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Gravitational instability of exotic compact objects [PDF]
European Physical Journal C: Particles and Fields, 2020 Exotic compact objects with physical surfaces a Planckian distance away from where the horizon would have been are inspired by quantum gravity. Most of these objects are defined by a classical spacetime metric, such as boson stars, gravastars and ...
Andrea Addazi +2 more
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Jets from compact objects [PDF]
Symposium - International Astronomical Union, 2000 Some topics in the theory of jets are reviewed. These include jet precession, unconfined jets, the origin of knots, the internal shock model as a unifying theme from protostellar jets to Gamma-ray bursts, relations between the Blandford-Znajek and MHD ...
Spruit, H. C.
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Astroparticle Physics with Compact Objects [PDF]
Universe, 2021 Probing the existence of hypothetical particles beyond the Standard model often deals with extreme parameters: large energies, tiny cross-sections, large time scales, etc.
Peter Tinyakov +2 more
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Onset of superradiant instabilities in rotating spacetimes of exotic compact objects
Journal of High Energy Physics, 2017 Exotic compact objects, horizonless spacetimes with reflective properties, have intriguingly been suggested by some quantum-gravity models as alternatives to classical black-hole spacetimes.
Shahar Hod
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Compact objects in conformal nonlinear electrodynamics
European Physical Journal C: Particles and Fields, 2019 In this paper we consider a special case of vacuum nonlinear electrodynamics with a stress–energy tensor conformal to the Maxwell theory. Distinctive features of this model are the absence of a dimensional parameter for the nonlinearity description and a
I. P. Denisova +2 more
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Broad-Band Variability in Accreting Compact Objects [PDF]
Acta Polytechnica CTU Proceedings, 2015 Cataclysmic variable stars are in many ways similar to X-ray binaries. Both types of systems possess an accretion disk, which in most cases can reach the surface (or event horizon) of the central compact object.
S. Scaringi
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Compact Objects in Alternative Gravities
Universe, 2022 We address neutron stars and black holes in alternative gravities, after recalling their basic properties in General Relativity. Among the plethora of interesting alternative gravities we here focus on an interesting set of scalar-tensor theories.
Jose Luis Blázquez-Salcedo +2 more
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Exotic Compact Objects with Two Dark Matter Fluids
The Astrophysical Journal, 2023 The generic properties of compact objects made of two different fluids of dark matter are studied in a scale-invariant approach. We investigate compact objects with a core–shell structure, where the two fluids are separated, and with mixed dark matter ...
Marie Cassing +3 more
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On the Maximum Energy Release from Formation of Static Compact Objects
Galaxies, 2023 Type II Supernova 1987A (SN 1987A), observed in 1987, released an energy of Q≈3×1053 erg. This huge energy is essentially the magnitude of gravitational potential or self-gravitational energy (PE) of a new born cold neutron star having a gravitational ...
Abhas Mitra, Krishna Kumar Singh
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Repeating fast radio bursts from collapses of the crust of a strange star
The Innovation, 2021 Summary: Strange stars (SSs) are compact objects made of deconfined quarks. It is hard to distinguish SSs from neutron stars as a thin crust composed of normal hadronic matter may exist and obscure the whole surface of the SS.
Jinjun Geng, Bing Li, Yongfeng Huang
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