Results 11 to 20 of about 500,941 (94)
Cosmological dark energy effects from entanglement [PDF]
Physics Letters A 377 (2013) 1061-1064, 2013 The thorny issue of relating information theory to cosmology is here addressed by assuming a possible connection between quantum entanglement measures and observable universe. In particular, we propose a cosmological toy model, where the equation of state of the cosmological fluid, which drives the today observed cosmic acceleration, can be inferred ...
arxiv +1 more source
Te Vacancy‐Driven Anomalous Transport in ZrTe5 and HfTe5
Advanced Physics Research, EarlyView.Less is more! Recent discoveries in topological quantum materials have rekindled excitement for direct observation of quantum anomalies in a condensed matter physics laboratory, which is historically intractable in particle and cosmological physics. Using atomistic modeling this study sheds light on the source of the anomalous transport properties that
Elizabeth A. Peterson +2 more
wiley +1 more source
Cosmology models with Ω_M-dependent cosmological constant [PDF]
Gen.Rel.Grav. 35 (2003) 1007-1016, 2002 We investigate the evolution of the scale factor in a cosmological model in which the cosmological constant is given by the scalar arisen by the contraction of the stress-energy tensor.
arxiv +1 more source
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
On the cosmological gravitational waves and cosmological distances [PDF]
Physics Letters B 778 (2018) 332, 2017 We show that solitonic cosmological gravitational waves propagated through the Friedmann universe and generated by the inhomogeneities of the gravitational field near the Big Bang can be responsible for increase of cosmological distances.
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
Some conceptual issues in loop quantum cosmology [PDF]
, 2016 Loop quantum gravity is a mature theory. To proceed to explicit calculations in cosmology, it is necessary to make assumptions and simplifications based on the symmetries of the cosmological setting. Symmetry reduction is especially critical when dealing with cosmological perturbations.
arxiv +1 more source
Cosmological constant in spinfoam cosmology [PDF]
Phys.Rev.D83:104015,2011, 2011 We consider a simple modification of the amplitude defining the dynamics of loop quantum gravity, corresponding to the introduction of the cosmological constant, and possibly related to the SL(2,C)q extension of the theory recently considered by Fairbairn-Meusburger and Han.
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
Causal loop quantum cosmology in momentum space [PDF]
Int.J.Mod.Phys.D18:83-93,2009, 2007 We shall show that it is possible to make a causal interpretation of loop quantum cosmology using the momentum as the dynamical variable. We shall show that one can derive Bohmian trajectories. For a sample cosmological solution with cosmological constant, the trajectory is plotted.
arxiv +1 more source