Physics Research
Resonances Drive Information Scrambling in Non-KAM Quantum Systems
This work investigates operator growth in quantized non-Kolmogorov-Arnold-Moser (non-KAM) systems, specifically the kicked harmonic oscillator, using out-of-time-ordered correlators (OTOCs). The study reveals that even without traditional chaos, resonances (where frequency ratios are integers) cause…
Quantifying Order Unity Couplings and Their Ratios in Quantum Field Theories
This paper introduces a measure, the 'spread,' to quantify the adherence of quantum field theories to the expectation that dimensionless couplings are order unity. It demonstrates that even with assumptions of independent, identically distributed couplings, the ratios of these couplings can exhibit …
BESIII reports high-precision measurement of $D_s^+ \to \tau^+ \nu_{\tau}$ branching fraction, constraining $|V_{cs}|$ and confirming lepton universality
This study reports an updated, high-precision measurement of the branching fraction for $D_s^+ \to \tau^+ \nu_{\tau}$, utilizing a dataset of 7.33 fb$^{-1}$ collected by the BESIII detector. The measurement yields $\mathcal{B}({D_s^+ \to \tau^+ \nu_{\tau}}) = (5.37 \pm 0.08_{\rm stat} \pm 0.06_{\rm …
Proximity to Coherent States, Not Occupation Number, Determines Classical Behavior in Bosonic Systems
This work investigates the applicability of classical field descriptions for systems with a large number of identical bosons. The study challenges the common assumption that a high mean occupation number in a single-particle state guarantees classical behavior. Using the criterion $2 \sigma_\varphi …
Quantum Reaction Dynamics Achieves Recrossing-Free Dividing Surface, Defying Decades-Old Uncertainty Principle Objection
This paper disproves a near-century-old assumption that a recrossing-free dividing surface—a cornerstone of classical reaction rate theory—is impossible in quantum mechanics due to the uncertainty principle. The author shows that the exact quantum flow (not just semiclassical approximations) admits …
Disorder as a Superconductivity Enabler: Mott-State Fragility Drives Bulk SC in 4Hb-TaS₂
In 4Hb-TaS₂, a natural heterostructure of interleaved Mott-like (1T) and metallic layers, bulk superconductivity is not an intrinsic clean-limit property but is instead triggered by quenched disorder via Se/S substitution. Disorder delocalizes carriers in the Mott-like layer, nucleating a new Fermi …
Fabrication-Free Third-Order Exceptional Points via Brillouin Optoacoustics in Standard Optical Fiber
This work demonstrates an experimental realization of a third-order exceptional point (EP3) in a single-mode optical fiber using synthetic dimensions created through multi-frequency Brillouin scattering — bypassing the need for precisely fabricated nano- or microstructures. By scanning a multi-dimen…
Field-Induced Hidden Order in Nd₂Be₂GeO₇ Points to a Ground State Poised Between Quantum Spin Liquid and Long-Range Magnetic Order
Nd₂Be₂GeO₇, a frustrated Shastry-Sutherland magnet, exhibits a thermodynamic phase transition at 250 mK with no detectable static magnetism in zero field — a hallmark of hidden order. Uniquely, this hidden order is not suppressed by an applied magnetic field but is instead revealed only after field …
Twin Phases: A New Class of Phase Transitions That Permanently Escape Landau's Symmetry-Breaking Paradigm
Warman, Gai, and Schafer-Nameki introduce "twin phases" — inequivalent quantum phases whose order parameters belong to the same generalized charge under a shared symmetry S — and prove that direct transitions between them cannot be classified as spontaneous symmetry breaking (SSB), even after partia…
Hamilton-Ostrogradski Formalism Applied to the Pais-Uhlenbeck Oscillator: A Pedagogical Bridge to Higher-Order Classical Mechanics
The Hamilton-Ostrogradski formalism — an extension of Hamiltonian mechanics to Lagrangians with higher-order derivatives — remains largely absent from textbooks despite its foundational role in higher-order dynamics and connections to modern theoretical physics. This paper introduces the formalism t…
Positive Effective Range as a Rigorous Signature of Molecular Structure in Exotic Hadrons
A new theoretical result rigorously proves that for finite-range potentials with a repulsive core and attractive outer tail — the canonical shape for hadronic interactions — the effective range r₀ is strictly positive when the scattering length exceeds the potential range (a > R). This provides form…
Regularized Optimization Recovers KE Spectra from Ocean Structure Functions
