Results 131 to 140 of about 9,570 (308)

The dynamics of cosmological scenarios inspired by quantum gravity

, 2006
PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core  

Heterotic Braneworld Gravity [PDF]

, 2009
In the past decade, there has been considerable interest in braneworld scenarios where the universe lives on a brane in a higher-dimensional bulk and gravity is modified.
LEKSONO, FITRI,ARMALIVIA
core  

Teleparallel Theories of Gravity: Illuminating a Fully Invariant Approach [PDF]

, 2019
Teleparallel gravity and its popular generalization $f(T)$ gravity can be formulated as fully invariant (under both coordinate transformations and local Lorentz transformations) theories of gravity.
Coley, A. A., Hoogen, RJVD, Boehmer, CG, Pereira, JG, Pereira, J. G. [UNESP], van den Hoogen, R. J., Krssak, M., Coley, AA, Krssak, M, Bohmer, C. G.   +9 more
core   +1 more source

Two-dimensional models of quantum field theory and quantum gravity

, 2022
We study two-dimensional models of quantum gravity from different perspectives. In the first half, we study a class of toy models that are meant to understand gravitational path integrals in low dimensions. Our work will lead to a new construction in two-

core   +1 more source

Speckle Skin‐Based Multimodal Tactile Perception for Fine Robotic Manipulation

Advanced Intelligent Systems, EarlyView.
SpeckleTac, a miniature vision‐based tactile sensor, utilizes a speckle‐pattern skin and optical flow‐based scalable virtual marker tracking. Combined with advanced algorithms, it achieves high‐resolution 3D surface reconstruction, precise contact perception, and stable grasping capabilities.
Jiayuan Zhang, Chong Wang, Yingao Xu, Shihan Wang, Houping Wu, Yulian Peng, Hongbo Wang   +6 more
wiley   +1 more source

Sachs’ free data in real connection variables

Journal of High Energy Physics, 2017
We discuss the Hamiltonian dynamics of general relativity with real connection variables on a null foliation, and use the Newman-Penrose formalism to shed light on the geometric meaning of the various constraints.
Elena De Paoli, Simone Speziale
doaj   +1 more source

Quantum-gravity-slingshot: orbital precession due to the modified uncertainty principle, from analogs to tests of Planckian physics with quantum fluids

, 2018
Modified uncertainty principle and non-commutative variables may phenomenologically account for quantum gravity effects, independently of the considered theory of quantum gravity.
Claudio Conti (250294), Giulia Marcucci (14361417)   +1 more
core   +1 more source

ParamNet: A Physics‐Guided Deep Learning Framework for Intelligent Self‐Inversion of Vacuum Optical Levitation Systems

Advanced Intelligent Systems, EarlyView.
A physics‐guided deep learning framework, ParamNet, is introduced for the intelligent self‐inversion of vacuum optical tweezers. By fuzing dual‐branch time–frequency features with physical dynamical constraints, it achieves high‐accuracy calibration of trap parameters from short‐window, low‐frequency trajectories, outperforming traditional methods ...
Qi Zheng, Wenfeng Fan, Feng Li, Jian Wu, Wei Quan   +4 more
wiley   +1 more source

Universal spacetimes in four dimensions

Journal of High Energy Physics, 2017
Universal spacetimes are exact solutions to all higher-order theories of gravity. We study these spacetimes in four dimensions and provide necessary and sufficient conditions for universality for all Petrov types except of type II.
S. Hervik, V. Pravda, A. Pravdová
doaj   +1 more source

Response to Pashby: Time operators and POVM observables in quantum mechanics [PDF]

, 2013
I argue against a general time observable in quantum mechanics except for quantum gravity theory. Then I argue in support of case specific arrival time and dwell time observables with a cautionary note concerning the broad approach to POVM observables ...
Fleming, Gordon N.
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