Simple Gaussian benchmark

calculations/MT-V.jl

@@ -1,13 +1,13 @@
 # Malfliet–Tjon V (MT-V) — the standard few-body benchmark
-# Reference 2-body bound state: E₂ ≈ −0.4107 MeV
+# Reference 2-body bound state: E₂ ≈ −0.41 MeV
 
 include("../Hamiltonian.jl")
 mode = cpu_tensor
 T = Float32 # single-precision mode
 
-V_R = +1438.72 # MeV·fm   
+V_R = 1458.05 # MeV·fm   
 μ_R = 3.11 # fm⁻¹
-V_A = −626.885 # MeV·fm 
+V_A = -578.09 # MeV·fm 
 μ_A = 1.55 # fm⁻¹
 
 r2_reg = 0.000001 # fm², regularization parameter to avoid singularity at r=0

calculations/simple_gaussian.jl

@@ -0,0 +1,32 @@
+# Simple Gaussian benchmark, with units
+# Expected 2-body bound state: E₂ ≈ -1.00 MeV
+
+include("../Hamiltonian.jl")
+mode = cpu_tensor
+T = Float32 # single-precision mode
+
+V_0 = -38.4671 # MeV
+r_0 = 2 # fm
+
+V_benchmark(r2) = V_0 * exp(−r2 / r_0^2)
+
+m_N = 939.565 # MeV/c²
+ħ = 197.327 # MeV·fm/c
+
+μ = (m_N / 2) / ħ^2
+
+ϕ = 0
+d = 3
+n = 2
+N = 80
+L = 40 # fm
+n_imag = 1
+
+s = system{T}(d, n, N, L, μ)
+H = Hamiltonian{T}(s, V_benchmark, ϕ, n_imag, mode)
+@time evals, _, info = eig(H, 3, resonances = false)
+
+sort!(evals)
+display(evals[1:3])
+
+# Result = -1.001821 MeV