Results 71 to 80 of about 32,545 (270)
Study of the Inflationary Spectrum in the Presence of Quantum Gravity Corrections
Universe, 2023 After a brief review of the different approaches to predicting the possible quantum gravity corrections to quantum field theory, we discuss in some detail the formulation based on a Gaussian reference frame fixing.
Giulia Maniccia +2 more
doaj +1 more source
Two-point correlation function of density perturbations in a large void universe
, 2013 We study the two-point correlation function of density perturbations in a spherically symmetric void universe model which does not employ the Copernican principle.
Nakao, Ken-ichi +2 more
core +3 more sources
Inhomogeneous Universe Models with Varying Cosmological Term [PDF]
General Relativity and Gravitation, 1998 The evolution of a class of inhomogeneous spherically symmetric universe models possessing a varying cosmological term and a material fluid, with an adiabatic index either constant or not, is studied.
Chimento, Luis P., Pavón, Diego
openaire +3 more sources
Advanced Functional Materials, EarlyView.This study examines how pore shape and manufacturing‐induced deviations affect the mechanical properties of 3D‐printed lattice materials with constant porosity. Combining µ‐CT analysis, FEM, and compression testing, the authors show that structural imperfections reduce stiffness and strength, while bulk material inhomogeneities probably enhance ...
Oliver Walker +5 more
wiley +1 more source
Kerr-NUT-de Sitter as an inhomogeneous non-singular bouncing cosmology
Journal of High Energy Physics, 2019 We present exact non-singular bounce solutions of general relativity in the presence of a positive cosmological constant and an electromagnetic field, without any exotic matter.
Andrés Anabalón +2 more
doaj +1 more source
Advanced Functional Materials, EarlyView.This review explores functional and responsive materials for triboelectric nanogenerators (TENGs) in sustainable smart agriculture. It examines how particulate contamination and dirt affect charge transfer and efficiency. Environmental challenges and strategies to enhance durability and responsiveness are outlined, including active functional layers ...
Rafael R. A. Silva +9 more
wiley +1 more source
Anisotropic stresses in inhomogeneous universes
Physical Review D, 1998 Anisotropic stress contributions to the gravitational field can arise from magnetic fields, collisionless relativistic particles, hydrodynamic shear viscosity, gravitational waves, skew axion fields in low-energy string cosmologies, or topological defects.
Barrow, J. D., Maartens, Roy
openaire +2 more sources
SOLVING THE INVERSE PROBLEM WITH INHOMOGENEOUS UNIVERSES [PDF]
International Journal of Modern Physics: Conference Series, 2008 We construct the Lemaître-Tolman-Bondi (LTB) dust universe whose distance-redshift relation is equivalent to that in the concordance Λ cold dark matter (ΛCDM) cosmological model. In our model, the density distribution and velocity field are not homogeneous, whereas the big-bang time is uniform, which implies that the universe is homogeneous at its ...
Yoo, Chul-Moon +2 more
openaire +3 more sources
MOFs and COFs in Electronics: Bridging the Gap between Intrinsic Properties and Measured Performance
Advanced Functional Materials, EarlyView.Metal‐organic frameworks (MOFs) and covalent organic frameworks (COFs) hold promise for advanced electronics. However, discrepancies in reported electrical conductivities highlight the importance of measurement methodologies. This review explores intrinsic charge transport mechanisms and extrinsic factors influencing performance, and critically ...
Jonas F. Pöhls, R. Thomas Weitz
wiley +1 more source
Entropy, 2016 The present work deals with the semi-classical tunnelling approach and the Hamilton–Jacobi method to study Hawking radiation from the dynamical horizon of both the homogeneous Friedmann–Robertson–Walker (FRW) model and the inhomogeneous Lemaitre–Tolman ...
Subenoy Chakraborty +2 more
doaj +1 more source