Sudhagar Suyamprakasam (CAMK, Warsaw)
he LIGO/Virgo/KAGRA (LVK) collaboration has discovered several dozen binary mergers since 2015; however, binary mergers are not the exclusive sources of gravitational waves. Asymmetric rotating neutron stars and planetary or asteroid mass-primordial BH (PBH) binaries during their in-spiral phase also emit quasi-monochromatic, long-duration gravitational waves. Detecting signals from these sources requires longer observation times due to their weak amplitude with respect to the current sensitivity of detectors, and thus far, the detection of those signals has not been confirmed yet. Suppose the massive object lies in the line of sight; the signal can undergo gravitational lensing. This presentation provides a brief overview of gravitational wave gravitational lensing, an emerging subdomain in gravitational wave astronomy, and the impact of the gravitational lensing signature in long-duration signals, which provides new possibilities for detecting the signals from those sources.
Luke Dones (Southwest Research Institute, Boulder, Colorado)
The existence of the Oort Cloud, the source of long-period comets (LPCs), was proposed in 1950. Until recently, most LPC discoveries were of comets that passed within 3 au of the Sun, where water ice sublimates vigorously. LPCs are now being disovered with perihelion distances beyond 10 au, and five have shown activity beyond 20 au on the inbound legs of their orbits. I will give a brief overview of the small-body populations in our Solar System; review models of the formation of the Oort Cloud; describe comets active far from the Sun; report on a prediction of a spiral structure in the inner Oort Cloud; and discuss prospects for the Legacy Survey of Space and Time of the Vera Rubin Observatory to discover many distant LPCs in the near future.
Jarosław Duda (Jagiellonian University, Cracow)
While naively laser only excites target, it can also cause its deexcitation – as stimulated emission, SASE (self-amplified spontaneous emission), synchrotron self-absorption, ASE (amplified spontaneous emission), or in Rabi cycle cyclically causing excitation and deexcitation. STED microscopy is a popular application of laser causing deexcitation - I would like to propose and discuss a few more, based on its properties suggested by CPT symmetry. For example, while CT scanner makes 3D maps of absorption coefficient, CPT symmetry suggests how to analogously measure/map emission coefficients, what should have much better transparency thanks to lower concentrations (N2 << N1). Related medical application could be causing deexcitation of autoluminescent molecules like NADH, e.g. to starve cancer tissue. It suggests also how to build new type of telescope - seeing synchrotron radiation, but not thermal. Finally, the original motivation was more symmetric and powerful two-way quantum computers (2WQC), for example with photonic chip between coupled laser resonators.
Surajit Kalita (Warsaw University Observatory)
Mirosław Kicia (CAMK PAN, Warsaw)
