Results 61 to 70 of about 338,762 (168)
The generalized virial theorem in f(R) gravity
, 2008 We generalize the virial theorem in f(R) modified gravity using the collisionless Boltzmann equation. We find supplementary geometric terms in the modified Einstein equation providing an effective contribution to the gravitational energy.
Harko, T, Lobo, FSN, Böhmer, CG
core +1 more source
Understanding Electronic Structure and Chemical Reactivity: Quantum-Information Perspective
Applied Sciences, 2019 Several applications of quantum mechanics and information theory to chemical reactivity problems are presented with emphasis on equivalence of variational principles for the constrained minima of the system electronic energy and its kinetic energy ...
Roman F. Nalewajski
doaj +1 more source
The introduction of baryon string in the model of spiral galaxies structure [PDF]
Компьютерные исследования и моделирование, 2012 It proposes a new alternative approach to explain the flat spectrum of the velocity for stars orbital motion on the periphery of spiral galaxies. In particular, that velocity significant excess of speed calculated according to the virial theorem.
A. V. Koganov, Vladimir G. Krechet
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Exploring Routes to Calculating the Effective Magnetic Permeability of Polymer Magnetic Composites
Polymer Composites, Volume 47, Issue 2, Page 981-988, 20 January 2026.Schematic of a static (undeformed) configuration of the magnetic‐filled polymer network for a semi‐crystalline sample. ABSTRACT Our understanding of the effective magnetic permeability of composite materials composed of randomly dispersed metallic ferromagnetic particles within a nonmagnetic (polymer) matrix must respond to several challenges.
Christian Brosseau
wiley +1 more source
On the generalized virial theorem for systems with variable mass
, 2016 International audienceWe presently extend the virial theorem for both discrete and continuous systems of material points with variable mass, relying on developments presented in Ganghoffer (Int J Solids Struct 47:1209―1220, 2010). The developed framework
Ganghoffer, Jean-François +1 more
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Statistical Gravity Through Affine Quantization
Quantum ReportsI propose a possible way to introduce the effect of temperature (defined through the virial theorem) into Einstein’s theory of general relativity. This requires the computation of a path integral on a ten-dimensional flat space in a four-dimensional ...
Riccardo Fantoni
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Advances in High Energy Physics, Volume 2026, Issue 1, 2026.This work examines the physical characteristics of charged, anisotropic compact spheres within the framework of f(R, ϕ, X) modified gravity. Starting from a static, spherically symmetric spacetime, we employ an Adler‐type ansatz for the temporal metric component gtt.
Adnan Malik +5 more
wiley +1 more source
An elementary derivation of the quantum virial theorem from Hellmann-Feynman theorem
, 2016 A simple proof of the quantum virial theorem that can be used in undergraduate courses is given. The proof proceeds by first showing that the energy eigenvalues of a Hamiltonian remain invariant under a scale transformation.
Turgut, Sadi, İpekoğlu, Yusuf
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Atomistic simulations of water‐driven structural and mechanical changes in N–A–S–H gels
Journal of the American Ceramic Society, Volume 108, Issue 12, December 2025.Abstract This study employs molecular dynamics simulations to investigate the effect of varying water content (0–25 wt.%) and Si/Al ratio (1–3) on the atomistic structure and elastic properties of sodium aluminosilicate hydrates (N–A–S–H) gels. Results show that water molecules break the aluminosilicate framework by forming hydroxyl groups on AlO4 and ...
Eashow Shamo +4 more
wiley +1 more source
Fatigue &Fracture of Engineering Materials &Structures, Volume 48, Issue 11, Page 4769-4783, November 2025.ABSTRACT At the near‐threshold regime, small irregularities on the surface can interact with the microstructure and affect the nucleation and propagation of cracks. Molecular dynamics is an effective methodology to investigate the damage evolution at this scale, and three types of defects, namely, triangular, rectangular, and crack, are examined.
Francesco Gucci +3 more
wiley +1 more source