Results 121 to 130 of about 166,017,541 (302)
Revisiting loop quantum gravity with selfdual variables: classical theory
Classical and Quantum GravityAbstract We review the classical formulation of general relativity as an S L ( 2 ,
Hanno Sahlmann, Robert Seeger
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Classical aspects of higher spin topologically massive gravity
, 2012 We study the classical solutions of three-dimensional topologically massive gravity (TMG) and its higher spin generalization, in the first-order formulation. The action of higher spin TMG has been proposed by Chen and Long (2011 J.
Zhang, Jian-Dong, Long, Jiang, Chen, Bin
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Micro/Nanoscale Acoustic Manipulation: From Particle Control to Autonomous Microswimmers
Advanced Science, EarlyView.This conceptual framework illustrates acoustic technology as a multifunctional platform enabling passive particle manipulation across scales and autonomous propulsion of microswimmers. ABSTRACT Acoustic manipulation and propulsion technologies have emerged as powerful platforms for micro/nanoscale control, enabled by their non‐contact operation, label ...
Jiahui Chu +4 more
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Scattering Amplitude Techniques in Classical Gauge Theories and Gravity
, 2022 PhD ...
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Bioinspired Metastable Transient Peeling for Repeatable Rapid Release
Advanced Science, EarlyView.Inspired by the explosive seed ejection of the squirting cucumber, this work introduces metastable transient peeling that temporally regulates stored interfacial energy release via a tunable energy barrier. A viscoelastic hemispherical gripper achieves 52 ms ultrafast, residue‐free release with 300 000‐cycle durability, enabling damage‐free handling of
Lvzhou Li +8 more
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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
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Engineering a Correlated Narrow‐Gap Semiconductor: Effects of Ga Substitution in EuZn2P2
Advanced Electronic Materials, EarlyView.ABSTRACT The effect of Ga substitution on the electronic, magnetic, and low‐energy responses of the Zintl phase EuZn2P2${\rm EuZn}_2 {\rm P}_2$ is investigated by electrical transport, electron spin resonance (ESR), and terahertz time‐domain spectroscopy (THz‐TDS). Incorporating Ga into EuZn2P2${\rm EuZn}_2 {\rm P}_2$ (EuZn1.8Ga0.2P2${\rm EuZn}_{1.8} {\
Mateus Dutra +13 more
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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
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Agribusiness, EarlyView.ABSTRACT Since the final decade of the 20th century, Latin American countries have increasingly regarded the signing of regional trade agreements (RTAs) as a promising strategy for expanding their exports. Within this context, the main objective of this study is to assess the impact of RTAs on agri‐food exports in Latin America over the period 1990 ...
María‐Isabel Ayuda +2 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
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