We propose that the two armed spiral features seen in visible Hubble Space Telescope images of scattered light in HD100546’s circumstellar disk are caused by the illumination of a warped outer disk. A tilt of 6-15 degrees from the symmetry plane can cause the observed surface brightness variations providing the disk is very twisted (highly warped) at radii greater than 200 AU where the spiral f...

Three dimensional topologically massive gravity (TMG) with a negative cosmological constant −l−2 and positive Newton constant G admits an AdS3 vacuum solution for any value of the graviton mass μ. These are all known to be perturbatively unstable except at the recently explored chiral point μl = 1. However we show herein that for every value of μl 6= 3 there are two other (potentially stable) v...

We consider a family of manifolds with a class of degenerating warped product metrics gǫ = ρ(ǫ, t) dt + ρ(ǫ, t)2bds2M , with M compact, ρ homogeneous degree one, a ≤ −1 and b > 0. We study the Laplace operator acting on L differential p-forms and give sharp accumulation rates for eigenvalues near the bottom of the essential spectrum of the limit manifold with metric g0.

We consider warped compactifications that solve the 10 dimensional supergravity equations of motion at a point, stabilize the position of a D3-brane world, and admit a warp factor that violates Lorentz invariance along the brane. This gives a string embedding of “asymmetrically warped” models which we use to calculate stringy (α′) corrections to standard model dispersion relations, paying atten...

The aim of this research is the study of Gray curvature identities, introduced by Alfred Gray in [7] for the class of almost hermitian manifolds. As known till now, there is no equivalent for the class of almost contact manifolds. For this purpose we use the Boohby-Wang fibration and the warped manifolds construction in order to establish which identities could be satisfied by an almost contact...

We analytically calculate the quasi-normal modes of various perturbations of spacelike stretched and null warped AdS 3 black holes. From AdS/CFT correspondence, these quasi-normal modes are expected to appear as the poles in momentum space of retarded Green functions of dual operators in CFT at finite temperature. We find that this is indeed the case, after taking into account of the subtle ide...

We consider a scenario in which our observable universe is a 3-dimensional surface (3-brane) living in extra dimensions with a warped geometry. We show that “lensed” density perturbations from other branes serve as possible seeds for structure formation on our observable brane (without inflation), and, in addition, provide constraints on braneworld scenarios with warped bulk geometry. Due to th...

We analytically calculate the quasi-normal modes of various perturbations of spacelike stretched and null warped AdS 3 black holes. From AdS/CFT correspondence, these quasi-normal modes are expected to appear as the poles in momentum space of retarded Green functions of dual operators in CFT at finite temperature. We find that this is indeed the case, after taking into account of the subtle ide...

Abstract This research concerns the use of warped ruled surfaces in load bearing structures 19th century stone bridges Prague. The descriptions a skew arch used at Negrelli Viaduct and special surface called “corne de vache” Legion Bridge are based not only on historical survey, archival materials period publications, but also contemporary measurements.