Results 141 to 150 of about 166,290,583 (305)
On modelling the surfaces of celestial bodies in quantum gravity
The European Physical Journal CAbstract We discuss how to model the surface of celestial bodies (such as stars) in quantum gravity to ensure the regularity of quantum corrections to classical solutions of general relativity at the surface of such bodies. Specifically, we use the Vilkovisky–DeWitt unique effective action to calculate universal quantum corrections to
Xavier Calmet, Marco Sebastianutti
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Quantum reduction to Bianchi I models in loop quantum gravity [PDF]
Physical Review D, 2015 5 pages. v2: partly rewritten to clarify derivation, gauge group enlarged from U(1) to R_Bohr, relation to old and new LQC dynamics discussed, previous results unchanged.
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Advanced Intelligent Systems, EarlyView.Inspired by the Mexican jumping bean, this study presents a centimeter‐scale, electronics‐free robot that merges principles from both the animal and plant kingdoms. A thermo‐responsive actuator mimicking larval motion, enclosed within a uniquely shaped plant‐seed‐inspired shell, generates jumping, rolling, flipping, sliding, and climbing through ...
Ragesh Chellattoan +3 more
wiley +1 more source
Angewandte Chemie, EarlyView.Spontaneously aligned, long‐range hexagonal columnar ordering is obtained in phase‐separated dynamic covalent networks by combining discrete siloxanes and dynamic acylsemicarbazide bonds. The ordered network shows improved (thermo)mechanical properties and creep resistance compared to the disordered network.
Stefan J. D. Maessen +6 more
wiley +2 more sources
Journal of High Energy PhysicsRecently, a new method was introduced for computing V g,1(b), the Weil-Petersson volumes of the moduli space of Riemann surfaces of genus g with one geodesic boundary of length b, various supersymmetric generalizations of them, as well as analogous ...
Clifford V. Johnson, João Rodrigues
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Quantum Gravity and Lorentz Invariance Violation in the Standard Model [PDF]
Physical Review Letters, 2005 The most important problem of fundamental Physics is the quantization of the gravitational field. A main difficulty is the lack of available experimental tests that discriminate among the theories proposed to quantize gravity. Recently, Lorentz invariance violation by Quantum Gravity(QG) have been the source of a growing interest.
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Multirobot Aerial Soft Manipulator for Floating Litter Collection
Advanced Intelligent Systems, EarlyView.A multirobot aerial manipulator enables autonomous floating litter collection by controlling the shape of a flexible rope equipped with a hook‐based tool. Adaptive rope‐shape planning enhances grasping performance while reducing tension, demonstrating the potential of aerial robots for floating litter removal. Removing floating litter from water bodies
Antonio González‐Morgado +8 more
wiley +1 more source
A Cable‐Driven Parallel Wire Robot for Probe Positioning and Tissue Palpation on Curved Phantoms
Advanced Intelligent Systems, EarlyView.A wearable cable‐driven parallel robot is introduced for autonomous ultrasound probe positioning and soft tissue palpation on curved surfaces. By combining visual feedback with tension‐optimized control, the system achieves millimeter‐scale positioning accuracy while enforcing safety force constraints.
Christina Patterson +2 more
wiley +1 more source
Angewandte Chemie, EarlyView.Same building blocks, different destinies. Pathway complexity directs nucleic acid–loaded polyion complex micelles along distinct assembly trajectories, resulting in either hexagonally shaped or spheroidal nanoparticles with distinct internal structuring.
Lennart van den Hoven +7 more
wiley +2 more sources
Model Categories and Quantum Gravity
, 2008 We propose a mathematically concrete way of modelling the suggestion that in quantum gravity the spacetime disappears, replacing it with a discrete approximation to the causal path space described as an object in a model category. One of the versions of our models appears as a thickening of spacetime, which we interpret as a formulation of relational ...
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