hep-th

Krylov Subspace Dynamics as Near-Horizon AdS$_2$ Holography

This paper establishes a holographic duality between Krylov subspace dynamics and near-horizon AdS$_2$ gravity, demonstrating that the continuum limit of operator growth maps to a scalar field obeying the Klein-Gordon equation, where the linear growth of Lanczos coefficients corresponds to Hawking temperature and the Breitenlohner-Freedman bound ensures stability.

dS$^4$ Metamorphosis

This paper derives a gluing formula for the Euclidean path integral of higher spin gravity on $S^4$ by expressing it in terms of a boundary theory on a splitting $S^3$ hypersurface, identifying this boundary theory as the $\mathrm{Sp}(N)$ invariant sector of free scalars for even-spin spectra and an $\mathcal{N}=2$ superconformal theory for mixed bosonic-fermionic spectra.

Beyond Mean Field: Fluctuation Diagnostics and Fixed-Point Behavior

This paper develops theoretical diagnostics for the breakdown of mean-field theory, demonstrating how spatial structure and finite interaction ranges qualitatively alter the effective description and renormalization-group flow.

Classically Forbidden Signatures of Quantum Coherence in the Mesoscopic Lipkin-Meshkov-Glick Model

This paper establishes strict quantitative conditions and demonstrates via simulation that a mesoscopic spinor Bose-Einstein condensate of approximately 370 spins near the Lipkin-Meshkov-Glick critical point can exhibit classically forbidden temporal correlations, specifically through an exponentially suppressed Landau-Zener error rate and a Leggett-Garg inequality violation (K_3 ~ 1.32), both robust against realistic dephasing due to emergent collective symmetry and dynamical phase alignment.

Hawking area law in quantum gravity

This paper demonstrates that the LIGO–Virgo–KAGRA verification of the Hawking area law imposes stringent constraints on local Stelle and nonlocal quantum gravity theories, effectively narrowing their ambiguities by requiring specific conditions on their action and propagators while simultaneously establishing the classical entropy-area law and realizing Barrow's fractal black holes.

Tree Amplitudes with Charged Matter in Pure Gauge Theory

This paper introduces `fermionic_amplitudes.m`, a Mathematica package that computes tree-level scattering amplitudes for arbitrary numbers of gauge bosons and massless fermions in pure non-supersymmetric gauge theories by expressing distinct-flavour amplitudes as linear combinations of single-flavour components derived from supersymmetric Yang-Mills theory, while providing explicit numeric colour tensors for cross-section calculations.

Neural Networks Reveal a Universal Bias in Conformal Correlators

This paper proposes that simple neural networks trained on crossing symmetry can accurately reconstruct conformal correlators using minimal inputs, a success attributed to the alignment between the spectral bias of gradient-based training and the intrinsic smoothness of conformal field theory, thereby suggesting a novel variational principle for non-perturbative quantum field theory.

All-order fluctuating hydrodynamics of the SYK lattice

This paper derives the all-order fluctuating hydrodynamics of the SYK lattice from its microscopic nonlinear action, explicitly embedding hydrodynamic degrees of freedom into the model and determining all corresponding transport coefficients to demonstrate how hydrodynamics emerges from a strongly coupled quantum many-body system.

The perturbative Ricci flow in gravity

Mapping Tachyon effective field theory to a subsector of Klein-Gordon theory

This paper establishes a quantum equivalence between the effective field theory of a rolling tachyon on an unstable D-brane and a specific subsector of Klein-Gordon theory, demonstrating that the late-time physics of the tachyon vacuum corresponds to a coherent state of non-interacting dust particles.