The confluence of major theoretical, experimental, and observational advances are providing a unique perspective on the equation state dense neutron-rich matter—particularly its symmetry energy—and imprint mass-radius relation for neutron stars. In this contribution, we organize these developments in an density ladder. Of particular relevance to discussion impact various rungs identification po...

Abstract Recent studies of quantum field theory in FLRW spacetime suggest that the cause speeding up universe is running vacuum (RV), see Moreno-Pulido and Solà Peracaula (Eur Phys J C 82(6):551, 2022; Eur 80(8):692, 2020). Appropriate renormalization energy-momentum tensor shows energy density a smooth function Hubble rate its derivatives: $$\rho _\textrm{vac}=\rho _\textrm{vac}(H, {\dot{H}},\...

We reformulate the nested coordinate Bethe ansatz in terms of coproducts of Yangian symmetry generators. This allows us to derive the nested Bethe equations for the bound state string S-matrices. We find that they coincide with the Bethe equations obtained from a fusion procedure. The bound state number dependence in the Bethe equations appears through the parameters x± and the dressing phase o...

Reinforcement learning is based on exploration of the environment and receiving reward that indicates which actions taken by the agent are good and which ones are bad. In many applications receiving even the first reward may require long exploration, during which the agent has no information about its progress. This paper presents an approach that makes it possible to use pre-existing knowledge...

We report here new electrical laws, derived from nonlinear electro-diffusion theory, about the effect of the local geometrical structure, such as curvature, on the electrical properties of a cell. We adopt the Poisson-Nernst-Planck (PNP) equations for charge concentration and electric potential as a model of electro-diffusion. In the case at hand, the entire boundary is impermeable to ions and ...

We obtain, using the Birman-Schwinger method, upper limits on the total number of bound states and on the number of l-wave bound states of the semirelativistic spinless Salpeter equation. We also obtain a simple condition, in the ultrarelativistic case (m = 0), for the existence of at least one l-wave bound states: C(l, p/(p− 1)) ∫∞ 0 dr r p−1 |V −(r)|p ≥ 1, where C(l, p/(p− 1)) is a known func...