3967 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 investigates two non-singular cyclic universe models driven by a negative, time-varying cosmological constant, demonstrating that they can achieve physically acceptable positive energy density evolution and specific dynamical features like pressure sign flipping or phantom divide crossing without violating the null energy condition.
This paper analyzes various dynamical dark energy models against the latest cosmological observations (excluding SH0ES and structure formation data) and finds that the "flipped RVM," along with the XCDM and threshold RVM models, provides significant evidence for dynamical dark energy comparable to the CDM parameterization, particularly when using DES-Y5 data.
This paper presents a fully analytical model of relativistic jet launching from a Kerr black hole's magnetosphere by utilizing the integrability of electrogeodesic motion to derive criteria for stable particle ejection, magnetic frame-dragging effects, and asymptotic blueshift conditions.
This paper investigates holographic timelike entanglement entropy and subregion complexity in scalar-deformed thermal CFTs dual to hairy black holes, demonstrating that the scalar deformation breaks the imaginary component invariance of HTEE observed in pure AdS, reveals the failure of analytic continuation to reproduce these results, and establishes that timelike subregion complexity remains real-valued with its UV-finite term in BTZ geometry arising entirely from the black hole interior.
This paper unifies three major categories of mathematical results on quiescent big bang singularities by demonstrating that solutions satisfying recent general conditions for big bang formation indeed induce well-defined initial data on the singularity, thereby bridging the gap between stable formation proofs and geometric data construction.
This paper proposes a Generalized Cosmological Time framework that resolves conflicting time dilation observations by distinguishing between discrete, gravitationally shielded transients (SNe Ia and GRBs) that exhibit geometric path dilation and persistent thermal sources (QSOs) whose signals are masked by intrinsic selection effects.
This paper presents global 3D GRMHD simulations incorporating pair physics to reveal that electron-positron pairs in black hole accretion flows are primarily generated near the disk midplane and transported via advection to the corona and jets, where they can significantly exceed equilibrium values and potentially regulate coronal temperatures.
This paper analytically proves the black-hole Meissner effect for extremal Kerr--Bertotti--Robinson spacetimes by demonstrating that horizon-threading magnetic flux vanishes in the static limit through exact identities derived from the horizon's double-root structure, a result corroborated by geometric arguments and contrasted with other spacetime families.
This paper establishes novel decoupled energy estimates for tensorial non-linear wave equations by exploiting their specific structure and commutator terms, providing a framework to handle non-linearities from the Einstein-Yang-Mills system and other new structures that are incompatible with the classical Lindblad-Rodnianski -estimate.
This paper proposes a single-field inflation model where the inflaton is the dilaton of a confining gauge theory, deriving a Coleman--Weinberg potential constrained by the trace anomaly that, when coupled non-minimally to gravity, yields a plateau consistent with CMB data while predicting specific, testable deviations in spectral indices driven by the Migdal--Shifman logarithmic structure.