Published in arXiv, 2025
Combines nuclear-physics meta-model at low density with GP at high density to infer NS EOS from multi-messenger data.
Recommended citation: Ng, S., Legred, I., Suleiman, L., Landry, P., Traylor, L., & Read, J. (2025). "Inferring the neutron star equation of state with nuclear-physics informed semiparametric models." arXiv.
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Published in arXiv, 2025
Integrates pQCD constraints into a GP-based EOS extending from crust through ultra-high densities.
Recommended citation: Finch, E., Legred, I., Chatziioannou, K., Essick, R., Han, S., & Landry, P. (2025). "Unified nonparametric equation-of-state inference from the neutron-star crust to perturbative-QCD densities." arXiv.
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Published in arXiv, 2025
Hybrid GP + relativistic mean-field hybrid EOS models to study breakdown scales via future observations.
Recommended citation: Legred, I., Brodie, L., Haber, A., Essick, R., & Chatziioannou, K. (2025). "Nonparametric extensions of nuclear equations of state: probing the breakdown scale of relativistic mean-field theory." arXiv.
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Published in Physical Review D, 2025
Joint inference of EOS and population differences between Galactic and GW observed neutron stars.
Recommended citation: Golomb, J., Legred, I., Chatziioannou, K., & Landry, P. (2025). "The interplay of astrophysics and nuclear physics in determining the properties of neutron stars." Phys. Rev. D.
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Published in The Astrophysical Journal Letters, 2024
Simulates Alfvén waves from tidal excitations, predicting electromagnetic precursors before NS mergers.
Recommended citation: Most, E. R., Kim, Y., Chatziioannou, K., & Legred, I. (2024). "Nonlinear Alfvén-wave dynamics and premerger emission from crustal oscillations in neutron star mergers." ApJL. 973, L37.
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Published in Physical Review D, 2024
Classifies whether low-mass merger components are NS or BH using tidal/ EOS inference.
Recommended citation: Golomb, J., Legred, I., Chatziioannou, K., Dietrich, T., et al. (2024). "Using equation of state constraints to classify low-mass compact binary mergers." Phys. Rev. D.
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Published in Physical Review D, 2024
Re-evaluates universal NS relations (e.g. I-Love-Q) using flexible Gaussian-process EOS models.
Recommended citation: Legred, I., Sy-Garcia, B. O., Chatziioannou, K., & Essick, R. (2024). "Assessing equation of state-independent relations for neutron stars with nonparametric models." Phys. Rev. D. 109, 023020.
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Published in Physical Review D, 2023
Explores potential phase-transition behavior in dense matter with nonparametric EOS models.
Recommended citation: Essick, R., Legred, I., Chatziioannou, K., Han, S., & Landry, P. (2023). "Phase transition phenomenology with nonparametric representations of the neutron star equation of state." Phys. Rev. D. 108, 043013.
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Published in Physical Review D, 2023
Introduces an enthalpy-based EOS parametrization implemented in SpECTRE simulations of neutron stars.
Recommended citation: Legred, I., Kim, Y., Deppe, N., Chatziioannou, K., Foucart, F., Hébert, F., Kidder, L. E. (2023). "Simulating neutron stars with a flexible enthalpy-based equation of state parametrization in SpECTRE." Phys. Rev. D. 107, 123017.
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Published in Physical Review D, 2022
Parametric models impose hidden correlations across density scales in neutron star EOS inference.
Recommended citation: Legred, Isaac N., Chatziioannou, K., Essick, R., & Landry, P. (2022). "Implicit correlations within phenomenological parametric models of the neutron star equation of state." Phys. Rev. D. 105, 043016.
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Published in Phys. Rev. D, 2021
Recommended citation: Isaac Legred, Katerina Chatziioannou, Reed Essick, Sophia Han, Philippe Landry, "Impact of the PSR \({\mathrm J0740+6620}\) radius constraint on the properties of high-density matter." Phys. Rev. D, 2021.
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