In 2017 I had the honor of meeting Steven Weinberg—whose obituary appears in October 2021 issue Physics Today (page 72)—at University Texas at Austin. past used some his writings from Scientific American and books for my students Wagner College, where taught honors lecture astronomy. often corresponded with 1994 to 2018 about concepts astrophysics, he answered many questions that submitted me.I...

The relevance of the Tremaine-Weinberg (TW) method is tested to measure the bar, spiral and inner structure pattern speeds using a gaseous velocity field. The TW method is applied to

The Coleman-Weinberg mechanism provides a procedure by which scalar field, initially has no mass parameters, acquires due to the anomalous nature of scale symmetry. Loop corrections trigger spontaneous symmetry breaking and appearance non-trivial vacuum. We first review basic example ColemanWeinberg mechanism, Quantum Electrodynamics, in perturbative regime where particle becomes massive throug...

When integrals in the standard Tremaine-Weinberg method are evaluated for the case of a realistic model of a doubly barred galaxy, their modifications introduced by the second rotating pattern are in accord with what can be derived from a simple extension of that method, based on separation of tracer’s density. This extension yields a qualitative argument that discriminates between prograde and...

The interaction of 3–level system with a quantum field in a non–equilibrium state is considered. We describe a class of states of the quantum field for wich a stationary state drives the system to inverse populated state. We find that the quotient of the population of the energy levels in the simplest case is described by the double Einstein formula which involves products of two Einstein emiss...