The fundamental interactions governed by quantum electrodynamics (QED) are intrinsically rich in quantum resources, yet how these resources dynamically redistribute during relativistic scattering is still not fully understood. In this work, we systematically investigate the tree-level Bhabha scattering process ( <math altimg='si14.svg'><mrow><msup><mi>e</mi><mo>&#8722;</mo></msup><msup><mi>e</mi><mo>+</mo></msup><mo>&#8594;</mo><msup><mi>e</mi><mo>&#8722;</mo></msup><msup><mi>e</mi><mo>+</mo></msup></mrow></math>) within the framework of quantum resource theory, revealing how QED kinematics and Feynman amplitudes strictly dictate resource redistribution. Specifically, we demonstrate a strict anti-correlation between entropic uncertainty and dynamically generated entanglement across diverse initial states. We find that mass-induced single-helicity-flip transitions cause a pronounced geometric symmetry breaking in the non-relativistic regime, whereas the restoration of chiral symmetry in the ultra-relativistic limit ensures strict symmetry about the backward scattering angle. Furthermore, we analytically establish a rigorous equivalence between local wave-particle duality and global bipartite quantum coherence. Finally, evaluating the trade-off between local duality and Bell nonlocality, we show that in the ultra-relativistic limit, transverse scattering of basic factorized states equalizes the <italic>s</italic>- and <italic>t</italic>-channel amplitudes to optimize non-local correlations. However, pre-existing local coherence inevitably disrupts this delicate kinematic balance, significantly suppressing the Bell parameter and preventing the maximal violation of local realism. Therefore, we believe the present results provide deeper understanding of the fundamental quantum nature of QED processes.

China

Zan Cao

Meng-Long Song

Xue-Ke Song

Liu Ye

Dong Wang

Dynamical redistribution of quantum resources in tree-level Bhabha scattering

We investigate velocity and displacement memory in plane gravitational waves beyond the usual sandwich approximation. The central question is whether the memory observables remain meaningful when the wave profile is continuously decaying rather than compactly supported. We show that there is a critical inverse-square falloff: faster-decaying tails can preserve memory even when the outgoing motion is no longer strictly free, whereas inverse-square or slower tails destroy the standard memory observables. The inverse-cubic and inverse-square profiles illustrate these two possibilities, respectively.

Qi-Liang Zhao

Li-Ming Cao

Plane-wave memory beyond the sandwich approximation

We investigate the cosmological implications of the mass-to-horizon relation, which provides a unified framework for thermodynamically consistent generalized horizon-entropy functionals. Using the Cai–Kim formulation of the first law of thermodynamics, we derive the corresponding modified Friedmann equations and examine the resulting background evolution. We find that cosmological viability sharply restricts admissible deviations from the Bekenstein–Hawking area law: phenomenologically acceptable scenarios are confined to a narrow neighborhood of the standard entropy, while more pronounced deviations generically spoil the standard radiation–matter–dark-energy sequence. Power-law entanglement corrections can give rise to a moderate early-dark-energy component, but only within a tightly constrained region of parameter space, whereas quantum-gravity corrections are suppressed by the Planck scale and remain observationally irrelevant. Consequently, all viable models predict a ΛCDM-like cosmological background at the present epoch. These findings demonstrate that background cosmology alone imposes stringent constraints on thermodynamically consistent generalized entropy constructions of this class.