A regularized fitting approach inverts the ill-posed relationship between second-order velocity structure functions and kinetic energy (KE) wavenumber spectra by parameterizing spectra as piecewise segments with distinct slopes and amplitudes, solved via optimization. Validated on synthetic spectra …
Viscous-to-Inertial Shear Thickening Exhibits Critical Slowdown Near Jamming in Frictionless Suspensions
DEM simulations reveal that the characteristic shear rate for the viscous-to-inertial shear thickening transition in dense frictionless non-Brownian suspensions vanishes as the jamming volume fraction φ_m is approached. This criticality arises from a diverging microstructural length scale that gover…
Holographic Stirling Engines Achieve Carnot Efficiency via Isochoric Heat Matching and Regeneration
The paper computes Stirling engine efficiencies for diverse working substances, including Van der Waals fluids, quantum gases, CFTs, and holographic CFTs dual to AdS black holes. Regeneration enhances efficiency by recycling internal heat, with deviation from Carnot bound governed by isochoric heat …
Quantum Geometric Tensor Unifies Polarization Metric and Topological Berry Curvature in Rotating Shallow Water Waves
The paper computes the full quantum geometric tensor (QGT) for the linearized rotating shallow water equations on an f-plane, revealing its real part as a metric for wave polarization changes and imaginary part as Berry curvature governing topological invariants. Compact symmetry-guided expressions …
Efficient Two-Fluid Numerical Framework Simulates Bacterial Flagellar Swimming in Elasto-Viscoplastic Biofluids
A two-fluid model simulates flagellated bacterial locomotion in EVP biofluids like mucus, treating the flagellar bundle as driving the solvent while exchanging momentum with polymers via relative-velocity drag. Finite-difference discretization couples with slender-body theory for flagellar forcing, …
Cascade Brillouin Scattering with Short-Lived Phonons Enables Novel Frequency Comb Generation
This paper introduces a new regime for cascade Brillouin scattering utilizing short-lived phonon modes where the Brillouin shift is smaller than the phonon mode width. This allows a single phonon mode to facilitate scattering across multiple optical mode pairs, resulting in a distinct cascade behavi…
Shock-Induced Isostructural Spin Transition in FeO
High-pressure shock compression experiments on FeO reveal an anomalous 7-10% volume collapse at approximately 60 GPa without a structural transition. This volume collapse is driven by an isostructural high-spin to low-spin metallic transition, directly evidenced by x-ray emission spectroscopy at 180…
Chiral Unitary Approach Explains Meson Photoproduction Resonances
This paper details a relativistic chiral unitary approach that utilizes coupled channels to investigate the photo- and electroproduction of eta and eta-prime mesons from nucleons. The study derives s-wave potentials from a chiral effective Lagrangian incorporating the axial U(1) anomaly, ultimately …
CLAS12 Quarks: Unveiling Proton Gluon Dynamics via J/ψ Photoproduction
The CLAS12 experiment at Jefferson Lab measured near-threshold J/ψ photoproduction cross sections. This data provides crucial insights into the non-perturbative regime of Quantum Chromodynamics (QCD), specifically focusing on the gluon distribution within the proton. The energy and t-dependence of t…
KM3NeT/ORCA Constrains Lorentz Invariance Violation with Atmospheric Neutrinos
The KM3NeT/ORCA detector, using its partial configuration of six detection units, analyzed 1.4 years of atmospheric neutrino data to search for isotropic Lorentz invariance violation. The study found no evidence of such violation. This research establishes new, competitive limits on specific isotrop…
Machine Learning for Real-Time Analysis at LHC
Machine learning (ML) is becoming increasingly vital for real-time analysis (RTA) in High Energy Physics (HEP), particularly within the challenging trigger systems of Large Hadron Collider (LHC) experiments. This whitepaper, compiled by the SMARTHEP network, provides a high-level overview of specifi…
ILC Technology Network Progress Toward Linear Collider Realization
The ILC Technology Network (ITN), established in 2022, is actively conducting engineering studies for the International Linear Collider (ILC). This network\
Pairon Excitations as the Missing Link in Cuprate High-Tc Superconductivity
Noat, Mauger, and Sacks propose that condensation in high-Tc cuprate superconductors is governed by strong coupling between the condensate and pairon (pair excitation) states, following Bose statistics — not by retardation-based mechanisms like phonon or spin-fluctuation mediation. Their model deriv…
Coupled-Cluster Imaginary-Time Evolution for Irreasonable Solutions
