Results 111 to 120 of about 186,264 (366)

Classical Euclidean wormhole solutions in Palatini $f(\tilde{R})$ cosmology

, 2012
We study the classical Euclidean wormholes in the context of extended theories of gravity. With no loss of generality, we use the dynamical equivalence between $f(\tilde{R})$ gravity and scalar-tensor theories to construct a point-like Lagrangian in the ...
A. G. Agnese, C. G. Boehmer, D. H. Coule, D. N. Page, F. Darabi, F. S. Accetta, F. S. N. Lobo, G. Allemandi, G. Allemandi, G. Allemandi, H. A. Buchdahl, H. Fukutaka, H. Fukutaka, I. Klebanov, J. Cheeger, J. J. Halliwell, J. O’Hanlon, K. K. Nandi, M. Roshan, M. Visser, O. Bertolami, P. F. González-Diaz, P. F. González-Diaz, S. Capoziello, S. Capoziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Coleman, S. Coleman, S. Giddings, S. Mignemi, S. Nojiri, S. Nojiri, S. W. Hawking, T. P. Sotiriou, Y. Verbin   +38 more
core   +1 more source

Recent Advances in Collective Behaviors of Micro/Nanomotor Swarms

Advanced Materials, EarlyView.
This review describes the driving forces behind collective motion, explores the self‐organization of micro/nano swarms across zero‐dimensional (0D), one‐dimensional (1D), two‐dimensional (2D), and three‐dimensional (3D) spaces, and highlights their potential in drug delivery, environmental monitoring, and smart devices.
Siwen Sun, Bingbing Sun, Alexander B. Cook, Tania Patiño Padial, Jan C. M. van Hest   +4 more
wiley   +1 more source

Ghirardi-Rimini-Weber model with massive flashes

, 2018
I introduce a modification of the Ghirardi-Rimini-Weber (GRW) model in which the flashes (or collapse space-time events) source a classical gravitational field.
Tilloy, Antoine
core   +1 more source

Aqueously Upcycled Lignin with Emergent Tribonegativity for Skin‐Integrated Triboelectronics

Advanced Materials, EarlyView.
Aqueously upcycled lignin is transformed into a printable ink that self‐assembles into a nanotextured surface during printing with the highest reported biopolymer‐based tribonegativity. The resulting skin‐integrated triboelectric sensor enables high‐fidelity cardiovascular monitoring and objective mental workload classification, demonstrating a ...
Robert Ccorahua‐Santo, Mi Li, Yi Zheng, Wenzhuo Wu   +3 more
wiley   +1 more source

Multi‐scale Engineered Vasculature and Hierarchical Porosity via Volumetric Bioprinting‐Guided Photopolymerization‐Induced Phase Separation

Advanced Materials, EarlyView.
Vascularization in bioprinted hydrogels is limited by nanoscale porosity in hydrogel bionks. Volumetric bioprinting of gelatin–norbornene phase‐separating hydrogels permits to create centimeter‐scale constructs featuring interconnected multi‐scale porosity. Light dose gradients result in spatially controlled pore dimensions. Capillary‐scale vessels are
Oksana Y. Dudaryeva, Maj‐Britt Buchholz, Gabriel Größbacher, Sofia Amaral, Sammy Florczak, Camille Bonhomme, Alvaro Rojo Ferrer, Mark W. Tibbitt, Riccardo Levato   +8 more
wiley   +1 more source

Pregeometry and spontaneous time-space asymmetry

Journal of High Energy Physics, 2022
In pregeometry a metric arises as a composite object at large distances. We investigate if its signature, which distinguishes between time and space, could be a result of the dynamics rather than being built in already in the formulation of a model.
C. Wetterich
doaj   +1 more source

On the Relations between Gravity and BF Theories [PDF]

, 2012
We review, in the light of recent developments, the existing relations between gravity and topological BF theories at the classical level. We include the Plebanski action in both self-dual and non-chiral formulations, their generalizations, and the ...
Freidel, Laurent, Speziale, Simone
core   +5 more sources

Hard‐Magnetic Soft Millirobots in Underactuated Systems

Advanced Robotics Research, EarlyView.
This review provides a comprehensive overview of hard‐magnetic soft millirobots in underactuated systems. It examines key advances in structural design, physics‐informed modeling, and control strategies, while highlighting the interplay among these domains.
Qiong Wang, Zixuan Zhang, Bingyan Li, Junkai Wang, Hongcheng Gu   +4 more
wiley   +1 more source

Kerr-Schild double copy for Kundt spacetimes of any dimension

Journal of High Energy Physics
We show that vacuum type N Kundt spacetimes in an arbitrary dimension admit a Kerr-Schild (KS) double copy. This is mostly done in a coordinate-independent way using the higher-dimensional Newman-Penrose formalism.
Marcello Ortaggio, Vojtěch Pravda, Alena Pravdová   +2 more
doaj   +1 more source

Gait Analysis of Pak Biawak: A Necrobot Lizard Built using the Skeleton of an Asian Water Monitor (Varanus Salvator)

Advanced Robotics Research, EarlyView.
Pak Biawak, a necrobot, embodies an unusual fusion of biology and robotics. Designed to repurpose natural structures after death, it challenges conventional boundaries between nature and engineering. Its movements are precise yet unsettling, raising questions about sustainability, ethics, and the untapped potential of biointegrated machines.
Leo Foulds, Donan Satria Yudha, Parvez Alam   +2 more
wiley   +1 more source