A weakly distance-regular digraph is thick if its attached scheme regular. In this paper, we show that each commutative has a subdigraph such the corresponding quotient falls into six families of digraphs up to isomorphism.

Young alpha-rich (YAR) stars have been detected in the past as outliers to local age − [ α /Fe] relation. These objects are enhanced -elements, but they apparently younger than typical thick disc stars. Here, we study global kinematics and chemical properties of YAR giant APOGEE DR17 survey show that similar those standard stellar population. This leads us conclude rejuvenated objects, most lik...

A bstract In this work, thick branes in Rastall gravity are investigated. Three types of maximally symmetric brane models constructed and the linear tensor perturbation is analyzed. flat model, modes either unstable or nonlocalizable for a nonvanishing parameter. de Sitter only ground state mode localized. anti-de number bound states infinity. For both models, condition stability parameter obta...