Results 51 to 60 of about 74,207 (261)

On trans-Sasakian $3$-manifolds as $\eta$-Einstein solitons

Karpatsʹkì Matematičnì Publìkacìï, 2021
The present paper is to deliberate the class of $3$-dimensional trans-Sasakian manifolds which admits $\eta$-Einstein solitons. We have studied $\eta$-Einstein solitons on $3$-dimensional trans-Sasakian manifolds where the Ricci tensors are Codazzi type ...
D. Ganguly, S. Dey, A. Bhattacharyya
doaj   +1 more source

New supersymmetric AdS4 type II vacua

, 2009
Building on our recent results on dynamic SU(3)xSU(3) structures we present a set of sufficient conditions for supersymmetric AdS4xM6 backgrounds of type IIA/IIB supergravity.
B.E.W. Nilsson, C. Beasley, C. Beasley, C.P. Boyer, D. Gaiotto, D. Gaiotto, D. Lüst, D. Lüst, D. Martelli, D.P. Sorokin, Dieter Lüst, Dimitrios Tsimpis, J.P. Gauntlett, J.P. Gauntlett, M. Graña, M. Gualtieri, M. Petrini, P. Koerber, T. Friedrich   +18 more
core   +1 more source

Design and Applications of Multi‐Frequency Programmable Metamaterials for Adaptive Stealth

Advanced Functional Materials, EarlyView.
This article provides a comprehensive overview of metamaterials, including their fundamental principles, properties, synthesis techniques, and applications in stealth, as well as their challenges and future prospects. It covers topics that are more advanced than those typically discussed in existing review articles, while still being closely connected ...
Jonathan Tersur Orasugh, Ankita Mohanty, Amit Malakar, Suryasarathi Bose, Suprakas Sinha Ray   +4 more
wiley   +1 more source

A new curvature-like tensor in an almost contact Riemannian manifold

Pracì Mìžnarodnogo Geometričnogo Centru, 2016
In a M. Prvanović’s paper [5], we can find a new curvature-like tensor in an almost Hermitian manifold.In this paper, we define a new curvature-like tensor, named contact holomorphic Riemannian, briefly (CHR), curvature tensor in an almost ...
Koji Matsumoto
doaj   +1 more source

Regge's Einstein-Hilbert Functional on the Double Tetrahedron [PDF]

, 2010
The double tetrahedron is the triangulation of the three-sphere gotten by gluing together two congruent tetrahedra along their boundaries. As a piecewise flat manifold, its geometry is determined by its six edge lengths, giving a notion of a metric on ...
Champion, Daniel, Glickenstein, David, Young, Andrea   +2 more
core  

Triangle Anomalies from Einstein Manifolds

, 2006
The triangle anomalies in conformal field theory, which can be used to determine the central charge a, correspond to the Chern-Simons couplings of gauge fields in AdS under the gauge/gravity correspondence. We present a simple geometrical formula for the
Benvenuti, Sergio, Tachikawa, Yuji, Zayas, Leopoldo A. Pando   +2 more
core   +3 more sources

Reinforced Concrete‐Inspired Multiscale Hierarchical Metamaterial Composite for Synergistic Enhancement Across Thermal, Electromagnetic, and Mechanical Domains

Advanced Functional Materials, EarlyView.
A structurally integrated multiscale hierarchical metamaterial composite (MHMC), inspired by the synergistic architecture of reinforced concrete, achieves simultaneous enhancement of thermal, electromagnetic, and mechanical functionalities. By combining a carbon black‐based mechanical metamaterial with a porosity‐graded cellulose acetate aerogel, this ...
Jeongwoo Lee, Junyeol Choi, Junyong Seo, Jaemin Lee, Dowon Noh, Hoyoung Jang, Hwanju Lim, Jinwoo Park, Run Hu, Wonjoon Choi   +9 more
wiley   +1 more source

Kobayashi—Hitchin correspondence for twisted vector bundles

Complex Manifolds, 2021
We prove the Kobayashi—Hitchin correspondence and the approximate Kobayashi—Hitchin correspondence for twisted holomorphic vector bundles on compact Kähler manifolds.
Perego Arvid
doaj   +1 more source

Einstein Manifolds As Yang-Mills Instantons

, 2013
It is well-known that Einstein gravity can be formulated as a gauge theory of Lorentz group where spin connections play a role of gauge fields and Riemann curvature tensors correspond to their field strengths.
Donaldson S. K., HYUN SEOK YANG, JOHN J. OH, Lawson H. B., Lee J., Misner C. W., Oh J. J.   +6 more
core   +1 more source

Aromatic Self‐Assembled Monolayers Enhance Lifetime of Silver SERS Substrates and Provide their Chemical Functionalization

Advanced Materials Interfaces, EarlyView.
Surface enhanced Raman spectroscopy (SERS) is a highly attractive method combining unique specificity with great sensitivity. For protecting the silver‐based SERS substrates, aromatic self‐assembled monolayers consisting of biphenyl‐4‐thiol and 4′‐nitro‐4‐biphenylthiol molecules are deposited and characterized.
Christof Neumann, Susanne Pahlow, Martha Frey, Andreas Arnlind, Martin Jahn, Maria Küllmer, Julian Picker, Uwe Hübner, Karina Weber, Jürgen Popp, Andrey Turchanin   +10 more
wiley   +1 more source