Results 161 to 170 of about 178,240 (316)

Generalized Task‐Driven Design of Soft Robots via Reduced‐Order Finite Element Method‐Based Surrogate Modeling

Advanced Intelligent Systems, EarlyView.
A unified, reusable modeling pipeline enables task‐driven design of soft robots across actuator families and task scenarios. High‐fidelity simulations are compressed into compact pseudo‐rigid‐body joint surrogates, while a design‐conditioned meta‐model generates new surrogates from geometry parameters without rerunning finite element method.
Yao Yao, David Howard, Perla Maiolino
wiley   +1 more source

Gravity as BF theory plus potential

, 2009
Spin foam models of quantum gravity are based on Plebanski's formulation of general relativity as a constrained BF theory. We give an alternative formulation of gravity as BF theory plus a certain potential term for the B-field.
Krasnov, Kirill
core   +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

Ghost-free infinite derivative gravity

Journal of High Energy Physics, 2018
We present the construction of a gravitational action including an infinite series of higher derivative terms. The outcome is a classically consistent completion of a well-studied quadratic curvature theory.
Brage Gording, Angnis Schmidt-May
doaj   +1 more source

Quantum spacetime and the renormalization group: Progress and visions

, 2019
The quest for a consistent theory which describes the quantum microstructure of spacetime seems to require some departure from the paradigms that have been followed in the construction of quantum theories for the other fundamental interactions.
D Oriti, J Frohlich, KS Stelle, M Gell-Mann, MH Goroff   +4 more
core   +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

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

Work Versus Force: Simultaneous Processes for Describing Interactions

Advanced Physics Research, EarlyView.
ABSTRACT Achieving a unified description of interactions remains an open challenge in theoretical physics, which currently describes four fundamental forces. This situation may be viewed differently when interactions are formulated in terms of processes (work as actio) rather than forces (force as actio), not only at the macroscopic level but also at ...
Grit Kalies, Duong D. Do, Cornelia Breitkopf   +2 more
wiley   +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

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