4035 papers
Quantum gravity represents the frontier where the very large meets the very small, attempting to unify Einstein's theory of gravity with the strange rules of quantum mechanics. This field explores the fundamental fabric of spacetime, seeking to understand how the universe behaves at its most extreme scales, from the heart of black holes to the moment of the Big Bang. Because these concepts often involve complex mathematics, they can feel distant to non-specialists, yet they hold the key to a complete picture of physical reality.
At Gist.Science, we bridge this gap by processing every new preprint in this category directly from arXiv. Our team provides both plain-language explanations and detailed technical summaries for each paper, ensuring that groundbreaking research is accessible to everyone, from curious students to seasoned researchers. Below are the latest papers in quantum gravity, offering fresh insights into the nature of our cosmos.
This paper revisits energy-momentum squared gravity by incorporating second derivatives of the matter Lagrangian and thermodynamic relations, demonstrating that the resulting scalar-tensor theory supports linear stability and successfully describes the Universe's evolution from matter domination to late-time accelerated expansion.
The paper proposes a conjecture that the final state of a binary black hole merger is determined by a thermodynamic principle of entropy maximization, as the entropy of a hypothetical Kerr black hole mapped from the binary's mass and angular momentum peaks at values strikingly close to the numerical relativity-predicted remnant.
This paper investigates the dynamics of a probe massless particle near the horizon of a dyonic AdS-Reissner-Nordström black hole under a harmonic potential, revealing that the extremal black hole limit exhibits a counteracting regulatory role where it enhances chaos at low energies (violating the Lyapunov bound) but suppresses it at high energies, thereby establishing a direct mapping between black hole thermodynamics and microscopic chaos.
This paper explores traversable wormhole solutions in gravity supported by Rényi, Moradpour, and Bekenstein–Hawking holographic dark energy models, demonstrating that while the resulting shape functions satisfy geometric traversability criteria, the null energy condition is inevitably violated, necessitating exotic matter or an effective exotic sector.
This paper employs the Schwinger-Keldysh formalism to derive and renormalize the one-loop effective action for a scalar field in de Sitter spacetime, demonstrating that nonlocal quantum corrections introduce memory and noise terms that suppress the field's infrared variance compared to tree-level predictions.
Motivated by Maldacena's observer-centric formulation, this paper develops a relational state-counting framework in Euclidean de Sitter space where an observer modeled as a massive worldline with an SU(3) clock cancels negative gravitational modes and, via a Hamiltonian constraint, yields a real and positive microcanonical density that links the cosmological constant and fundamental constants to SU(3) confinement.
This paper introduces a new causal spinfoam vertex for 4d Lorentzian quantum gravity that utilizes Toller matrices to encode causal data, demonstrating that in the large-spin limit, this formulation selects only Lorentzian Regge geometries with compatible causal structures, yielding a single Regge action exponential and establishing a new form of causal rigidity.
This paper utilizes the worldline formalism to present a unified one-loop calculation of photon-graviton mixing in an electromagnetic field, identifying a previously overlooked tadpole diagram that contributes to the amplitude but does not affect magnetic dichroism, while also extending the analysis to include scalar loops and electric field components.
This paper demonstrates that Affleck-Dine baryogenesis can be realized with low-energy, non-supersymmetric physics involving a light scalar field, which produces detectable gravitational waves in the LIGO frequency range, thereby establishing a new complementarity between gravitational wave astronomy and particle physics experiments.
Through fully general-relativistic hydrodynamics simulations of binary neutron star mergers, this study finds that post-merger massive neutron stars are convectively stable due to outward increases in entropy and angular momentum enhanced by rotation, exhibit no observable inertial modes, and display an one-armed mode whose growth may be numerically induced by linear momentum conservation violations.