There are three regimes of gravitational-radiation-reaction-induced inspiral for a compact body with mass m , in a circular, equatorial orbit around a Kerr black hole with mass M@m: ~i! the adiabatic inspiral regime, in which the body gradually descends through a sequence of circular, geodesic orbits; ~ii! a transition regime, near the innermost stable circular orbit ~isco!; ~iii! the plunge re...

We study stability of a circular orbit of a spinning test particle in a Kerr spacetime. We find that some of the circular orbits become unstable in the direction perpendicular to the equatorial plane, although the orbits are still stable in the radial direction. Then for the large spin case (S ∼ O(1)), the innermost stable circular orbit (ISCO) appears before the minimum of the effective potent...

The coronavirus disease (COVID-19) pandemic has triggered and accelerated the shift of firms businesses to adopt flexible alternative work arrangements such as teleworking or working from home (WFH) set-ups. To effectively transition ‘new normal’ work, this paper measures telework potential jobs degree which a job can be feasibly done at offsite. Using task-based framework, constructs continuou...

BACKGROUND Traditionally, time-use data have been used to inform a broad range of economic and sociological research topics. One of the new areas in time-use research is the study of physical activity (PA) and physical activity energy expenditure (PAEE). Time-use data can be used to study PAEE by assigning MET values to daily activities using the Ainsworth Compendium of Physical Activities. Alt...