Results 111 to 120 of about 5,789 (259)

Contact Force Estimation in Human–Robot Collaboration: A Case Study on Heavyweight Robotic Manipulators

Advanced Intelligent Systems, EarlyView.
The method presented in this paper provides a practical sensorless solution for estimating both contact force and contact location using only standard joint encoders and an available robot dynamic model. By reformulating the contact estimation problem using a single scalar equivalent contact parameter, the approach enables fast and robust computation ...
Thanh‐Quan Ta, Shyh‐Leh Chen
wiley   +1 more source

Ising model coupled to three-dimensional quantum gravity [PDF]

Physical Review D, 1992
11 ...
openaire   +3 more sources

Stochastic Locomotion Emerging From Body–Environment Interactions in a Mexican Jumping Bean–Inspired Robot

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, Alessio Mondini, Edoardo Sinibaldi, Barbara Mazzolai   +3 more
wiley   +1 more source

Phases of tree-decorated Dynamical Triangulations in 3D

Journal of High Energy Physics
This work revisits the Euclidean Dynamical Triangulation (DT) approach to non-perturbative quantum gravity in three dimensions. Inspired by a recent combinatorial study [1] of a subclass of 3-sphere triangulations constructed from trees, called the ...
Timothy Budd, Dániel Németh
doaj   +1 more source

Branes in JT (super)gravity from group theory

Journal of High Energy Physics
In this work, we revisit the end-of-the-world (EOW) brane amplitudes in JT gravity from a BF gauge theoretic perspective. Observing and identifying the correct group theoretic ingredient for a closed EOW brane as a discrete series character, we use the ...
Andreas Belaey, Francesca Mariani, Thomas G. Mertens   +2 more
doaj   +1 more source

Scalarization of compact stars in the scalar-Gauss-Bonnet gravity

Journal of High Energy Physics, 2019
We study scalarization of horizonless neutral compact reflecting stars. In our model, the scalar hair can be induced by the coupling of static scalar fields to the Gauss-Bonnet invariant.
Yan Peng
doaj   +1 more source

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 ...
openaire   +2 more sources

Spontaneous collapse models lead to the emergence of classicality of the Universe

Journal of High Energy Physics
Assuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry.
José Luis Gaona-Reyes, Lucía Menéndez-Pidal, Mir Faizal, Matteo Carlesso   +3 more
doaj   +1 more source

Emergent time and more from wavefunction collapse in general relativity

Journal of High Energy Physics
In this paper, we further develop a recently proposed theory of time based on wavefunction collapse in general relativity. It is based on the postulations that quantum states, which violate the momentum and Hamiltonian constraints, represent instances of
Sung-Sik Lee
doaj   +1 more source

Testing quantum gravity with primordial gravitational waves

Journal of High Energy Physics
We propose a testable alternative to inflation directly built in a very general class of ultraviolet complete theories of quantum gravity enjoying Weyl invariance.
Gianluca Calcagni, Leonardo Modesto
doaj   +1 more source