Black rings in large D membrane paradigm at the first order

Black rings are the black objects found in D spacetime dimensional gravity when D ≥ 5. These have event horizon topology SD−3× S1. In this work the solutions of the large D membrane paradigm dual to stationary black rings in Einstein-Maxwell theory with or without cosmological constant are studied. It is shown that the first order membrane equations can only admit static asymptotically flat black rings, and the equilibrium angular velocity for the asymptotically AdS black rings at large D was obtained. The thermodynamic and dynamic stability of the asymptotically flat black ring solutions is studied. The apparent shortcomings of some of these results are argued to be curable within the large D membrane paradigm framework.

Studies on habit and habitat, external morphology, feeding capacity and prey preference of two striped spider, Telamonia dimidiata

Laboratory experiments were carried out to investigate habit and habitat, external morphology, preying capacity and prey preference of two striped spider, Telamonia dimidiata collected from different places of Uttar Pradesh India. It is found on trees, shrubs and paddy plants. Like other jumping spiders of family salticidae, these do not build webs and are sophisticated and active hunters. Telamonia dimidiata— recognisable by its distinctive two stripes on its back. This spider constructed a different web each night for three consecutive nights. “It is a cursorial hunter and does not use the web for hunting. Instead, it uses it as a resting ground to revisit, depending on whether it was disturbed or not,” The female is light yellowish, with a very white cephalus and red rings surrounding the narrow black rings round the eyes where as male is very dark, with white markings, and red hairs around the eyes. Both the sexes feed actively on mosquitoes and moths and other insect pests acting as an efficient bio-control agent in gardens and crop fields.