This paper introduces a coupled-cluster formalism utilizing imaginary-time evolution from an arbitrary reference. This method converges to standard coupled-cluster amplitude equations when finite solutions exist. Crucially, it provides additional information even when standard solutions are not avai…
Kirkwood-Dirac Distributions Unify Optical Coherence
This paper elucidates the role of Kirkwood-Dirac (KD) distributions in classical optics, establishing a direct link between these distributions and optical coherence. The authors demonstrate that KD distributions serve as generalized mutual coherence functions, offering a unified framework to interp…
Effective Intensity Matching for Ionization Mechanism Discrimination
A novel experimental technique, Effective Intensity Matching (EIM) coupled with Intensity Selective Scanning (ISS), enables the comparison of ionization processes in ultrafast laser pulses, independent of pulse ellipticity and diffraction effects. This method allows for direct comparison with theore…
Ultrafast Tunnel Ionization Induces Simultaneous Electron Excitation
This paper presents experimental evidence demonstrating that ultrafast multi-electron tunnel ionization of argon atoms, using circularly-polarized 50 femtosecond laser pulses, results in simultaneous excitation of remaining electrons via a "shake-up" mechanism. This contradicts traditional models th…
Withdrawn Paper Challenges Electromagnetism Gauge Concept
This withdrawn paper critically examines the "gauge concept" in electromagnetism, deeming it fallacious. The authors posit that "groupthink" perpetuated this concept within physics literature. The paper suggests that the simplicity of refuting the concept implies a historical neglect of scientific r…
Symmetry-Based Qubits for Deterministic Linear-Optical Quantum Computing
This paper introduces a novel approach to deterministic linear-optical quantum computing by utilizing a nonstandard, symmetry-based qubit. This method enables the creation of compact, low-resource controlled-NOT (CNOT) gates without relying on post-selection or ancillary measurements. The proposed a…
Experimental Realization of Continuous-Variable Two-Dimensional Microwave Cluster States
This paper demonstrates the experimental creation of 2D continuous-variable (CV) cluster states in the microwave domain, utilizing 191 microwave frequency modes. The technique involves exposing vacuum fluctuations to a Josephson Parametric Amplifier with precisely tuned pump tones. This method succe…
New Quantifiers and Detectors for Quantum-State Texture
This paper introduces a novel method for quantifying quantum-state texture using the $\alpha$-$z$ Rényi relative entropy. It also explores the interconnections between existing texture measures and proposes the systematic integration of texture witnesses, akin to other resource theories in quantum m…
Interaction-mediated non-reciprocity in open quantum systems
This paper investigates how density-density interactions facilitate the transfer of bath-induced non-reciprocity across different degrees of freedom in open quantum many-body systems. The study utilizes an analytically solvable model, a 1D spin-1/2 Fermi-Hubbard chain with all-to-all Hatsugai-Kohmot…
John Preskill’s Enduring Influence on Theoretical Physics Nomenclature
John Preskill, a prominent theoretical physicist, continues to influence the academic discourse, notably by coining phrases that inspire research paper titles. This demonstrates his impact extends beyond direct research contributions to shaping the linguistic landscape of theoretical physics. His in…
Experimental Observation of Conformal Field Theory Spectra in Quantum Phase Transitions
This work presents the first direct experimental observation of energy excitation spectra in emergent Conformal Field Theories (CFTs) at quantum phase transitions. The researchers developed and implemented a modulation technique to resolve the finite-size spectra of a Rydberg chain, which was tuned …
Quantum Criticality Enhances Sensing Beyond Standard Limits
This paper details interferometric sensing protocols leveraging quantum critical wavefunctions, comparing their performance against GHZ and spin-squeezed states. It introduces a symmetry-based algorithm for optimal measurement strategies in both magnetic and Rydberg atom systems. The research invest…
Temporal Symmetry as a Heuristic for Quantum Teleportation Applications
Quantum teleportation can be modeled via time-symmetric descriptions involving forward and backward temporal particle movement. This specific conceptual framework provides actionable intuition for developing new quantum applications.