Poland

Pranav Prasanthan

Hussain Gohar

Vincenzo Salzano

Modified cosmology from mass-to-horizon relation: Background evolution

Unmodeled beyond Standard Model (BSM) physics in neutrino propagation can masquerade as parameter degeneracies in future precision measurements. Because the upcoming DUNE and T2HK experiments will operate at substantially different baselines, interpreting their data under the standard three-flavor framework provides a powerful diagnostic tool: any propagation BSM effect can manifest as an artificial tension between their extracted parameters. We demonstrate this principle using the complex non-standard interactions (NSI) currently favored to resolve the ∼ 2 <italic>&#963;</italic> tension between NO <italic>&#957;</italic>A and T2K. If these NSI solutions are realized, the NSI-induced interference term <math altimg='si19.svg'><mrow><mo>&#8733;</mo><mi>sin</mi><mo>(</mo><msub><mi>&#948;</mi><mrow><mrow><mi mathvariant='normal'>C</mi></mrow><mi>P</mi></mrow></msub><mo linebreak='goodbreak'>+</mo><mi>&#981;</mi><mo>)</mo></mrow></math> systematically distorts the DUNE appearance rates, leading to a correlated misidentification of the atmospheric mixing octant and the CP phase <italic>&#948;</italic> <inf>CP</inf>. Specifically, for &#949; <inf><italic>e&#956;</italic></inf> (&#949; <inf><italic>e&#964;</italic></inf>) NSI, the DUNE fit shifts toward CP- conserving values (the opposite CP half-plane) along with a preference for the wrong octant. In contrast, the shorter-baseline T2HK experiment remains largely insensitive to this effect. The resulting &#8239;&#8764;&#8239;3 <italic>&#963;</italic> incompatibility between the DUNE and T2HK standard-fit results (after 6 years of data collection for each experiment) can provide a powerful experimental diagnostic for propagation NSI, illustrating how baseline complementarity can be a valuable tool to uncover new physics in the precision era.

João Paulo Pinheiro

India

Ushak Rahaman

Diagnosing unmodeled neutrino physics via DUNE and T2HK complementarity

We show that the complex Clifford algebra <math altimg='si28.svg'><mrow><mi mathvariant='double-struck'>C</mi><mi>&#8467;</mi><mo>(</mo><mn>10</mn><mo>)</mo></mrow></math> admits an algebraic realisation of three linearly independent fermion generations, each carrying the correct Standard Model gauge quantum numbers under the gauge group <italic>SU</italic>(3) <inf><italic>C</italic></inf>&#8239;&#215;&#8239; <italic>SU</italic>(2) <inf><italic>L</italic></inf>&#8239;&#215;&#8239; <italic>U</italic>(1) <inf><italic>Y</italic></inf>.

Niels Gresnigt

Three fermion generations and an untriplicated gauge sector with <italic>S</italic> <inf>3</inf> family symmetry

In this work, we study the decays <italic>&#967;<inf>bJ</inf></italic>(2 <italic>P</italic>)&#8239;&#8594;&#8239; <italic>&#969;</italic>&#933;(1 <italic>S</italic>) using the intermediate meson loop mechanism combined with an effective Lagrangian approach. Within the commonly adopted range of the form factor parameter <math altimg='si4.svg'><mrow><mi>&#945;</mi><mo linebreak='goodbreak'>=</mo><mn>0.8</mn></mrow></math> to 4, the calculated decay widths are found to be consistent with the experimental data. We further predict the partial decay widths of the <italic>&#967;<inf>bJ</inf></italic>(3 <italic>P</italic>)&#8239;&#8594;&#8239; <italic>&#969;</italic>&#933;(1 <italic>S</italic>) decay to be of order 0.1&#8201;keV. We also give the ratios of relative decay widths, which are found to be almost independent of <italic>&#945;</italic>. These predictions await future verification by Belle II and BaBar experiments.

Run-Hao Chen

Hao-Dong Cai

Gang Li

Shi-Dong Liu

Study of <italic>&#967;<inf>bJ</inf></italic>( <italic>nP</italic>)&#8239;&#8594;&#8239; <italic>&#969;</italic>&#933;(1 <italic>S</italic>) via intermediate meson loop mechanism

