Science AI Journal
Physics and Astronomy · Research topic

Open research questions in Cosmology and Gravitation Theories

616 unresolved questions extracted from the limitations and future-work sections of 1,138 Cosmology and Gravitation Theories papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Further investigation of the TDE scenario is needed, - Exploration of the cosmological evolution of the instanton density, - Examination of the TDE scenario in the context of other gravitational theories

    Topological dark energy from spacetime foam: A challenge for ΛCDM · 2026 · DOI

  • Theoretical and observational issues of the standard ΛCDM paradigm. Lack of a microphysical mechanism for Dark Energy. Need for alternative theories and scenarios beyond ΛCDM.

    Topological dark energy from spacetime foam: A challenge for ΛCDM · 2026 · DOI

  • Further study of the behavior of one-loop GWs in different inflationary models - Investigation of the implications of symmetry-protected infrared conservation for cosmological observations

    One-loop corrections to infrared GWs is forbidden by symmetries · 2026 · DOI

  • The existence of one-loop corrections to tensor perturbations on large scales is a long-standing controversy. Prior calculations yielded conflicting results, with some suggesting large loop corrections on large scales. The gap lies in resolving this controversy and understanding the behavior of one-loop GWs induced by inflaton perturbations.

    One-loop corrections to infrared GWs is forbidden by symmetries · 2026 · DOI

  • Investigating the effects of higher-order corrections to the power spectrum, - Exploring the implications of the model for PBH formation and SIGWs, - Studying the non-Gaussianity of curvature perturbations in more detail

    Rescattering of non-minimal coupling scalar particles during inflation · 2026 · DOI

  • The paper identifies a gap in the understanding of rescattering effects of non-minimally coupled scalar particles during inflation. The study aims to resolve the effects of rescattering on the power spectrum and non-Gaussianity of curvature perturbations.

    Rescattering of non-minimal coupling scalar particles during inflation · 2026 · DOI

  • The paper identifies a gap in the understanding of the computation procedure of the expansion history of cosmological models. The degeneracy in the computation procedure may lead to incorrect interpretations of cosmological data. The study aims to address this gap by discussing the implications of the degeneracy and its effects on the analysis of dark energy models.

    Why cosmological data analysis of dark energy may inadvertently favor phantom energy models · 2026 · DOI

  • Further examination of the expansion history - Investigation of the effects of torsion on other cosmological models - Analysis of the implications of the adiabatic torsion mode on the universe's evolution

    No late-time role for adiabatic torsion: a no-go result for Hubble-cutoff holographic dark energy in Einstein–Cartan cosmology · 2026 · DOI

  • The gap is that previous work has not properly analyzed the role of torsion in the expansion history. The gap is that the claim of torsion rescuing the Hubble radius has not been rigorously tested. The paper identifies the need for a more detailed analysis of the torsion mode in Einstein-Cartan cosmology.

    No late-time role for adiabatic torsion: a no-go result for Hubble-cutoff holographic dark energy in Einstein–Cartan cosmology · 2026 · DOI

  • extending SBF measurements to cosmological distances using the WFC/IR camera of Hubble Space Telescope (HST) and the NIRCam on the James Webb Space Telescope (JWST), - using SBF to settle the question of whether the CMB dipole arises from the gravitational influence of large-scale structure within or beyond ∼100 Mpc of the Local Group

    Return to the Great Attractor: Strong Evidence for a Steradian-sized Flow Converging at ∼70 Mpc within the GA Supercluster and Aligned with the CMB Dipole · 2026 · DOI

  • The question of what causes the CMB dipole anisotropy remains open. Previous studies have suggested that the Great Attractor could be responsible for the CMB dipole, but the results were inconclusive. There is a need for accurate distance measurements to derive peculiar velocities and test the GA model.

    Return to the Great Attractor: Strong Evidence for a Steradian-sized Flow Converging at ∼70 Mpc within the GA Supercluster and Aligned with the CMB Dipole · 2026 · DOI

  • Training that treats Gravitational Waves and the New Astronomy as a settled body of findings misrepresents its condi- tion; training that treats it as all open questions fails to convey what has been secured.

    Hearing the Universe for the First Time: A Historical Development Review of Gravitational Waves and the New Astronomy · 2026 · DOI

  • Investigate the cause of the degeneracy in the computation procedure, - Explore alternative methods to analyze cosmological data

    Why cosmological data analysis of dark energy may inadvertently favor phantom energy models · 2026 · DOI

  • Yet, our understanding of non-linearities is still insufficient to reach important theoretical benchmarks for equilateral PNG, while, for local PNG, our forecast is more optimistic.

    Lifting primordial non-Gaussianity above the noise · 2026 · DOI

  • The resulting framework provides a reproducible mathematical basis for further investigation of the emergence of three-dimensional gravitational behaviour from structured microscopic lattices.

