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Open research questions in Astrophysics and Cosmic Phenomena

108 unresolved questions extracted from the limitations and future-work sections of 271 Astrophysics and Cosmic Phenomena papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The deflection of UHECRs by Galactic and extragalactic magnetic fields, making it challenging to trace them back to their sources. The limited statistics and unclear composition of UHECRs, due to uncertainties in interpreting measurements of the depth of the air-shower maximum. The need to combine UHECR data with multi-messenger signals to understand the sources of UHECRs.

    Implications of a Cosmogenic Origin of KM3-230213A for Ultra-high-energy Protons · 2026 · DOI

  • The complexity of simulating turbulence and particle acceleration in supersonic plasmas. The need for a detailed understanding of the effects of turbulence on particle acceleration. The challenge of extending the simulations to 3 dimensions and including the effects of large-scale structure and relativistic velocities.

    Efficient Particle Acceleration in 2.5-dimensional Hybrid-kinetic Simulations of Decaying Supersonic Plasma Turbulence · 2026 · DOI

  • The analysis is challenging due to the need to correct for atmospheric effects. The paper must address the limitation of not accumulating 18^2 = 324 histograms for every possible combination of counters.

    Measuring Contributions from Single and Multiple Atmospheric Secondary Cosmic Rays in the Princess Sirindhorn Neutron Monitor Using Cross-counter Neutron Time Delay Distributions · 2026 · DOI

  • The complexity of simulating CTAO observations - The need to constrain the ALP parameter space

    Projected sensitivity of CTAO to axion-like particles from blazars with a machine learning approach · 2026 · DOI

  • The case of Cygnus is challenging due to the need for extreme assumptions to accommodate the LHAASO data. The paper must consider the inhomogeneity of the diffusion coefficient. The results must be compared to data from multiple gamma-ray telescopes.

    Suppressed diffusion and gamma-ray emission from the Cygnus bubble · 2026 · DOI

  • The challenge of explaining the IceCube 5 TeV-10 PeV spectral feature using a fundamental physical mechanism. The challenge of providing a log-parabolic account from a generation comb, with the source index and the flux normalization remaining astrophysical inputs taken from the data. The challenge of understanding the implications of the framework's transverse-relaxation constant σ T2* = 1/8 for neutrino telescope design.

    Paper CCLXXII: The IceCube 5 TeV-10 PeV Spectral Feature as W-Threshold Bulk Transit — A Log-Parabolic Account from a Generation Comb and the sigma_T2* = 1/8 Curvature · 2026 · DOI

  • The detection of gamma-ray emission from the Galactic center is challenging due to the complex structure of the emission. The camera's performance and sensitivity need to be well understood. The results need to be validated through independent measurements.

    Observation of the Galactic Center in the sub-MeV gamma-ray band with an electron-tracking Compton camera · 2026 · DOI

  • The complexity of the blazar emission process. The lack of a unified framework connecting observables to the underlying jet physics. The need for more sophisticated models of blazar emission.

    Different Jet Dissipation Mechanisms Underlying the Variability in Blazars · 2026 · DOI

  • The detection sensitivity of Fermi-LAT may not be sufficient to detect GeV emission from CSOs. The sample size of CSOs may be limited.

    Searching for <i>γ</i> -Ray Emission from a Bona Fide Compact Symmetric Object Sample: A <i>γ</i> -Ray Signal near GB6 J0906+4124 · 2026 · DOI

  • The detection of gamma-ray emission from CSOs is not well understood. The origin of the gamma-ray signal near GB6 J0906+4124 is unknown.

    Searching for <i>γ</i> -Ray Emission from a Bona Fide Compact Symmetric Object Sample: A <i>γ</i> -Ray Signal near GB6 J0906+4124 · 2026 · DOI

  • A key limitation of this method is that it requires knowledge of the relativistic Doppler factor.

    A refined method for measuring cosmological distances using variability and proper motions in AGN with VLBI-detected counter-jets · 2026

  • Abstract Fast radio bursts (FRBs) and gamma-ray bursts (GRBs) are both linked to compact-object activity, yet their possible connection remains unclear.

    Searching for Gamma-Ray Bursts Associated with the Second CHIME/FRB Catalog · 2026 · DOI

  • The HOx-driven ozone perturbation at 17.5 km is estimated as a local effect, but full transport modeling is needed to determine if and how meridional circulation affects the latitude-dependent forcing.

