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Polar modes and isospectrality of Ellis-Bronnikov wormholes
Bahareh Azad, Jose Luis Blázquez-Salcedo, Xiao Yan Chew +2
We consider polar perturbations of static Ellis-Bronnikov wormholes and derive the coupled set of perturbation equations for the gravitational and the scalar field. For massless wo…
Einstein-scalar field solutions in AdS spacetime: clouds, boundary conditions, and scalar multipoles
Dumitru Astefanesei, Hyat Huang, Jutta Kunz +1
We consider an Einstein-scalar field model which is a consistent truncation of gauged supergravity, the scalar field possessing a potential which is unbounded fr…
Robotic observation pipeline for small bodies in the solar system based on open-source software and commercially available telescope hardware
Tobias Hoffmann, Matti Gehlen, Thorsten Plaggenborg +8
The observation of small bodies in the Space Environment is an ongoing important task in astronomy. While nowadays new objects are mostly detected in larger sky surveys, several fo…
Mixed neutron-star-plus-wormhole systems: Rotating configurations
Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus +1
We present rapidly rotating neutron stars featuring wormholes in their centers. They arise in general relativity in the presence of a ghost scalar field. The nuclear matter is desc…
-modes of neutron stars in a massless scalar-tensor theory
Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo +2
Scalar-tensor theories allow for a rich spectrum of quasinormal modes of neutron stars. The presence of the scalar field allows for polar monopole and dipole radiation, as well as…
Quasinormal ringing of regular black holes in asymptotically safe gravity: the importance of overtones
R. A. Konoplya, A. F. Zinhailo, J. Kunz +2
Asymptotically safe gravity is based on the idea that the main contribution to the Schwarzschild-like black hole spacetime is due to the value of the gravitational coupling which d…