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Open research questions in Pulsars and Gravitational Waves Research

411 gap statements mined from Pulsars and Gravitational Waves Research papers in our 7.9M-paper local library, which holds 2,333 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • It highlights the need for further research on the coexistence of superfluid and superconducting components. The authors discuss unresolved issues concerning vortex structure, flux-tube configurations, and the origin of pulsar glitches and postglitch relaxation.

    Spin effects in superfluidity, neutron matter, and neutron stars · 2026 · DOI

  • The lack of understanding of the gamma-ray emission from millisecond pulsars with large observed period derivatives. The need to investigate the orbital modulation and long-term variability of these pulsars.

    Discovery of Gamma-Ray Pulsations from the Millisecond Pulsar PSR J0435+3233 · 2026 · DOI

  • The formation and growth of intermediate-mass black holes in dense stellar environments is not well understood. The role of dynamical recoil and gravitational-wave recoil in ejecting IMBHs from dense star clusters is not well studied. The application of survival analysis to model the probability of IMBH binary ejection versus in-cluster merger is a novel approach.

    Survival Analysis of Intermediate-mass Black Holes in Dense Star Clusters · 2026 · DOI

  • The need to test the sensitivity of black hole mass functions to different merger criteria and initial mass functions.

    Orbital Migration of Interacting Stellar Mass Black Holes in Disks around Supermassive Black Holes. III. Mass Distribution of Hierarchical Mergers · 2026 · DOI

  • Black-hole perturbation theory remains remarkably accurate beyond its formal small-mass-ratio regime, but what limits this accuracy remains unclear.

    The shape of nonlinearity in binary-black-hole dynamics · 2026

  • The apparent uniqueness of PSR J1928+1815 is consistent with a short detectability lifetime, though formation rate estimates remain uncertain.

    Deep Adaptive Optics Imaging Rules Out a Helium Star Companion to PSR J1928+1815 · 2026 · DOI

  • If the eclipse is powered by a WD wind, the system is likely observed in a short-lived phase; alternatively, if the companion is an older WD, the origin of the eclipsing material remains unclear.

    Deep Adaptive Optics Imaging Rules Out a Helium Star Companion to PSR J1928+1815 · 2026 · DOI

  • The thermal evolution of neo-NSs with temperature-dependent crusts is not well understood. The impact of different equations of state on the thermal evolution of neo-NSs is not well studied.

    Thermal evolution of neo-neutron stars. II. Temperature-dependent crusts · 2026 · DOI

  • Until now, variations in Faraday rotation towards Vela have not been studied on timescales less than around a decade.

    Probing magneto-ionic microstructure towards the Vela pulsar using a prototype SKA-Low station · 2024 · DOI

  • Whether nature follows this description remains an open question, but the framework provides a consistent and testable foundation for further investigation.

    Simple Gravity: A Scalar Refractive Framework for Gravitational Phenomena · 2026 · DOI

  • Current astrophysical constraints on regularized 4D Einstein-Gauss-Bonnet gravity derive from binary neutron star systems and isolated pulsar observations, but the parameter space accessible through high-mass compact objects (the GW190814 event region) and its intersection with regularized field equation solutions remains underexplored.

    Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints · 2026 · DOI

  • Future research directions include the extension of the methods used in the paper to other types of gravitational-wave sources. Future research directions include the testing of modified gravity theories using gravitational-wave observations.

    Probing modified gravitational-wave dispersion with bursts from eccentric black-hole binaries · 2026 · DOI

  • The research gap identified by the paper is the need for a better understanding of the impact of dispersion effects on gravitational-wave bursts from highly eccentric binary black holes. The research gap identified by the paper is the need for new methods for modeling and testing modified gravity theories.

    Probing modified gravitational-wave dispersion with bursts from eccentric black-hole binaries · 2026 · DOI

  • The synthesis of heavier elements must proceed through astrophysical processes occurring at later cosmic times. The cosmic abundance patterns of hundreds of chemical elements and a vast number of isotopes are not well understood.

    Novae breves from magnetar giant flares: Potential probes of neutron star crusts · 2026 · DOI

  • The nature of the secondary component in the GW190814 event is unknown. The mass gap in compact objects is not well understood.

