Results 101 to 110 of about 624,114 (277)
Data‐Driven Review on Aerogels and Polymeric Aerogels
Angewandte Chemie International Edition, Accepted Article.Thoroughly data‐driven review on chemistry–properties–applications of aerogels is provided. Aerogel is a category of solid materials having homogeneous, highly porous nanostructures. Unique physicochemical properties of aerogels have attracted much attention in wide fields due to their potentials for energy/environmental issues in the 21st century ...
Satoru Takeshita +2 more
wiley +1 more source
Hysteresis and beating phenomena in loop quantum cosmology [PDF]
Physical Review D, 2019 Differences in pressure during expansion and contraction stages in cosmic evolution can result in a hysteresis-like phenomena in non-singular cyclic models sourced with scalar fields.
J. Dupuy, Parampreet Singh
semanticscholar +1 more source
Loop quantum cosmology and inhomogeneities [PDF]
General Relativity and Gravitation, 2006 Inhomogeneities are introduced in loop quantum cosmology using regular lattice states, with a kinematical arena similar to that in homogeneous models considered earlier. The framework is intended to encapsulate crucial features of background independent quantizations in a setting accessible to explicit calculations of perturbations on a cosmological ...
openaire +3 more sources
Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond
Advanced Physics Research, EarlyView.Singular electromagnetics/optics studies multidimensional topological defects of electromagnetic fields (also known as optical singularities), including phase and polarization singularities, 3D singularities (e.g., optical skyrmions, merons, hopfions, knots, links, and Möbius strips), and even higher‐dimensional singularities.
Jie Yang +3 more
wiley +1 more source
Loop quantum cosmology from an alternative Hamiltonian [PDF]
Physical Review D, 2019 In this paper, a new Hamiltonian constraint operator for loop quantum cosmology is constructed by using the Chern-Simons action. The quantum dynamics of the $k=0$ cosmological model with respect to a massless scalar field as an emergent time is ...
Jinsong Yang, Cong Zhang, Yongge Ma
semanticscholar +1 more source
Phenomenological implications of an alternative Hamiltonian constraint for quantum cosmology
, 2005 In this paper we review a model based on loop quantum cosmology that arises from a symmetry reduction of the self dual Plebanski action. In this formulation the symmetry reduction leads to a very simple Hamiltonian constraint that can be quantized ...
A. Ashtekar +6 more
core +1 more source
On solutions of loop quantum cosmology [PDF]
The European Physical Journal C, 2013 Loop quantum cosmology is considered in inflation era. A slow roll scalar field solution with power law potential is presented in the neighborhood of transition time, i.e. when the universe enters inflation phase from super-inflation. The compatibility of the model with Planck 2013 data is discussed. The domain of validity of second and the generalized
openaire +3 more sources
The mass of cosmological perturbations in Loop Quantum Cosmology
The Fifteenth Marcel Grossmann Meeting, 2022 Sixth Tux workshop on Quantum Gravity. Monday, February 19 to Friday, February 23. Tux, Austria (2018). ..-https://www.gravity.physik.fau.de/events/tux6/
Mena Marugán, Guillermo A. +2 more
openaire +2 more sources
Tachyonic inflation in loop quantum cosmology
European Physical Journal C: Particles and Fields, 2019 A tachyon field might be responsible for cosmological inflation at an early time and contribute to cosmological dark matter at a later time. We investigate tachyonic inflation by analyzing a tachyon field with different potentials in the framework of ...
Kui Xiao
doaj +1 more source
Thermodynamics in new model of loop quantum cosmology
European Physical Journal C: Particles and Fields, 2021 The thermodynamic properties of loop quantum cosmology (LQC) without considering the Lorentz term were established in Li and Zhu (Adv High Energy Phys 2009:905705, 2009).
Xiangdong Zhang
doaj +1 more source