Modified Gravity Effects on Neutron Star Structure
Summary
Neutron stars are laboratories for extreme gravity, dense matter and strong magnetic fields. Modified theories of gravity extend Einstein’s general relativity by introducing new functions of spacetime curvature or related scalars. Such alterations can shift the balance between pressure and gravity inside a star and thus change its predicted structure. In one class known as f(R) gravity, the equations governing pressure and density include extra curvature terms that can raise the maximum stable mass of neutron stars. Alternative models add dependencies on the Gauss–Bonnet invariant (f(G) gravity) or on the non-metricity scalar (f(Q) gravity), each producing subtle deviations in density distributions, pressure anisotropy and surface redshift. These frameworks can avoid singularities at the core, accommodate heavier stars above two solar masses and modify observable properties such as the mass–radius relation and gravitational-wave signatures. By comparing theoretical predictions with observations of pulsars and compact binary mergers, researchers aim to test the validity and parameter space of these extended theories, ultimately refining our understanding of gravity in its most extreme regime.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Modified Gravity Effects on Neutron Star Structure publication trend
The graph below shows the total number of articles in modified gravity effects on neutron star structure across all publications each year (not limited to Nature Index journals).
Technical terms
General relativity: The standard theory of gravity describing spacetime curvature due to mass and energy.
Modified gravity: Theories extending general relativity by adding functions of curvature invariants or other scalars.
Ricci scalar (R): A measure of spacetime curvature obtained by contracting the Ricci tensor.
Gauss–Bonnet invariant (G): A quadratic curvature term combining Ricci and Riemann tensors, relevant in certain higher-order theories.
Non-metricity scalar (Q): A geometrical quantity arising in theories where the connection is not metric compatible.
Equation of state (EoS): A relation between pressure and density of matter inside a star.
Anisotropy: Difference between radial and tangential pressure components in stellar interiors.
Tolman–Oppenheimer–Volkoff equation: The general relativistic equation of hydrostatic equilibrium for spherically symmetric bodies.
References
- Physical characteristics and maximum allowable mass of hybrid star in the context of f(Q) gravity. European Physical Journal C (2023).
- Causal limit of neutron star maximum mass in f(R) gravity in view of GW190814. Physics Letters B (2021).
- Anisotropic quark stars in R 2 gravity. Physics Letters B (2021).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.