Analytic study of properties of holographic superconductors in Born-Infeld electrodynamics

In this paper, based on the Sturm-Liouville eigenvalue problem, we analytically investigate several properties of holographic s-wave superconductors in the background of a Schwarzschild-AdS spacetime in the framework of Born-Infeld electrodynamics. Based on a perturbative approach, we explicitly find the relation between the critical temperature and the charge density and also the fact that the Born-Infeld coupling parameter indeed affects the formation of scalar hair at low temperatures. Higher value of the Born-Infeld parameter results in a harder condensation to form. We further compute the critical exponent associated with the condensation near the critical temperature. The analytical results obtained are found to be in good agreement with the existing numerical results.Comment: 12 pages, LateX, To appear in JHE

A Reappraisal of Stratigraphy of Bagh Group of Rocks in Dhar District, Madhya Pradesh with an Outline of Origin of Nodularity of Nodular Limestone Formation

Upper Cretaceous Bagh Group of rocks in M.P. have been studied by many workers. Several stratigraphic successions have been proposed. It has resulted in controversies in terms of applicability, absence of characterization of contact surfaces, no mention of locality names where characteristic features are well visible. Hence a new stratigraphic succession has been proposed. Besides, the entire area is characterized by different types of nodularity at least in the lower part of carbonates. This worldwide unique characteristic has not been resolved earlier. The present authors have tried to explain the origin of this nodularity on the basis of adequate field evidences and came to the conclusion that overburden mechanical compaction produced by Lametas and Deccan Trap and subsequent chemical compaction are the ultimate cause of nodularity in the carbonates. Later entire area was reactivated and churned by Thallassinoid burrow producing organism, the presence of which bears testimony

The rice leaf blast pathogen undergoes developmental processes typical of root-infecting fungi

Pathogens have evolved different strategies to overcome the various barriers that they encounter during infection of their hosts1. The rice blast fungus Magnaporthe grisea causes one of the most damaging diseases of cultivated rice and has emerged as a paradigm system for investigation of foliar pathogenicity. This fungus undergoes a series of well-defined developmental steps during leaf infection, including the formation of elaborate penetration structures (appressoria). This process has been studied in great detail2, and over thirty M. grisea genes that condition leaf infection have been identified3. Here we show a new facet of the M. grisea life cycle: this fungus can undergo a different (and previously uncharacterized) set of programmed developmental events that are typical of root-infecting pathogens. We also show that root colonization can lead to systemic invasion and the development of classical disease symptoms on the aerial parts of the plant. Gene-for-gene type specific disease resistance that is effective against rice blast in leaves also operates in roots. These findings have significant implications for fungal development, epidemiology, plant breeding and disease control