Results 51 to 60 of about 2,648,408 (181)
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
A Wheeler–DeWitt Quantum Approach to the Branch-Cut Gravitation with Ordering Parameters
Universe, 2023 In this contribution to the Festschrift for Prof. Remo Ruffini, we investigate a formulation of quantum gravity using the Hořava–Lifshitz theory of gravity, which is General Relativity augmented by counter-terms to render the theory regularized.
Benno August Ludwig Bodmann +6 more
doaj +1 more source
On the Green's function and iterative solutions of Loop Quantum Cosmology [PDF]
Gen.Rel.Grav. 38 (2006) 1387-1396, 2006 Here we shall find the green's function of the difference equation of loop quantum cosmology. To illustrate how to use it, we shall obtain an iterative solution for closed model and evaluate its corresponding Bohmian trajectory.
arxiv +1 more source
Stellar Physics and General Relativity
Astronomische Nachrichten, EarlyView.ABSTRACT The general theory of relativity is currently established as the most precise theory of gravity supported by observations, and its application is diverse ranging from astronomy to cosmology, while its application to astrophysics has been restricted only to compact stars due to the assumption that the Newtonian approximation is sufficient for ...
Shuichi Yokoyama
wiley +1 more source
Noncommutative Quantum Cosmology [PDF]
Gen.Rel.Grav. 37 (2005) 817-821, 2004 We consider noncommutative quantum cosmology in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.The Noncommutative quantum cosmology is considered in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.
arxiv +1 more source
Cosmological Dynamics of Interacting Dark Energy and Dark Matter in f(Q)$f(Q)$ Gravity
Fortschritte der Physik, EarlyView.Abstract In this work, the behavior of interacting dark energy (DE) and dark matter (DM) within a model of f(Q)$f(Q)$ gravity is explored, employing the standard framework of dynamical system analysis. The power‐law f(Q)$f(Q)$ model is considered, incorporating two different forms of interacting DE and DM: 3αHρm$3\alpha H\rho _m$ and α3HρmρDE$\frac ...
Gaurav N. Gadbail +3 more
wiley +1 more source
General relativity and cosmology [PDF]
International Journal of Modern Physics D Vol. 24, No. 14 (2015)
1530030 (15 pages), 2015 This year marks the hundredth anniversary of Einstein's 1915 landmark paper "Die Feldgleichungen der Gravitation" in which the field equations of general relativity were correctly formulated for the first time, thus rendering general relativity a complete theory.
arxiv +1 more source
Dark Dimension With (Little) Strings Attached
Fortschritte der Physik, EarlyView.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
On quantizing gravity and geometrizing quantum mechanics
Iranian Journal of Physics Research, 2005 We elaborate on some recent results on a solution of the Hilbert-space problem in minisuperspace quantum cosmology and discuss the consequences of making the (geometry of the) Hilbert space of ordinary nonrelativistic quantum systems time-dependent.
Ali Mostafazadeh
doaj
Anthropology of Consciousness, EarlyView.Abstract Within recent years, an increasing number of people and researchers in the Global North have become interested in psychedelic substances and their therapeutic application. While much of the current media attention and research effort mainly concentrate on the therapeutic potential and actions of the individual's acute psychedelic experience ...
Sidsel Marie
wiley +1 more source