    Quarkyonic neutron stars as candidates for the GW230529 mass-gap object · 2026 · DOI

  • The gap is the need for a fully analytical method for calculating gravitational shadow parameters. The gap is the need to account for the effects of a plasma medium.

    Perturbation theory for gravitational shadows in Kerr-like spacetimes · 2026 · DOI

  • The paper identifies the need to overcome inertial limits in spatial warp metrics. The integration of Quantum Inertial Phase Dynamics with Lentz's metric is proposed to address this gap.

    Overcoming Inertial Limits in Lentz Solitons via Quantum Inertial Phase Dynamics · 2026 · DOI

  • The approach is limited to theories where supercooling is strong enough. The gravitational corrections to the false vacuum decay are amply negligible if the symmetry-breaking scale is small compared to the Planck mass.

    Supercooled Phase Transitions with Radiative Symmetry Breaking · 2026 · DOI

  • Direct observational confirmation of this alignment is currently limited to a single source in a supernova remnant (PSR J0538+2817), for which the three-dimensional velocity has been well constrained.

    Evidence for the spin-kick alignment of pulsars from the statistics of their magnetic inclinations · 2025 · DOI

  • On the other hand, image domain searches for pulsars are not limited by these effects and can extend the parameter space to regions inaccessible to traditional search techniques.

    Imaging pulsar census of the galactic plane using MWA VCS data · 2024 · DOI

  • The study only investigates the pulse-to-pulse variability of one pulsar, PSR J1857+0943, - The analysis is limited to observations at 1.25 GHz, - The study does not explore the physical mechanisms underlying the observed…

    Component-dependent Periodic Emission Variations of PSR J1857+0943 Observed with FAST · 2026 · DOI

  • Further studies of the pulse-to-pulse variability of other millisecond pulsars are needed to determine the universality of the observed behavior, - Investigations of the physical mechanisms underlying the observed variability are required, - Observations at multiple frequencies may provide additional insights into the emission…

    Component-dependent Periodic Emission Variations of PSR J1857+0943 Observed with FAST · 2026 · DOI

  • Investigating the thermal evolution of neo-neutron stars with different masses and rotation rates, - Exploring the effects of different EoSs and composition models on the cooling process, - Studying the impact of the crust's composition on the crystallization process and the contraction…

    Thermal evolution of neo-neutron stars. II. Temperature-dependent crusts · 2026 · DOI

  • The study only considers static spherically symmetric traversable wormholes, - The study assumes a small perturbation on the static wormhole background, - The numerical calculations are limited to a specific range…

    Self-force on a static scalar charge in traversable wormholes · 2026 · DOI

  • Further research could involve extending the mode-sum approach to more general wormhole spacetimes, - Investigating the self-force on a static scalar charge in non-static or non-spherically symmetric…

    Self-force on a static scalar charge in traversable wormholes · 2026 · DOI

Most-cited papers in Pulsars and Gravitational Waves Research

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Open questions raised by papers listed on this page include: (1) The lack of understanding of the gamma-ray emission from millisecond pulsars with large observed period derivatives (“Discovery of Gamma-Ray Pulsations from the Millisecond Pulsar PSR J0435+3233”, 2026); (2) The formation and growth of intermediate-mass black holes in dense stellar environments is not well understood (“Survival Analysis of Intermediate-mass Black Holes in Dense Star Clusters”, 2026); (3) If the eclipse is powered by a WD wind, the system is likely observed in a short-lived phase; alternatively, if the companion is an older WD, the origin of the eclipsing material remains unclear (“Deep Adaptive Optics Imaging Rules Out a Helium Star Companion to PSR J1928+1815”, 2026); (4) The thermal evolution of neo-NSs with temperature-dependent crusts is not well understood (“Thermal evolution of neo-neutron stars. II. Temperature-dependent crusts”, 2026); (5) Whether nature follows this description remains an open question, but the framework provides a consistent and testable foundation for further investigation (“Simple Gravity: A Scalar Refractive Framework for Gravitational Phenomena”, 2026). 411 gap statements have been mined from Pulsars and Gravitational Waves Research papers in our 7.9M-paper local library, which holds 2,333 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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