hep-th

Symmetries of massless QCD

This paper provides a pedagogical review of exact theoretical results regarding the symmetries of massless Quantum Chromodynamics (QCD) in an idealized scenario where quarks are devoid of mass.

Mixed-helicity bracket of celestial symmetries

The Hidden Symmetries of Yang-Mills Theory in (1+1)-dimensions

This paper establishes an integral formulation of classical Yang-Mills theory in (1+1) dimensions coupled to matter, demonstrating that path-independent holonomy eigenvalues generate an infinite hierarchy of gauge-invariant conserved charges that form a Poisson algebra in involution and define global symmetries preserving the system's dynamics.

Hilbert Space Fragmentation from Generalized Symmetries

This paper demonstrates that generalized symmetries, including higher-form, subsystem, gauge, and non-invertible symmetries, can induce exponential Hilbert space fragmentation, thereby challenging the assumption that such fragmentation necessarily implies ergodicity breaking and revealing its role in disorder-free localization.

Infrared Spectral Gap in a Gluonic Dark Sector as the Origin of the Galactic Acceleration Scale

This paper proposes that the universal galactic acceleration scale arises from a trace-anomaly-induced infrared spectral gap in a coherent, color-neutral gluonic dark sector governed by Anti de Sitter symmetry, which generates a characteristic acceleration scale within standard Newtonian gravity without requiring modified gravity or specific formation histories.

State counting in gravity and maximal entropy principle

This paper demonstrates that the state-counting interpretation of black hole entropy and the unitary Page curve for Hawking radiation are equivalent within the gravity path integral framework, showing that the information loss paradox is resolved by any microstate basis compatible with black hole entropy via a convex optimization problem for von Neumann entropy.

Cosmologically viable non-polynomial quasi-topological gravity: explicit models, $\Lambda$CDM limit and observational constraints

This paper proposes and validates non-polynomial quasi-topological gravity as a theoretically consistent, higher-curvature extension of general relativity that successfully reproduces the standard thermal history of the universe and provides a dynamical dark energy explanation for late-time cosmic acceleration, remaining fully compatible with current observational data and statistically competitive with the $\Lambda$CDM model.

Probing Scalar-Tensor-Induced Gravitational Waves in the nHz Band: $\texttt{NANOGrav}$ and SKA

This paper computes the energy density of scalar-tensor-induced gravitational waves (STGWs) generated during early matter-dominated and radiation-dominated eras, demonstrating that while these signals dilute in a purely matter-dominated universe, they remain viable and potentially dominant contributors to the nanohertz stochastic gravitational wave background observed by NANOGrav and detectable by the future Square Kilometre Array.

General equilibrium second-order hydrodynamic coefficients for free quantum fields

This paper presents a systematic calculation of non-dissipative, quantum-origin second-order hydrodynamic corrections to the stress-energy tensor and currents for free boson and Dirac fields in thermal vorticity, deriving their Kubo formulae via equilibrium correlators and demonstrating that the axial current receives vorticity-proportional corrections independent of anomalous terms.

A scaling limit of $\mathrm{SU}(2)$ lattice Yang-Mills-Higgs theory

This paper constructs the first scaling limit of a non-Abelian lattice Yang-Mills theory in dimensions higher than two by demonstrating that, under specific gauge fixing and coupling limits, the $\mathrm{SU}(2)$ Yang-Mills-Higgs model converges to a massive Gaussian field, thereby providing the first rigorous proof of mass generation via the Higgs mechanism in such a setting.