NRTidalv2 Pv2 aligned-frame additive-term receipt — 27 September 2026

Result: The frozen aligned-frame, signed additive tidal term passed for Torch and JAX CPU FP64 across the printed merger/taper interval. The gate does not qualify a complete precessing waveform.

The frozen specification defines the Eq. (24) contribution with the printed 2PN, 3PN and 3.5PN self-spin phase. It fixes three spinning positive-Lambda systems, ten frequencies per system, and a 1e-10 relative complex limit with no alignment or fitting. The additional 3.5PN term is demonstrably nontrivial at 800 Hz in the frozen equal-mass case. The strictly post-taper term is exactly zero in both frontends. The maintained test is tests/test_nrtidalv2_pv2_aligned_additive_terms_math_reference.py.

Execution: host len, cwd /home/xangma/tmp/diffgw-nrtidalv2-pv2-additive-20260927, Linux CPU FP64, Python 3.12.3, Torch 2.14.0+cpu, JAX 0.11.2, pytest 9.1.1 and mpmath 1.3.0. Read-only host/environment/disk diagnostics preceded the temporary checkout copy. The validation command was:

PYTHONPATH=src:tests JAX_ENABLE_X64=1 OMP_NUM_THREADS=1 \
/home/xangma/.cache/diffgw-taylorf2-hm-venv/bin/python -m pytest -q \
  tests/test_nrtidalv2_pv2_aligned_additive_terms_math_reference.py \
  tests/test_nrtidalv2_paper_d_composition_math_reference.py \
  tests/test_nrtidalv2_self_spin_math_reference.py \
  tests/test_nrtidalv2_phase_math_reference.py \
  tests/test_nrtidalv2_amplitude_math_reference_native.py \
  tests/test_nrtidal_reference.py tests/test_nrtidal.py

Result: 91 passed, 1 skipped in 25.19 s. The skip is the pre-existing optional LALSimulation/PyCBC check in tests/test_nrtidal.py. The foreground SSH command completed in 27.5 s; no job remains. The earlier narrower run passed 62 tests in 17.48 s. No package update was needed.

No pinned-LAL binary gate was added: this checkout has no native IMRPhenomPv2_NRTidalv2 assembly to compare under an exact binary convention. The paper places the corrections before precession rotation, so applying the Eq. (24) absolute amplitude directly to final plus/cross polarizations would not be this published contract. The printed Love–Q/Fig. 7 and merger-frequency/binary discrepancies remain as recorded in the prior self-spin and provenance receipts. Historical binary_compatible behavior was untouched.