Results 61 to 70 of about 576,868 (362)

Gauge symmetry of linearised Nordström gravity and the dual spin two field theory

European Physical Journal C: Particles and Fields, 2022
The field equations are proposed for the third rank tensor field with the hook Young diagram. The equations describe the irreducible spin two massless representation in any $$d\ge 3$$ d ≥ 3 .
Victoria Abakumova, Daniel Frolovsky, Hans-Christian Herbig, Simon Lyakhovich   +3 more
doaj   +1 more source

Metrics With Vanishing Quantum Corrections

, 2008
We investigate solutions of the classical Einstein or supergravity equations that solve any set of quantum corrected Einstein equations in which the Einstein tensor plus a multiple of the metric is equated to a symmetric conserved tensor $T_{\mu \nu ...
A A Coley, Bleecker D, C N Pope, Coley A, Coley A, Coley A, Coley A, Coley A, Coley A, Coley A Fuster A Hervik S, Deser S, G W Gibbons, Ghanam R, Gibbons G W, Gibbons G W, Hervik S, Lü H, Lü H, Lü H, Pravda V, Pravda V, S Hervik   +21 more
core   +1 more source

Compact conformally Kahler Einstein-Weyl manifolds [PDF]

, 2012
We give a classification of compact conformally Kahler Einstein-Weyl manifolds whose Ricci tensor is hermitian.Comment: 11 ...
A. Besse, A. Derdziński, A. Derdziński, A. Derdziński, A. Gray, A. Lichnerowicz, H. Pedersen, H. Pedersen, J. Wang, K.P. Tod, L. Bérard Bergery, P. Gauduchon, S. Kobayashi, W. Jelonek, W. Jelonek, Włodzimierz Jelonek   +15 more
core   +2 more sources

Synchrotron Radiation for Quantum Technology

Advanced Functional Materials, EarlyView.
Materials and interfaces underpin quantum technologies, with synchrotron and FEL methods key to understanding and optimizing them. Advances span superconducting and semiconducting qubits, 2D materials, and topological systems, where strain, defects, and interfaces govern performance.
Oliver Rader, Sakura Pascarelli, Klaus Attenkofer, Anna A. Makarova, Karsten Holldack, Kai Rossnagel, Kristiaan Temst, George Kourousias, Stefano Carretta, Caterina Biscari, Helmut Dosch   +10 more
wiley   +1 more source

Patterning the Void: Combining L‐Systems with Archimedean Tessellations as a Perspective for Tissue Engineering Scaffolds

Advanced Functional Materials, EarlyView.
This study introduces a novel multi‐scale scaffold design using L‐fractals arranged in Archimedean tessellations for tissue regeneration. Despite similar porosity, tiles display vastly different tensile responses (1–100 MPa) and deformation modes. In vitro experiments with hMSCs show geometry‐dependent growth and activity. Over 55 000 tile combinations
Maria Kalogeropoulou, Kenny A. van Kampen, Pierpaolo Fucile, Carlos Mota, Lorenzo Moroni   +4 more
wiley   +1 more source

Conformally Flat Pseudoprojective Symmetric Spacetimes in fR,G Gravity

Advances in Mathematical Physics, 2022
Sufficient conditions on a pseudoprojective symmetric spacetime  PPSn whose Ricci tensor is of Codazzi type to be either a perfect fluid or Einstein spacetime are given.
Uday Chand De, Sameh Shenawy, Abdallah Abdelhameed Syied, Nasser Bin Turki   +3 more
doaj   +1 more source

On the stability of Einstein manifolds

, 2014
Certain curvature conditions for stability of Einstein manifolds with respect to the Einstein-Hilbert action are given. These conditions are given in terms of quantities involving the Weyl tensor and the Bochner tensor.
Kroencke, Klaus
core   +1 more source

Gauge-invariant Formulation of the Second-order Cosmological Perturbations [PDF]

, 2006
Gauge invariant treatments of the second order cosmological perturbation in a four dimensional homogeneous isotropic universe filled with the perfect fluid are completely formulated without any gauge fixing.
H. Kodama, J. M. Stewart, J. M. Stewart, Kouji Nakamura   +3 more
core   +2 more sources

Golden‐Ratio–Guided Aperiodic Architected Metamaterials with Simultaneously Enhanced Strength and Toughness

Advanced Functional Materials, EarlyView.
Guided by the golden ratio, a class of aperiodic architected metamaterials is introduced to address the intrinsic trade‐off between strength and toughness. By unifying local geometric heterogeneity with global order, the golden‐ratio‐guided aperiodic architecture promotes spatial delocalization of damage tolerence regions, leading to more tortuous ...
Junjie Deng, Xinxin Wang, Ruochao Zhao, Zhendong Li, Kai Liu, Ke Yuan, Jia An, Xinwei Li, Chee Kai Chua, Zhonggang Wang   +9 more
wiley   +1 more source

Tangent Bundles Endowed with Quarter-Symmetric Non-Metric Connection (QSNMC) in a Lorentzian Para-Sasakian Manifold

Mathematics, 2023
The purpose of the present paper is to study the complete lifts of a QSNMC from an LP-Sasakian manifold to its tangent bundle. The lifts of the curvature tensor, Ricci tensor, projective Ricci tensor, and lifts of Einstein manifold endowed with QSNMC in ...
Rajesh Kumar, Lalnunenga Colney, Samesh Shenawy, Nasser Bin Turki   +3 more
doaj   +1 more source