Results 101 to 110 of about 576,868 (362)
, 2003 A generalized version of the Einstein equations in the 4-index form, containing the Riemann tensor linearly, is derived. It is shown, that the gravitational energy-momentum density tensor outside a source is represented across the Weyl tensor vanishing ...
Zakir, Zahid
core +1 more source
A High Throughput Microfluidic Approach for the Continuous Manufacture of Ibuprofen Nanocrystals
Advanced Materials Technologies, EarlyView.A robust, continuous manufacturing platform using a high‐throughput microfluidic reactor addresses key scalability challenges in pharmaceutical production. This process efficiently generates crystalline ibuprofen nanoparticles with superior control over size and distribution.
Shorooq Abukhamees +5 more
wiley +1 more source
Some Curvature Conditions on a Para-Sasakian Manifold with Canonical Paracontact Connection
International Journal of Mathematics and Mathematical Sciences, 2012 We study canonical paracontact connection on a para-Sasakian manifold. We prove that a Ricci-flat para-Sasakian manifold with respect to canonical paracontact connection is an η-Einstein manifold.
Bilal Eftal Acet +2 more
doaj +1 more source
Einstein double field equations
European Physical Journal C: Particles and Fields, 2018 Upon treating the whole closed string massless sector as stringy graviton fields, Double Field Theory may evolve into Stringy Gravity, i.e. the stringy augmentation of General Relativity.
Stephen Angus +2 more
doaj +1 more source
Gravitation, electromagnetism and cosmological constant in purely affine gravity
, 2009 The Ferraris-Kijowski purely affine Lagrangian for the electromagnetic field, that has the form of the Maxwell Lagrangian with the metric tensor replaced by the symmetrized Ricci tensor, is dynamically equivalent to the metric Einstein-Maxwell Lagrangian,
A. Coley +51 more
core +1 more source
Quantum Equivalence of $f(R)$ Gravity and Scalar-tensor Theories in the Jordan and Einstein Frames [PDF]
, 2017 The $f(R)$ gravity and scalar-tensor theory are known to be equivalent at the classical level. We study if this equivalence is valid at the quantum level. There are two descriptions of the scalar-tensor theory in the Jordan and Einstein frames.
N. Ohta
semanticscholar +1 more source
Probing Ultrafast Coherent Bandgap Modulation in Monolayer WSe2 by Nonlinear Optics
Advanced Optical Materials, EarlyView.This work sheds light on how resonant nonlinear optics blursthe line between perturbative and non‐perturbative nonlinear optics. Measured deviationsfrom the quadratic second‐harmonic scaling near the excitonic resonance arisefrom optical Stark and Bloch‐Siegert shifts. The experimental results arefurther underpinned by analytical and numerical analysis
Sebastian Klimmer +7 more
wiley +1 more source
The Impact of Quasi-Conformal Curvature Tensor on Warped Product Manifolds
AxiomsThis work investigates the effects on the factor manifolds of a singly warped product manifold resulting from the presence of a quasi-conformally flat, quasi-conformally symmetric, or divergence-free quasi-conformal curvature tensor.
Bang-Yen Chen +4 more
doaj +1 more source
On the structure of the new electromagnetic conservation laws
, 2003 New electromagnetic conservation laws have recently been proposed: in the absence of electromagnetic currents, the trace of the Chevreton superenergy tensor, $H_{ab}$ is divergence-free in four-dimensional (a) Einstein spacetimes for test fields, (b ...
Andersson F +17 more
core +1 more source