = s2->x;
+    Vector<double, D> t = (t1 + t2) / 2;
+
+    t(0) = mod(t(0) + rng.variate<double>(0, ε), L);
+    t(1) = mod(t(1) + rng.variate<double>(0, ε), L);
+
+    Matrix<double, D> m;
+
+    m(0, 0) = -1;
+    m(1, 1) = -1;
+    m(0, 1) = 0;
+    m(1, 0) = 0;
+
+    TorusGroup<double, D> g(L, t - m * t, m);
+
+    return new PairFlip<double, D, TorusGroup<double, D>, S>(M, g, s1, s2);
+  };
+}
+
+template <int D, class S>
+Gen<double, D, TorusGroup<double, D>, S> nudgeGenTorus(double L, double ε) {
+  std::vector<Matrix<double, D>> torusMatrices = torus_mats<double, D>();
+  return [L, ε,
+          torusMatrices](Model<double, D, TorusGroup<double, D>, S>& M,
+                         Rng& rng) -> Transformation<double, D, TorusGroup<double, D>, S>* {
+    Matrix<double, D> m = rng.pick(torusMatrices);
+    Spin<double, D, S>* s = rng.pick(M.s);
+    Vector<double, D> t = s->x;
+
+    for (unsigned i = 0; i < D; i++) {
+      t(i) = mod(t(i) + rng.variate<double>(0, ε), L);
+    }
+
+    TorusGroup<double, D> g = TorusGroup<double, D>({(double)L, t - m * t, m});
+
+    return new SpinFlip<double, D, TorusGroup<double, D>, S>(M, g, s);
+  };
+}
+