Results 91 to 100 of about 1,159,790 (329)

The power of Lorentzian wormholes

Journal of High Energy Physics, 2023
As shown by Louko and Sorkin in 1995, topology change in Lorentzian signature involves spacetimes with singular points, which they called crotches. We modify their construction to obtain Lorentzian semiclassical wormholes in asymptotically AdS.
Andreas Blommaert, Jorrit Kruthoff, Shunyu Yao   +2 more
doaj   +1 more source

The cobordism class of the multiple points of immersions

, 2006
Let f: M -> N be an even codimensional immersion between smooth manifolds. We derive an explicit formula for the Pontrjagin numbers and signature of the multiple point manifolds in terms of singular cohomology of M and N, the maps induced between these ...
Gábor Braun, Hirzebruch
core   +1 more source

Photoswitching Conduction in Framework Materials

Advanced Functional Materials, EarlyView.
This mini‐review summarizes recent advances in state‐of‐the‐art proton and electron conduction in framework materials that can be remotely and reversibly switched on and off by light. It discusses the various photoswitching conduction mechanisms and the strategies employed to enhance photoswitched conductivity.
Helmy Pacheco Hernandez, Stefan Hecht, Wolfgang Wenzel, Lars Heinke, Mariana Kozlowska   +4 more
wiley   +1 more source

A metric of influential spreading during contagion dynamics through the air transportation network. [PDF]

PLoS ONE, 2012
The spread of infectious diseases at the global scale is mediated by long-range human travel. Our ability to predict the impact of an outbreak on human health requires understanding the spatiotemporal signature of early-time spreading from a specific ...
Christos Nicolaides, Luis Cueto-Felgueroso, Marta C González, Ruben Juanes   +3 more
doaj   +1 more source

Signature for the Shape of the Universe

, 2001
If the universe has a nontrivial shape (topology) the sky may show multiple correlated images of cosmic objects. These correlations can be couched in terms of distance correlations.
A. F. F. TEIXEIRA, Bernui A., Cornish N. J., G. I. GOMERO, Lehoucq R., Lehoucq R., Levin J. J., Levin J. J., M. J. REBOUÇAS, Rebouças M. J., Uzan J.-P.   +10 more
core   +1 more source

Direct Evidence of Topological Dirac Fermions in a Low Carrier Density Correlated 5d Oxide

Advanced Functional Materials, EarlyView.
The 5d oxide BiRe2O6 is discovered as a low‐carrier‐density topological semimetal hosting symmetry‐protected Dirac fermions stabilized by nonsymmorphic symmetries. Angle‐resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements reveal gapless Dirac cones, quasi‐2D Fermi surfaces, high carrier mobility, and a field ...
Premakumar Yanda, Jorge Cardenas‐Gamboa, Ding Pei, François Bertran, Leila Noohinejad, Snehashish Chatterjee, Changjiang Yi, Iñigo Robredo, Horst Borrmann, Maia G. Vergniory, Chandra Shekhar, Claudia Felser   +11 more
wiley   +1 more source

Robustification of fault detection algorithm in a three‐phase induction motor using MCSA for various single and multiple faults

IET Electric Power Applications, 2021
Fault diagnosis in induction machines, particularly at a premature stage, has become necessary to avoid unexpected interruption of the industrial process.
K. C. Deekshit Kompella, Naga Sreenivasu Rongala, Srinivasa Rao Rayapudi, Venu Gopala Rao Mannam   +3 more
doaj   +1 more source

Knot Floer homology and the four-ball genus

, 2003
We use the knot filtration on the Heegaard Floer complex to define an integer invariant tau(K) for knots. Like the classical signature, this invariant gives a homomorphism from the knot concordance group to Z. As such, it gives lower bounds for the slice
Boileau, Donaldson, Gordon, Kauffman, Kawamura, Milnor, Ozsváth, Ozsváth, Peter Ozsváth, Rolfsen, Zoltán Szabó   +10 more
core   +2 more sources

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

Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce3TiSb5

Communications Materials
It is generally believed that electronic correlation, geometric frustration, and topology, individually, can facilitate the emergence of various intriguing properties that have attracted a broad audience for both fundamental research and potential ...
Xiaobo He, Ying Li, Yongheng Ge, Hai Zeng, Shi-Jie Song, Jie Liu, Shuo Zou, Zhuo Wang, Yuke Li, Wenxin Ding, Jianhui Dai, Guang-Han Cao, Xiao-Xiao Zhang, Tianyou Zhai, Gang Xu, Yongkang Luo   +15 more
doaj   +1 more source