SKAO Pulsar Timing to Deliver Moment-of-Inertia Constraints on Cold Ultra-Dense Matter
SKAO pulsar observations will supply new moment-of-inertia and glitch observables to probe neutron-star interiors. The approach complements NICER and gravitational-wave data but requires careful modeling of superfluid dynamics. Multi-facility coordination will be essential to isolate QCD effects from alternative physics.
The 2026 arXiv review by Basu et al. outlines how SKAO's sensitivity and survey speed will expand the sample of precisely timed isolated and binary pulsars. Radio timing yields mass, spin-down, and glitch recurrence data that map to interior superfluid dynamics and the pressure-density relation at supranuclear densities, regimes inaccessible to terrestrial accelerators.
NICER radius measurements and LIGO-Virgo tidal deformability results already exclude the stiffest EOS models, yet both techniques average over global structure. SKAO-derived moments of inertia break this degeneracy by providing an independent integral constraint on the density profile, while glitch monitoring probes neutron superfluid fractions that current X-ray and gravitational-wave data cannot access.
Key limitations include model dependence in converting glitch sizes to superfluid moments and the small number of systems with measurable precession. Multi-messenger synergies with next-generation X-ray telescopes and third-generation gravitational-wave detectors will be required to separate modified-gravity or dark-matter effects from QCD-matter signatures.
Commissioning data from SKAO-Mid in 2027–2029 should yield the first statistically robust inertia measurements; full-array operations by 2032 will test whether current EOS posteriors remain consistent at the 3-sigma level.
SKAO: Publication of first moment-of-inertia measurements for 10+ pulsars with 10% fractional uncertainty within 4 years of full operations.
Sources (3)
- [1]Primary Source(https://arxiv.org/abs/2607.02597)
- [2]Supporting Source(https://arxiv.org/abs/1805.11581)
- [3]Supporting Source(https://arxiv.org/abs/2004.00022)