    First-Principles Derivation of Emergent Newtonian Gravity in HCP Optical Lattices: Isotropy Spectrum, Geometric Crossover, and Coupling Structure · 2026 · DOI

  • To fully harness the capabilities of these surveys, it is critical to constrain the poorly understood influence of baryon feedback physics on the matter power spectrum.

    Constraining Baryonic Feedback Effects on the Matter Power Spectrum with Fast Radio Bursts · 2025 · DOI

  • Abstract Fast radio bursts (FRBs) are highly energetic events of short-duration intense radio emission, the origin of which remains elusive.

    Unusual Intraburst Variations of Polarization States in FRB 20210912A and FRB 20230708A: Effects of Plasma Birefringence? · 2025 · DOI

  • Although the cosmographical approach has been highly successful in several geometric theories in recent years, it has not been extensively explored in coupled gravities.

    Constraining Extended Teleparallel Gravity via Cosmography: A Model-independent Approach · 2024 · DOI

  • It remains to be seen if the new model is consistent with the CMB power spectrum, the Big Bang nucleosynthesis of light elements, and other critical observations.

    Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features · 2024 · DOI

  • 01–2 pc for a Milky Way–like galaxy); (b) an increased EMRI-to-plunge ratio, favoring EMRIs at galaxies where stellar-mass black holes are scarce; (c) a detection of about 2 × 103 resolvable EMRIs, with a signal-to-noise ratio above 20, along a 4 yr LISA mission time; and (d) a confusion noise, induced by a cosmological population of unresolved EMRIs, reducing the LISA sensitivity in the 1–5 mHz frequency range by up to a factor of ≈2, relative to the instrumental noise.

    Dynamics Around Supermassive Black Holes: Extreme-mass-ratio Inspirals as Gravitational-wave Sources · 2024 · DOI

  • Abstract The connection between the binary black hole (BBH) mergers observed by LIGO-Virgo-KAGRA and their stellar progenitors remains uncertain.

    The Mass Density of Merging Binary Black Holes over Cosmic Time · 2024 · DOI

  • The underlying cause of the late-time cosmic acceleration remains one of the most profound mysteries in modern physics. The properties of dark energy are not well understood

    Investigating Barrow Holographic Dark Energy in Quintessential f(R,Lm)-Gravity with Ricci Scalar as the IR Cutoff · 2026 · DOI

  • Further development of the Theory of Infinite Universe and Quantum Vacuum. Experimental verification of the predicted phenomena. Application of the model to other areas of cosmology and physics.

    Theory of Infinite Universe and Quantum Vacuum: From Galactic Rotation to Cosmic Redshift · 2026 · DOI

  • The lack of a unified theoretical framework explaining cosmological observations. The need for an alternative to the Doppler-based expansion model. The requirement for Dark Energy or space expansion in current cosmological models.

    Theory of Infinite Universe and Quantum Vacuum: From Galactic Rotation to Cosmic Redshift · 2026 · DOI

  • The ultimate fate of the universe remains one of the central questions in cosmology. The Big Rip scenario is a phenomenological model that relies on the assumption of a dark energy component.

    Woven Theory-Big Rip vs Woven Threads: A First-Principles Prediction of Cosmic Lifetime · 2026 · DOI

Most-cited papers in Cosmology and Gravitation Theories

Most recent work

Find a gap in your own Cosmology and Gravitation Theories sub-topic

This page shows what the Cosmology and Gravitation Theories literature already flags as unresolved. To narrow it to your specific question, run the guided finder — it searches the gap library on demand and checks candidates against 250M+ OpenAlex works.

Open the Research Gap Finder →

Related topics in Physics and Astronomy

Galaxies: Formation, Evolution, Phenomena
564 open questions
Stellar, planetary, and galactic studies
450 open questions
Model Reduction and Neural Networks
408 open questions
Black Holes and Theoretical Physics
341 open questions
Quantum Mechanics and Applications
318 open questions
Ionosphere and magnetosphere dynamics
314 open questions
Pulsars and Gravitational Waves Research
288 open questions
Quantum many-body systems
279 open questions
616 open questions have been extracted from the limitations and future-work passages of 1,138 Cosmology and Gravitation Theories papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

Tools for your next paper

Gaps & Literature SearchFind open questions in any field — 120,000+ open gaps mined from our own library.Pre-CheckIs your paper ready? A Tier 1–5 acceptance probability in seconds.Journal FinderA ranked shortlist of target journals from a 17,500-venue index.Duplicate Publication CheckerCheck prior-publication & salami-slicing risk across 8 sources.Citation GeneratorFreeA DOI or title → APA, MLA, Vancouver, Chicago, BibTeX, RIS. No signup.Graphical Abstract MakerFreeTurn your findings into a colorblind-safe graphical abstract.

Compare the category — Honest roundups of the AI research tools, ours listed alongside the alternatives.

Command palette

Jump anywhere, run any action.