Results 91 to 100 of about 37,871 (243)
Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond
Advanced Physics Research, Volume 4, Issue 5, May 2025.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
Mathematical Structure of Loop Quantum Cosmology: Homogeneous Models
Symmetry, Integrability and Geometry: Methods and Applications, 2013 The mathematical structure of homogeneous loop quantum cosmology is analyzed, starting with and taking into account the general classification of homogeneous connections not restricted to be Abelian.
Martin Bojowald
doaj +1 more source
On the Hamiltonian Constraint of Loop Quantum Cosmology
, 2005 In this paper we construct the Hamiltonian constraint operator of loop quantum cosmology using holonomies defined for arbitrary irreducible SU(2) representations labeled by spin J.
A. Ashtekar +5 more
core +1 more source
Dark Dimension With (Little) Strings Attached
Fortschritte der Physik, Volume 73, Issue 4, April 2025.Abstract A relation between dark energy and the scale of new physics in weakly coupled string theory is motivated. This mixing between infrared and ultraviolet physics leads to a unique corner for real‐world phenomenology: barring fine‐tunings, the authors are naturally led to the “dark dimension” scenario, a single mesoscopic extra dimension of micron
Ivano Basile, Dieter Lüst
wiley +1 more source
Dynamical behavior of interacting dark energy in loop quantum cosmology
, 2010 The dynamical behaviors of interacting dark energy in loop quantum cosmology are discussed in this paper. Based on defining three dimensionless variables, we simplify the equations of the fixed points.
Chen X.-M. +5 more
core +1 more source
Foundations of Ghost Stability
Fortschritte der Physik, Volume 73, Issue 4, April 2025.Abstract The authors present a new method to analytically prove global stability in ghost‐ridden dynamical systems. The proposal encompasses all prior results and consequentially extends them. In particular, it is shown that stability can follow from a conserved quantity that is unbounded from below, contrary to expectation.
Verónica Errasti Díez +2 more
wiley +1 more source
Nonlinear (loop) quantum cosmology
Physical Review D, 2012 Inhomogeneous quantum cosmology is modeled as a dynamical system of discrete patches, whose interacting many-body equations can be mapped to a non-linear minisuperspace equation by methods analogous to Bose-Einstein condensation. Complicated gravitational dynamics can therefore be described by more-manageable equations for finitely many degrees of ...
David Simpson +4 more
openaire +4 more sources
Probability of inflation in loop quantum cosmology [PDF]
General Relativity and Gravitation, 2011 34 pages, 3 ...
David Sloan, David Sloan, Abhay Ashtekar
openaire +5 more sources
Numerical Techniques in Loop Quantum Cosmology
Symmetry, Integrability and Geometry: Methods and Applications, 2012 In this article, we review the use of numerical techniques to obtain solutions for the quantum Hamiltonian constraint in loop quantum cosmology (LQC).
David Brizuela +2 more
doaj +1 more source
Loop quantum cosmology with a non-commutative quantum deformed photon gas
European Physical Journal C: Particles and Fields, 2018 The non-commutativity of the space-time had important implications for the very early Universe, when its size was of the order of the Planck length. An important implication of this effect is the deformation of the standard dispersion relation of special
Yunxin Ye, Tiberiu Harko, Shi-Dong Liang
doaj +1 more source