We identify a local boundary signature of Berry holonomy in projective quantum geometry. In the minimal <math altimg='si6.svg'><mrow><msup><mi mathvariant='double-struck'>CP</mi><mn>1</mn></msup><mo>&#8771;</mo><msup><mi>S</mi><mn>2</mn></msup></mrow></math> realization, Berry curvature defines a geometric holonomy parameter <italic>&#945;</italic> <inf>geom</inf> for a quantum probe encircling a localized curvature defect. The corresponding reduced radial dynamics takes the form of an Aharonov&#8211;Bohm problem with an effective angular-momentum shift <math altimg='si7.svg'><mrow><mi>&#8467;</mi><mo>&#8594;</mo><mi>&#8467;</mi><mo linebreak='goodbreak'>&#8722;</mo><msub><mi>&#945;</mi><mrow><mrow><mi mathvariant='normal'>g</mi></mrow><mi>e</mi><mi>o</mi><mi>m</mi></mrow></msub></mrow></math>. In the lowest channel, this shift changes the Bessel order of the radial kernel from 0 to <italic>&#945;</italic> <inf>geom</inf>. Expanding the kernel for small holonomy generates the order derivative <math altimg='si8.svg'><mrow><msub><mi>&#8706;</mi><mi>&#957;</mi></msub><msub><mi>J</mi><mi>&#957;</mi></msub><msub><mrow><mo>|</mo></mrow><mrow><mi>&#957;</mi><mo>=</mo><mn>0</mn></mrow></msub></mrow></math>, which is proportional to the Neumann function <italic>Y</italic> <inf>0</inf>. Since <italic>Y</italic> <inf>0</inf>( <italic>z</italic>)&#8239;&#8764;&#8239;ln&#8201; <italic>z</italic> for <italic>z</italic>&#8239;&#8810;&#8239;1, with <math altimg='si9.svg'><mrow><mi>z</mi><mo linebreak='goodbreak'>=</mo><mi>p</mi><mi>r</mi></mrow></math>, Berry holonomy produces a logarithmic boundary response in the near-core radial kernel. This logarithm is the perturbative form of the exact fractional behavior <math altimg='si10.svg'><msup><mi>r</mi><msub><mi>&#945;</mi><mrow><mrow><mi mathvariant='normal'>g</mi></mrow><mi>e</mi><mi>o</mi><mi>m</mi></mrow></msub></msup></math>, and therefore represents a boundary-domain signature of holonomy rather than a spurious singularity. The associated exponential-integral kernel places the near-core problem in the standard class of two-dimensional contact renormalization and self-adjoint extension. These results show that Berry-curvature holonomy in projective quantum geometry can leave a precise local imprint in the boundary structure of quantum probe dynamics.

Thailand

Samak Boonpan

A local boundary signature of Berry holonomy in projective quantum geometry

Although previous results have ruled out the possibility of a static event horizon in cosmology, we present black hole and white hole metrics that retain static event horizons while reproducing cosmological behavior at large distances. Using an appropriate coordinate choice, we demonstrate that a static event horizon can exist in a cosmological setting without introducing curvature invariant singularities at the horizon. The resulting metric reduces to the Schwarzschild–de Sitter solution when the Hubble parameter is constant. We find that white hole metrics in an expanding universe (or black holes in a contracting universe) are significantly easier to construct, as a black hole in an expanding cosmology requires the velocity function to change sign. Consequently, this work initially examines white holes in expanding cosmologies as a foundation for subsequent analysis of black holes in expanding universes. In later sections, we investigate scenarios involving a white hole coupled with cosmological matter, as well as a white hole with both matter and a cosmological constant. Assuming the pressure component takes its cosmological value, we show that the physical radius of the apparent horizon can asymptotically approach a constant value at late times. This metric avoids pathologies such as a singular horizon in the limit of a vanishing Hubble parameter. Finally, we analyze the realistic case of a black hole embedded in pressureless cosmological matter with and without a cosmological constant and explore its properties. We specifically show that the velocity function can become zero and change sign in the vicinity of a black hole. This means we can smoothly transition from an expanding cosmological phase with a positive velocity function to a contracting black hole phase with a negative velocity function.

Iran

Ida M․ Rasulian

Amjad Ashoorioon

Static horizons in cosmology

We investigate black hole area quantization by imposing Landauer’s principle on the discrete entropy change between consecutive area levels. The elementary transition is identified with the entropy cost of erasing one bit of information, <math altimg='si1.svg'><mrow><mstyle mathvariant='normal'><mi>&#916;</mi></mstyle><mi>S</mi><mo linebreak='goodbreak'>=</mo><msub><mi>k</mi><mi>B</mi></msub><mi>ln</mi><mn>2</mn></mrow></math>. For the Bekenstein&#8211;Hawking entropy, this gives the standard Bekenstein&#8211;Mukhanov value of the area spectrum parameter, which is used as the reference limit. The same discrete construction is then applied to generalized entropy functionals. For Barrow entropy, the parameter <italic>&#947;</italic> becomes level dependent, while the relative separation between adjacent area levels still vanishes for large <italic>n</italic>. For the modified R&#233;nyi entropy, the nonsingular branch has vanishing relative spacing at large <italic>n</italic>, whereas the singular branch develops a finite-level pole. For the modified Kaniadakis entropy, the small <italic>&#954;</italic> expansion shows that a fixed deformation parameter prevents the relative area spacing from vanishing in the large <italic>n</italic> limit. Overall, the results suggest that Landauer&#8217;s principle provides a useful way to analyze generalized entropic extensions of the Bekenstein&#8211;Mukhanov approach.

