Physics Letters B

The recently measured energy-momentum spectral functions P ( k, E ) by the CLAS collaboration in triple-coincidence A ( e, e ′ Np ) measurements allow for improved studies of subthreshold particle production in proton heavy-ion collisions. The observed short range correlations (SRC) enhance the available center of mass energy of individual nucleon-nucleon collisions and allow therefore for sub-th…

It is well known that the algebra o (2, 4) generates the conformal group, but it can also be used to define some variants of the Yang model of noncommutative geometry on a curved spacetime. Starting from these examples, we construct a new physical model based on o (2, 4), that can be interpreted as a generalization of the Heisenberg algebra n phase space, with flat positions and momenta, but nont…

We study the late-time expansion history of the Universe within the VCDM model, a Type-II MMG realization that preserves the successes of General Relativity while extending beyond constant vacuum energy through a minimal Hamiltonian modification, generating a time-dependent vacuum sector without introducing additional degrees of freedom. We investigate this framework within a cosmographic approac…

The compressed-spectrum regime of the scotogenic model, where the inert charged state η ˜ ± and the dark matter candidate N 1 are nearly mass-degenerate (Δ M ≲ 20 GeV), remains largely inaccessible to current ATLAS and CMS displaced-lepton searches, which impose lepton p T ≳ 20–30 GeV requirements (and historically up to 65 GeV) that the soft decay products cannot satisfy. We propose a dedicated …

We perform a calculation of the invariant mass distributions in the ψ ( 3686 ) → Λ Λ ¯ η reaction, where a neat peak for the excitation of the Λ(1670) and Λ ¯ ( 1670 ) in the η Λ and η Λ ¯ mass distributions, respectively, is observed. Our approach uses the fact that the ψ (3686), a c c ¯ state, is a singlet of SU(3) in the u, d, s quarks and constructs the two flavor structures allowed with a ps…

Rigidity conditions for a body considered as a discrete system of relativistic particles are proposed. They by themselves do not yet determine an evolution of the system, and some second-order equations must be added to them. Poincaré-covariant equations of motion compatible with these rigidity conditions are proposed and discussed. The resulting theory has the expected six dynamical degrees of f…

First-order phase transitions of black holes have been extensively studied within thermodynamic frameworks, yet the corresponding evolution of spacetime geometric properties remains unclear. This paper establishes a purely differential geometric framework to probe such phase transitions by analyzing the curvature of unstable null orbits. Using the geodesic curvature of the null circular orbit in …

The third law of black hole dynamics states that it is impossible, through any classical perturbation of a stationary configuration, to reduce the surface gravity of a black hole to zero. In this work, we examine the validity of this law for static, spherically symmetric charged black holes in the Lovelock theory of gravity. By studying infinitesimal variations in mass and charge, we derive a set…

This study employs QCD sum rules to predict the masses and residues of spin- 3 2 doubly heavy baryons including two heavy quarks (c and/or b) and one light quark, specifically focusing on Ξ c c * , Ξ b c * , Ξ b b * , Ω c c * , Ω b c * and Ω b b * . Our study provides results for the ground state (1 S ), first orbital excitation (1 P ), and the first radial excitation (2 S ), within a consistent …

• A Finsler–Randers cosmological framework is developed by incorporating anisotropic geometric corrections through a model-independent parametrization of the deceleration parameter q(z). • Cosmological parameters are constrained using a joint analysis of Cosmic Chronometers (CC), DESI BAO, and DES Y5 Type Ia supernova datasets. • The combined dataset yields the best-fit parameters H 0 = 68.16 ± 0…

The inflationary paradigm has transformed our understanding of the early universe; yet most inflationary models are considered geodesically past-incomplete, suggesting a beginning of time or a primordial Big Bang singularity. The Borde–Guth–Vilenkin (BGV) theorem is often cited as demonstrating that all eternally inflating spacetimes must be past-incomplete. Utilizing a new theorem establishing g…

Neutrinos can experience fast flavor conversions (FFCs) in highly dense astrophysical environments, such as core-collapse supernovae and neutron star mergers, potentially affecting energy transport and other processes. The simulation of fast flavor conversions under realistic astrophysical conditions requires substantial computational resources and involves significant analytical challenges. Whil…

We consider spherically symmetric static black hole configurations that obey the vacuum equation of state: p r = − ρ , where p r is the radial pressure, ρ being energy density. We find in a closed form the metric for an arbitrary equation of state for tangential pressure p θ ( ρ ). The corresponding formulas enable us to embrace compact Schwarzschild-like configurations and dispersed systems. The…

We investigate quantum entanglement and coherence for four classes of Bell-like fermionic states in the vicinity of the event horizon of a Garfinkle-Horowitz-Strominger (GHS) dilaton black hole. Contrary to the common expectation that maximally entangled states always provide superior quantum resources, our results show that their entanglement can be lower than that of suitably chosen non-maximal…

Laser-controlled nuclear decay offers a new pathway for manipulating nuclear lifetimes. In this study, a novel scheme was proposed to indirectly manipulate α decay via electron screening in the scenario of laser-heated nanoclusters. We established a framework of the density-gradient-corrected screening model for the dynamically expanded cluster plasma, where the nonlocal effects on electron scree…

We introduce a method called resolution refinement that allows one to bootstrap eigenstate preparation on a quantum computer. We first prepare an eigenstate of a low-resolution Hamiltonian using any method of choice. The eigenstate is then lifted to higher resolution and adiabatically evolved to produce the corresponding eigenstate of a higher-fidelity Hamiltonian. We give examples of resolution …