These homogeneous spacetimes can be regarded as generalization of maximally symmetric spacetimes dropping the assumption of the existence of a nondegenerate tangent space metric. The resulting CS theories are consequently gravitational theories that may not allow for a description in terms of a metric,...
Non-gravitational interactionsIn this work we study a one-parameter family of differential equations and the different scenarios that arise with the change of parameter. We remark that these are not bifurcations in the usual sense but a wider phenomenon related with changes of continuity or ...
The Promise of Gravitational Lensing “Roman is the ideal tool to let the study of gravitationally lensed supernovae take off,” said Lou Strolger of theSpace Telescope Science Institute(STScI) in Baltimore, co-lead of the team preparing for Roman’s study of these objects. “They are rare,...
In the present work we analize the behavior of 5-dimensional gravitational waves propagating on a Kaluza-Klein background and we face separately the two ca... Alesci, Emanuele,Montani, Giovanni 被引量: 0发表: 2004年 The relaxed linear micromorphic continuum: well-posedness of the static proble...
State the dimensions and SI unit of force constant k. View Solution Define gravitational constant. State its SI unit. View Solution Define surface tension. State its units and dimensions. View Solution Define absorptive power, state its unit and dimension. ...
Live loads are also of different types for different structures although mechanically of the same nature which is to cause stress. For example, live loads for building structures are primarily vertical gravitational force of the occupants while for bridge structures they are primarily traffic loads, ...
Time variation of Newtonian gravitational constant, $G$, is studied in the model universe with variable space dimension proposed recently. Using the Lagrangian formulation of these models, we find the effective gravitaional constant as a function of time. To compare it with observational data, a ...
“Maybe this is the dark matter?” Vafa mused. The gravitons they had concocted were, after all, weakly interacting yet capable of mustering some gravitational heft. One merit of the idea, he noted, is that gravitons have been a part of physics for 90 years, having been first proposed...
A difficulty with the acceptance of these ideas at the time was a lack of both experimental implications and a quantum description of gravitational dynamics. Today, one of the most striking requirements of modern string theory, which incorporates both gauge theories and gravitation, is that there ...
The scheme utilizes a hybrid meta-heuristic optimization algorithm: Particle Swarm Optimization and Gravitational Search Algorithm-Explore (PSOGSA-E) to optimize node transmit weights. In [18], sidelobe minimization in CB through node position perturbation is proposed. The authors propose a multi-...