Results 41 to 50 of about 477,311 (280)

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

Very Old Isolated Compact Objects as Dark Matter Probes

, 2011
Very old isolated neutron stars and white dwarfs have been suggested to be probes of dark matter. To play such a role, two requests should be fulfilled, i.e., the annihilation luminosity of the captured dark matter particles is above the thermal emission
H. Bondi, Jin Chang, Rui-Zhi Yang, S. L. Shapiro, Yi-Zhong Fan   +4 more
core   +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

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 ...
Korb E., Mapelli M., Iorio G., Costa G., Dall'Amico M.   +4 more
openaire   +2 more sources

LOCALLY COMPACT OBJECTS IN EXACT CATEGORIES [PDF]

International Journal of Mathematics, 2011
We identify two categories of locally compact objects on an exact category [Formula: see text]. They correspond to the well-known constructions of the Beilinson category [Formula: see text] and the Kato category [Formula: see text]. We study their mutual relations and compare the two constructions.
openaire   +3 more sources

A survey of Low Luminosity Compact sources and its implication for evolution of radio-loud AGNs. I. Radio data

, 2010
We present a new sample of Compact Steep Spectrum (CSS) sources with radio luminosity below 10^26 W/Hz at 1.4 GHz called the low luminosity compact (LLC) objects.
A. Labiano, A. Siemiginowska, Alexander, Czerny, De Vries, Drake, Fanaroff, Fanti, Gawroński, Giroletti, Gopal-Krishna, Gugliucci, Holt, Kaiser, Kunert-Bajraszewska, Kunert-Bajraszewska, Kunert-Bajraszewska, Kunert-Bajraszewska, Labiano, Labiano, Labiano, Laing, M. Kunert-Bajraszewska, M. P. Gawroński, Marecki, Marecki, Marecki, Mazzarella, Meliani, Miller, O'Dea, Saikia, Snellen, Snellen, Subrahmanyan, Tasse, Xiang   +36 more
core   +1 more source

Physics of accretion flows around compact objects [PDF]

, 2006
Several physical and astrophysical problems related to accretion onto black holes and neutron stars are shortly reviewed. I discuss the observed differences between these two types of compact objects in quiescent Soft X-ray Transients.
Abramowicz, Abramowicz, Aharonian, Bahcall, Barceló, Bardeen, Bejger, Berti, Bildsten, Blandford, Blandford, Bondi, Buchdahl, Campana, Casares, Cattoen, Chapline, Chapline, Chapline, Chen, Chen, Davis, Deloye, Dubus, Dubus, Dyson, Fender, Fender, Gallo, Gammie, Goldston, Haensel, Haensel, Hartle, Hopkins, Hughes, Hughes, Ichimaru, Jean-Pierre Lasota, Jonker, Kesden, King, King, Krasnopolsky, Lasota, Lasota, Lasota, Lasota, Li, Mazur, Menou, Menou, Menou, Mirabel, Moderski, Moderski, Narayan, Narayan, Narayan, Narayan, Narayan, Narayan, Natarajan, Nelemans, Oppenheimer, Paczyński, Paczyński, Papaloizou, Rothman, Ruffini, Rutledge, Schunck, Schwarz, Schwarzschild, Schödel, Shafee, Sikora, Torres, Volonteri, Wilson, Yuan, Yungelson   +81 more
core   +4 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

Pair Creation in Hot Electrosphere of Compact Astrophysical Objects

The Astrophysical Journal
The mechanism of pair creation in the electrosphere of compact astrophysical objects such as quark stars or neutron stars is revisited, paying attention to evaporation of electrons and acceleration of electrons and positrons, which were previously not ...
Mikalai Prakapenia, Gregory Vereshchagin
doaj   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source