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Articles 421 - 422 of 422
Full-Text Articles in Astrophysics and Astronomy
Dilaton Black Holes With Electric Charge, Malik Rakhmanov
Dilaton Black Holes With Electric Charge, Malik Rakhmanov
Physics and Astronomy Faculty Publications and Presentations
New static spherically symmetric solutions of the Einstein-Maxwell gravity with the dilaton field are found. The solutions correspond to black holes and naked singularities. In addition to mass and electric charge these solutions are labeled by a new parameter, the dilaton charge of the black hole. Depending on the values of electric and dilaton charges there are different types of solutions. The solutions exhibit a new type of a symmetry. Namely one solution transforms into another when the mass and the dilaton charge are interchanged. We also found that there is a finite interval of values of electric charge for …
Second-Order Parametrized-Post-Newtonian Lagrangian, Matthew J. Benacquista
Second-Order Parametrized-Post-Newtonian Lagrangian, Matthew J. Benacquista
Physics and Astronomy Faculty Publications and Presentations
A many-body Lagrangian to second post-Newtonian order using an extension of the parametrized-post-Newtonian (PPN) formalism is introduced and the properties of new parameters are explored. A parametrized gauge transformation is developed to permit comparison with theories of gravity in a variety of different coordinate systems. A procedure to impose Lorentz invariance on a general second-order post-Newtonian Lagrangian is developed. The Lagrangian is then constrained to possess Lorentz invariance and a "Lorentz-invariant" gauge is introduced. The constrained Lagrangian is found to be described by ten new second-order PPN parameters. When the Lagrangian is further constrained to describe theories of gravity for …