    Energy deposition by galactic cosmic rays and implications for ozone chemistry · 2026 · DOI

  • The physical parameters of the jet plasma (magnetic field strength, particle energy distribution, Lorentz factor) during the PKS 0446+11 multimessenger flare remain poorly constrained due to lack of polarimetric monitoring data across multiple epochs. Continuous polarization measurements are needed to probe jet magnetization and particle acceleration efficiency.

    Multimessenger flare in the quasar PKS 0446+11 · 2026 · DOI

  • The relationship between rapid radio variability (on hourly timescales) and neutrino event clustering in PKS 0446+11 has not been systematically quantified. Future studies should apply wavelet cross-correlation analysis between radio light curves and neutrino arrival times to establish causal connections in blazar flare mechanisms.

    Multimessenger flare in the quasar PKS 0446+11 · 2026 · DOI

  • The memory burden effect severely limits the detectability of individual PBH bursts at neutrino observatories. The analysis is limited to a single-source estimate and does not capture the cumulative contribution from a Galactic population of PBHs. The inclusion of HNLs enhances the overall neutrino fluence, but the effect is not well understood.

    Neutrino fluence influenced by memory burdened primordial black holes · 2026 · DOI

  • The authors assume a monochromatic PBH mass function. They consider only two benchmark distances for the PBH location. The analysis is limited to a single-source estimate and does not capture the cumulative contribution from a Galactic population of PBHs.

    Neutrino fluence influenced by memory burdened primordial black holes · 2026 · DOI

  • Future research could explore the implications of the Big Rip cosmological scenario in more detail. The study's findings could inform future research on dark energy and its role in shaping the ultimate fate of the cosmos.

    Analyzing Phantom Energy Ascribable to the Ultimate Fate of the Cosmos in Connection to Big Rip Cosmology in Relativistic Cosmology · 2026 · DOI

  • The gap is the lack of understanding of phantom energy and its implications. The study aims to address this gap by exploring the concept of phantom energy and its effects on cosmic expansion.

    Analyzing Phantom Energy Ascribable to the Ultimate Fate of the Cosmos in Connection to Big Rip Cosmology in Relativistic Cosmology · 2026 · DOI

  • Further studies are needed to understand the associations between TeV gamma-ray sources and various objects. The RAOC method can be applied to other studies of associations between different kinds of objects.

    A Comparative Study of TeV Gamma-Ray Sources with Various Objects · 2026 · DOI

  • The origin of Galactic cosmic rays remains one of the most fundamental problems in astrophysics. The associations between TeV gamma-ray sources and various objects are not well understood.

    A Comparative Study of TeV Gamma-Ray Sources with Various Objects · 2026 · DOI

  • The calculation is a simplified argument showing that galactic fields alone cannot explain the observed void fields. Other mechanisms, such as instabilities and outflows, may play an important role and further complicate the picture.

    The contribution of galaxies to the magnetic field in cosmic voids · 2026 · DOI

  • The paper identifies a gap in understanding the origin of the diffuse neutrino flux observed by IceCube. The gap is addressed by investigating whether the diffuse neutrino flux can originate, via proton acceleration, in reconnection-powered coronae of non-jetted AGNs.

    Diffuse neutrino flux from relativistic reconnection in AGN coronae · 2026 · DOI

  • Future studies should investigate the implications of a cosmogenic origin of the KM3-230213A neutrino event for other UHECR models. Future studies should explore the potential of combining UHECR data with multi-messenger signals to understand the sources of UHECRs. Future studies should investigate the effects of source-to-source variations on the cosmological evolution of UHECR sources.

    Implications of a Cosmogenic Origin of KM3-230213A for Ultra-high-energy Protons · 2026 · DOI

  • The simulations are limited to 2.5 dimensions. The ion population is assumed to be cold (βi ≃ 1/16) at the initial time. The simulations do not include the effects of large-scale structure or relativistic velocities.

    Efficient Particle Acceleration in 2.5-dimensional Hybrid-kinetic Simulations of Decaying Supersonic Plasma Turbulence · 2026 · DOI

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108 open questions have been extracted from the limitations and future-work passages of 271 Astrophysics and Cosmic Phenomena papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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