Brazil

Jorge Ananias Neto

Ronaldo Thibes

Generalized entropies and black hole area quantization from Landauer’s principle

We investigate the low-energy interactions between the charmonium state <italic>J</italic>/ <italic>&#968;</italic> and the light pseudoscalar mesons ( <italic>&#960;</italic> and <italic>K</italic>) within the framework of dispersion relations. We demonstrate that the symmetry-breaking terms in the chiral Lagrangian induce mixing between the bare charmonium fields, necessitating a diagonalization procedure to correctly identify the physical <italic>J</italic>/ <italic>&#968;</italic> and <italic>&#968;</italic>&#8242; states. Using the resulting diagonalized Lagrangian, we construct the crossed-channel amplitudes for <math altimg='si4.svg'><mrow><mi>J</mi><mo linebreak='goodbreak'>/</mo><mi>&#968;</mi><mi>J</mi><mo linebreak='goodbreak'>/</mo><mi>&#968;</mi><mo>&#8594;</mo><mi mathvariant='script'>P</mi><mover accent='true'><mi mathvariant='script'>P</mi><mo>&#175;</mo></mover></mrow></math> and incorporate the <italic>&#960;&#960;</italic> and <math altimg='si5.svg'><mrow><mi>K</mi><mover accent='true'><mi>K</mi><mo>&#175;</mo></mover></mrow></math> rescattering effects through dispersion relations. This framework is used consistently both in the phenomenological extraction of the transition parameters from <italic>&#968;</italic>&#8242;&#8239;&#8594;&#8239; <italic>J</italic>/ <italic>&#968;&#960;&#960;</italic> and in the continuation of the crossed amplitudes to the near-threshold <math altimg='si8.svg'><mrow><mi>J</mi><mo linebreak='goodbreak'>/</mo><mi>&#968;</mi><mi mathvariant='script'>P</mi><mspace width='0.33em' /><mo>(</mo><mi mathvariant='script'>P</mi><mo linebreak='goodbreak'>=</mo><mi>&#960;</mi><mo>,</mo><mi>K</mi><mo>)</mo></mrow></math> region. As a result, we determine both the scattering lengths and the effective ranges. We obtain the upper-bound estimates <math altimg='si9.svg'><mrow><msub><mi>a</mi><mrow><mi>J</mi><mo>/</mo><mi>&#968;</mi><mi>&#960;</mi></mrow></msub><mo>&#8818;</mo><mo>&#8722;</mo><mn>0.0037</mn></mrow></math> fm and <math altimg='si10.svg'><mrow><msub><mi>a</mi><mrow><mi>J</mi><mo>/</mo><mi>&#968;</mi><mi>K</mi></mrow></msub><mo>&#8818;</mo><mo>&#8722;</mo><mn>0.049</mn></mrow></math> fm, where the negative sign indicates an attractive interaction without a bound state in our convention. Our results show that the <italic>J</italic>/ <italic>&#968;K</italic> interaction is moderately enhanced relative to the pion channel, driven by explicit chiral symmetry breaking. Furthermore, a quantitative comparison of the coupled-channel mechanism, where <italic>J</italic>/ <italic>&#968;&#960;</italic> and <italic>J</italic>/ <italic>&#968;K</italic> couple to open-charm channels, reveals that both <italic>J</italic>/ <italic>&#968;&#960;</italic> and <italic>J</italic>/ <italic>&#968;K</italic> scatterings are predominantly governed by the soft-gluon exchange mechanism.

Jiang Yan

Xiong-Hui Cao

Meng-Lin Du

Feng-Kun Guo

Low-energy scattering of the <italic>J</italic>/ <italic>&#968;&#960;</italic> and <italic>J</italic>/ <italic>&#968;K</italic> systems