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smsharma

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clax
Differentiable Boltzmann solver for cosmology in JAX

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sound_horizon_drag uses a ~0.12%-accurate fitting formula but the stated r_s target is <0.01% — 0.150% error at omega_b +20% Open

bug

smsharma/clax#44 · 1 assignee · Opened Sep 6, 2026
No PPF for fluid dark energy: w0waCDM linear P_cb diverges from CLASS near the horizon, worst where w(a) crosses -1 Open

bug

smsharma/clax#43 · 1 assignee · Opened Sep 6, 2026
Linear P_cb vs CLASS-PT: scale-independent -0.34% offset at z=0, plus oscillatory ~0.5% for k>0.2 (target <0.1%) Open

bug

smsharma/clax#42 · 1 comment · 1 assignee · Opened Sep 6, 2026

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