Hao-Jui Kuan 官顥叡

Postdoctoral Researcher — University of Illinois Urbana-Champaign

Gravitational waves · Neutron star mergers · Modified gravity

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About

Hao-Jui Kuan

I come from Hsinchu, a county in northern Taiwan, where I completed my Bachelor's degree with double majors in Physics and Mathematics. I then joined the group of Prof. Chao-Qiang Geng in Hsinchu for doctoral training. In 2019, I pursued a joint PhD between Nat'l Tsing Hua University (Taiwan) and the University of Tübingen (Germany), working in Prof. Kostas Kokkotas' group. I defended my thesis at the end of 2022 and received the degree in early 2023. I subsequently joined the Albert Einstein Institute in Golm under Prof. Masaru Shibata. I am currently a postdoctoral researcher at the University of Illinois Urbana-Champaign, working with Prof. Nicolas Yunes.

ORCID INSPIRE NASA ADS

Research

My work centers on probing the equation of state of nuclear matter and testing gravity in the strong-field regime using gravitational waves from neutron star mergers. I study how structural properties of neutron stars — tidal responses, quasi-normal mode spectra, elastic crusts, and rotation — imprint on the gravitational waveform, both in general relativity and in modified theories of gravity.

Precursor flares of short gamma-ray bursts

A few precursor flares have been detected for SGRBs, possibly linked to tidal resonances in coalescing binaries. As the orbital frequency sweeps through a stellar mode frequency, resonant excitation stresses the crust to the breaking point. Matching precursor timing to mode frequencies enables asteroseismology of the flaring star, constraining the nuclear equation of state and stellar spin.

Waveforms of binary neutron stars in GR and beyond

Gravitational waves encode orbital dynamics and tidal physics with high purity. I investigate late-time waveform contributions — dynamical tides, f-mode imprints, and post-merger signatures — in both general relativity and modified gravity. Exclusive signatures of beyond-GR theories can serve as unambiguous tests of the fundamental nature of gravity.

Publications

16Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities

17Magnetar-powered neutrinos and magnetic moment signatures at IceCube

18Binary neutron star mergers in massive scalar-tensor theory: Properties of postmerger remnants

19Premerger Phenomena in Neutron Star Binary Coalescences

20Accessing Universal Relations of Binary Neutron Star Waveforms in Massive Scalar-Tensor Theory

21Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory

22Tidal Resonance in Binary Neutron Star Inspirals: A High-Precision Study in Numerical Relativity

23Non-linear saturation of gravito-inertial modes excited by tidal resonances in binary neutron stars

24Nonradial oscillations of stratified neutron stars with solid crusts: Mode characterization and tidal resonances in coalescing binaries

25Convective stability analysis of massive neutron stars formed in binary mergers

26The error budget of binary neutron star merger simulations for configurations with high spin

27g-mode resonance in dissipative and reactive neutron stars during inspirals

8Gravitational Waves from Accretion-Induced Descalarization in Massive Scalar-Tensor Theory

9Constraining equation-of-state groups from g-mode asteroseismology

10f-mode imprints on gravitational waves from coalescing binaries involving aligned spinning neutron stars

11Quasi-periodic oscillations in precursor flares via seismic aftershocks from resonant shattering

12Dynamical scalarization during neutron star mergers in scalar-Gauss-Bonnet theory

13Measuring spin in coalescing binaries of neutron stars that show double precursors

14Binary neutron star mergers in massive scalar-tensor theory: Quasiequilibrium states and dynamical enhancement of the scalarization

15Last three seconds: Packed message delivered by tides in binary neutron star mergers

1Viable constraint on scalar field in scalar–tensor theory

2Inverse-chirp imprint of gravitational wave signals in scalar tensor theory

3Dynamical Formation of Scalarized Black Holes and Neutron Stars through Stellar Core Collapse

4Nonlinear evolution and nonuniqueness of scalarized neutron stars

5Scalar gravitational wave signals from core collapse in massive scalar–tensor gravity with triple-scalar interactions

6General-relativistic treatment of tidal g-mode resonances in coalescing binaries of neutron stars – I. Theoretical framework and crust breaking

7General-relativistic treatment of tidal g-mode resonances in coalescing binaries of neutron stars – II. As triggers for precursor flares of short gamma-ray bursts

Software

Kadath-AEI

A privately maintained branch of the FUKA initial-data library, optimized for binary neutron star configurations. Features a 10× speedup, 70% memory reduction via a sparse matrix solver, and a new 2D axisymmetric solver.

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Curriculum Vitae Publication List