Cavity Axion Haloscope Repurposed to Set Leading Constraints on High-Frequency Gravitational Waves from Black Hole Superradiance
Reanalysis of CAPP-12T MC axion haloscope data at 5.311 GHz detects no monochromatic high-frequency gravitational waves (HFGW), yielding 90% CL strain exclusion limits of h_0 ≈ 3.9 × 10^{-21} in optimal sky regions. In the black hole superradiance axion cloud model, this excludes M_BH ≃ 1.22 × 10^{-…
Solid-State Thorium-229 Nuclear Clocks: Prospects and Challenges
This paper reviews the potential of solid-state nuclear clocks utilizing the low-energy 8.4 eV nuclear transition in Thorium-229. The authors discuss the fundamental physics, technological hurdles, and current limitations of atomic clocks, contrasting them with the prospective advantages of a Th-229…
Many-Body Phenomena in Germanium Quantum Dots
Researchers have successfully performed spectroscopy on an array of eight interacting spins in gate-defined germanium quantum dots. This work advances quantum simulation by demonstrating a method to reconstruct the complete energy spectrum of many-body eigenstates. A significant finding is the obser…
Enhanced Randomness Extraction from Causally Independent Processes
This paper demonstrates a method for extracting uniform randomness from two causally independent processes, even when their inputs are correlated. This advances previous work that assumed conditional independence. The key innovation lies in leveraging spacelike separation to enforce channel independ…
Experimental Verification of Relativistic Bohmian Mechanics
This paper reports the first direct observation of relativistic aspects within Bohmian mechanics using weak measurement techniques in a double-slit interferometer. The experiment reconstructs relativistic Bohmian trajectories of single photons and reveals negative effective squared mass density, ind…
Ab Initio DFT Model Unifies Thermophysical and Optical Properties in Two-Temperature Warm Dense Matter
Presents an ab initio density functional theory model for thermophysical and optical properties of two-temperature warm dense matter, featuring heated electrons and cold ions in a solid lattice during ultrafast laser heating. Optical properties are computed via the Kubo-Greenwood formula. The model …
Uncertainty about Physical Processes Amplifies Information's Energetic Value Beyond kT ln 2
Standard information-energy tradeoffs assign kT ln 2 as the fundamental cost per bit exchanged with a thermal reservoir. However, when uncertainty exists about the specific physical process occurring, the energetic value of resolving that information exceeds kT ln 2 per bit. This effect arises in sc…
Re-evaluating Testability and Probability in Everettian Quantum Theory
This paper argues that common objections to the testability of Everettian Quantum Theory (EQT) stem from misunderstandings of probability and scientific testing methodology. By correcting these misconceptions, the author posits that EQT is indeed testable and, furthermore, that stochastic processes …
A Physicalist Framework for Information via Constructor Theory
This paper proposes a 'Constructor Theory of Information' that defines information solely through the lens of physically possible and impossible transformations. By treating information as a physical entity rather than a mathematical abstraction, it seeks to resolve foundational circularities in inf…
Constructor Theory: A Unified Framework for Fundamental Physics
Constructor theory offers a novel foundational approach to physics, diverging from traditional predictive models by framing fundamental laws in terms of possible and impossible transformations. This framework aims to unify various scientific domains, including information theory and computation, by …