Results 31 to 40 of about 474,897 (288)

On the stability of compact supermassive objects [PDF]

, 2001
Proceeded from the gravitation equations proposed by one of authors it was argued in a previous paper that there can exist supermassive compact configurations of degenerated Fermi-gas without events horizon. In the present paper we consider the stability
Kochetov, A., Verozub, L.
core   +5 more sources

Regular rotating MOG dark compact object [PDF]

The European Physical Journal C, 2021
AbstractA regular rotating MOG (modified gravity) compact object is derived that reduces to the Kerr black hole when the parameter $$\alpha =0$$ α = 0 .
openaire   +3 more sources

COMPACT PARTITIONS ON LARGE DIMENSION TOPOLOGICAL GRAPHS

Известия Томского политехнического университета: Промышленная кибернетика, 2023
Relevance. Distributed systems containing hundreds and thousands of objects are usually built in the form of hierarchical structures. In these structures, lower-level objects are combined into subsets for connection to the corresponding centers.
Alexander V. Pogrebnoy, Andrey V. Pogrebnoy   +1 more
doaj   +1 more source

Kepler Observations of Transiting Hot Compact Objects [PDF]

, 2010
Kepler photometry has revealed two unusual transiting companions orbiting an early A-star and a late B-star. In both cases the occultation of the companion is deeper than the transit. The occultation and transit with follow-up optical spectroscopy reveal
Basri, Gibor, Batalha, Natalie, Borucki, William J., Brown, Timothy M., Caldwell, Douglas, Cochran, William D., Dunham, Edward, Dupree, Andrea K., Fortney, Jonathan J., Gautier III, Thomas N., Gilliland, Ronald L., Howell, Steve B., Jenkins, Jon, Koch, David, Latham, David W., Lissauer, Jack . J., Marcy, Geoff, Monet, David G., Rowe, Jason F., Sasselov, Dimitar, Welsh, William F.   +20 more
core   +1 more source

Fornax compact object survey FCOS: On the nature of Ultra Compact Dwarf galaxies

, 2004
The results of the Fornax Compact Object Survey (FCOS) are presented. The FCOS aims at investigating the nature of the Ultra Compact Dwarf galaxies (UCDs) recently discovered in the center of the Fornax cluster (Drinkwater et al. 2000).
Bekki, Bekki, Bertin, Dirsch, Djorgovski, Drinkwater, Drinkwater, Drinkwater, Drinkwater, Drinkwater, Faber, Fellhauer, Ferguson, Ferguson, Ferrarese, Gebhardt, Graham, Hilker, Hilker, Hilker, Karick, Kroupa, Kundu, Kundu, L. Infante, Lotz, M. Hilker, Maraston, Meylan, Meylan, Meylan, Meylan, Mieske, Parmentier, Platais, Quintana, S. Mieske, Stiavelli, Whitmore, Worthey   +39 more
core   +1 more source

Constraining the Cosmological Density of Compact Objects with the Long-Term Variability of Quasars [PDF]

, 2002
By comparing the results from numerical microlensing simulations to the observed long-term variability of quasars, strong upper limits on the cosmological density of compact objects in the 0.0001-1 solar mass range may in principle be imposed. Here, this
Alam, Alexander, Baker, Boyle, Burles, Canizares, Carr, Coil, Cristiani, Czerny, Dalcanton, E. Zackrisson, Hawking, Hawkins, Hawkins, Hawkins, Hook, Kayser, Lineweaver, Membrado, Mohapatra, N. Bergvall, Ostriker, Pei, Pei, Pelt, Rauch, Refsdal, Refsdal, Schneider, Shalyapin, Sheth, Tadros, Véron, Wisotzki   +34 more
core   +2 more sources

Regular compact objects with scalar hair

Physical Review D, 2023
We discuss exact regular compact object solutions in higher dimensional extensions of General Relativity sourced by a phantom scalar field in arbitrary $D$ spacetime dimensions ($D>2$), for which a central singularity is absent. We follow a bottom-up approach, by means of which, by imposing the desired form of the solution to the metric function, we
Thanasis Karakasis, Nick E. Mavromatos, Eleftherios Papantonopoulos   +2 more
openaire   +2 more sources

Ultra-relativistic journeys through compact astrophysical objects

Physics Letters B
It has recently been proved that, for constant density stars, there is a critical value Λ*=1 for the dimensionless density parameter Λ ≡ 4πR2ρmax of the star above which the asymptotically measured travel time Ts along a semi-circular trajectory that ...
Shahar Hod
doaj   +1 more source

Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory

European Physical Journal C: Particles and Fields, 2023
In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss–Bonnet theory.
Shao-Jun Zhang
doaj   +1 more source

Wolf–Rayet–compact object binaries as progenitors of binary compact objects

Astronomy & Astrophysics
Binaries with a Wolf–Rayet star and a compact object (WR–COs), either a black hole (BH) or a neutron star (NS), have been proposed as possible progenitors for the binary compact object mergers (BCOs) observed with gravitational wave (GW) detectors. In this work, we use the open source population synthesis code SEVN to investigate the role of WR–COs as ...
Erika Korb, Michela Mapelli, Giuliano Iorio, Guglielmo Costa, Marco Dall’Amico   +4 more
openaire   +2 more sources