return 0;
}
+static unsigned check_equal_simplify(const ex &e1, const ex &e2, const scalar_products &sp)
+{
+ ex e = simplify_indexed(e1, sp) - e2;
+ if (!e.is_zero()) {
+ clog << "simplify_indexed(" << e1 << ")-" << e2 << " erroneously returned "
+ << e << " instead of 0" << endl;
+ return 1;
+ }
+ return 0;
+}
+
static unsigned delta_check(void)
{
// checks identities of the delta tensor
unsigned result = 0;
- symbol s_mu("mu"), s_nu("nu"), s_rho("rho"), s_sigma("sigma");
- varidx mu(s_mu, 4), nu(s_nu, 4), rho(s_rho, 4), sigma(s_sigma, 4);
+ symbol s_mu("mu"), s_nu("nu"), s_rho("rho"), s_sigma("sigma"), s_tau("tau");
+ symbol d("d");
+ varidx mu(s_mu, 4), nu(s_nu, 4), rho(s_rho, 4), sigma(s_sigma, 4), tau(s_tau, 4);
// antisymmetry
result += check_equal(lorentz_eps(mu, nu, rho, sigma) + lorentz_eps(sigma, rho, mu, nu), 0);
result += check_equal(lorentz_eps(mu, nu, mu.toggle_variance(), nu.toggle_variance()), 0);
result += check_equal_simplify(lorentz_g(mu.toggle_variance(), nu.toggle_variance()) * lorentz_eps(mu, nu, rho, sigma), 0);
+ // contraction with symmetric tensor is zero
+ result += check_equal_simplify(lorentz_eps(mu, nu, rho, sigma) * indexed(d, indexed::symmetric, mu.toggle_variance(), nu.toggle_variance()), 0);
+ result += check_equal_simplify(lorentz_eps(mu, nu, rho, sigma) * indexed(d, indexed::symmetric, nu.toggle_variance(), sigma.toggle_variance(), rho.toggle_variance()), 0);
+ ex e = lorentz_eps(mu, nu, rho, sigma) * indexed(d, indexed::symmetric, mu.toggle_variance(), tau);
+ result += check_equal_simplify(e, e);
+
return result;
}
unsigned result = 0;
- symbol s_i("i"), s_j("j"), s_k("k");
- idx i(s_i, 3), j(s_j, 3), k(s_k, 3);
- symbol A("A");
- ex e, e1, e2;
+ idx i(symbol("i"), 3), j(symbol("j"), 3), k(symbol("k"), 3), l(symbol("l"), 3);
+ symbol A("A"), B("B");
+ ex e;
result += check_equal(indexed(A, indexed::symmetric, i, j), indexed(A, indexed::symmetric, j, i));
result += check_equal(indexed(A, indexed::antisymmetric, i, j) + indexed(A, indexed::antisymmetric, j, i), 0);
result += check_equal(indexed(A, indexed::antisymmetric, i, j, k) - indexed(A, indexed::antisymmetric, j, k, i), 0);
+ e = indexed(A, indexed::symmetric, i, j, k) *
+ indexed(B, indexed::antisymmetric, l, k, i);
+ result += check_equal_simplify(e, 0);
+ e = indexed(A, indexed::symmetric, i, i, j, j) *
+ indexed(B, indexed::antisymmetric, k, l); // GiNaC 0.8.0 had a bug here
+ result += check_equal_simplify(e, e);
+
+ return result;
+}
+
+static unsigned scalar_product_check(void)
+{
+ // check scalar product replacement
+
+ unsigned result = 0;
+
+ idx i(symbol("i"), 3), j(symbol("j"), 3);
+ symbol A("A"), B("B"), C("C");
+ ex e;
+
+ scalar_products sp;
+ sp.add(A, B, 0); // A and B are orthogonal
+ sp.add(A, C, 0); // A and C are orthogonal
+ sp.add(A, A, 4); // A^2 = 4 (A has length 2)
+
+ e = (indexed(A + B, i) * indexed(A + C, i)).expand(expand_options::expand_indexed);
+ result += check_equal_simplify(e, indexed(B, i) * indexed(C, i) + 4, sp);
+ e = indexed(A, i, i) * indexed(B, j, j); // GiNaC 0.8.0 had a bug here
+ result += check_equal_simplify(e, e, sp);
return result;
}
return result;
}
+static unsigned spinor_check(void)
+{
+ // check identities of the spinor metric
+
+ unsigned result = 0;
+
+ symbol psi("psi");
+ spinidx A(symbol("A"), 2), B(symbol("B"), 2), C(symbol("C"), 2);
+ ex A_co = A.toggle_variance(), B_co = B.toggle_variance();
+ ex e;
+
+ e = spinor_metric(A_co, B_co) * spinor_metric(A, B);
+ result += check_equal_simplify(e, 2);
+ e = spinor_metric(A_co, B_co) * spinor_metric(B, A);
+ result += check_equal_simplify(e, -2);
+ e = spinor_metric(A_co, B_co) * spinor_metric(A, C);
+ result += check_equal_simplify(e, delta_tensor(B_co, C));
+ e = spinor_metric(A_co, B_co) * spinor_metric(B, C);
+ result += check_equal_simplify(e, -delta_tensor(A_co, C));
+ e = spinor_metric(A_co, B_co) * spinor_metric(C, A);
+ result += check_equal_simplify(e, -delta_tensor(B_co, C));
+ e = spinor_metric(A, B) * indexed(psi, B_co);
+ result += check_equal_simplify(e, indexed(psi, A));
+ e = spinor_metric(A, B) * indexed(psi, A_co);
+ result += check_equal_simplify(e, -indexed(psi, B));
+ e = spinor_metric(A_co, B_co) * indexed(psi, B);
+ result += check_equal_simplify(e, -indexed(psi, A_co));
+ e = spinor_metric(A_co, B_co) * indexed(psi, A);
+ result += check_equal_simplify(e, indexed(psi, B_co));
+
+ return result;
+}
+
unsigned exam_indexed(void)
{
unsigned result = 0;
result += metric_check(); cout << '.' << flush;
result += epsilon_check(); cout << '.' << flush;
result += symmetry_check(); cout << '.' << flush;
+ result += scalar_product_check(); cout << '.' << flush;
result += edyn_check(); cout << '.' << flush;
+ result += spinor_check(); cout << '.' << flush;
if (!result) {
cout << " passed " << endl;