Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Psaltis, Dimitrios"'
The redshift evolution of the Tully-Fisher Relation probes gravitational dynamics that must be consistent with any modified gravity theory seeking to explain the galactic rotation curves without the need for dark matter. Within the context of non-rel
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cf03e9e8400dafaced494e29b4dceb1
Autor:
Alpar, M. Ali, Psaltis, Dimitrios
In the inner regions of accretion disks around compact objects, the orbital frequency of the gas deviates from the local Keplerian value. For long-wavelength modes in this region, the radial epicyclic frequency kappa is higher than the azimuthal freq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbca23cdbb68f89f02ec586a3e7c3df1
https://research.sabanciuniv.edu/id/eprint/707/
https://research.sabanciuniv.edu/id/eprint/707/
Autor:
DeDeo, Simon, Psaltis, Dimitrios
Modifications to gravity that add additional functions of the Ricci curvature to the Einstein-Hilbert action -- collectively known as $f(R)$ theories -- have been studied in great detail. When considered as complete theories of gravity they can gener
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7b5b25bd6de0ef2f19e35257d831c66
Numerical simulations of turbulent, magnetized, differentially rotating flows driven by the magnetorotational instability are often used to calculate the effective values of alpha viscosity that is invoked in analytical models of accretion discs. In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0be0045b04c240b3a1747feded266d5
Autor:
Psaltis, Dimitrios
In braneworld gravity models with a finite AdS curvature in the extra dimension, the AdS/CFT correspondence leads to a prediction for the lifetime of astrophysical black holes that is significantly smaller than the Hubble time, for asymptotic curvatu
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26667d48a41bd48f727e934451cd4340
Autor:
Psaltis, Dimitrios
The five accreting, millisecond X-ray pulsars in ultracompact binaries that were recently discovered with the Rossi X-ray Timing Explorer provide excellent candidates for constraining the deviations from general relativity described by the Brans-Dick
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab8be7d879c807c599e8d223a98dfee3
http://arxiv.org/abs/astro-ph/0501234
http://arxiv.org/abs/astro-ph/0501234
Autor:
DeDeo, Simon, Psaltis, Dimitrios
The frequencies of quasi-periodic oscillations around neutron stars are believed to be related to characteristic frequencies in the gravitational fields of the compact objects. In different variability models, these include the Keplerian, epicyclic,
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eae5f234592c338cf9713e156a51f4b3
Autor:
Psaltis, Dimitrios
This is a review of recent observational and theoretical developments related to accreting neutron stars and black holes in binary systems.
Comment: 42 pages; 24 figures. To appear in "Compact Stellar X-ray Sources", eds. W.H.G. Lewin and M. van
Comment: 42 pages; 24 figures. To appear in "Compact Stellar X-ray Sources", eds. W.H.G. Lewin and M. van
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df7520b3382339d5a9712dc586a14aa0
Autor:
Psaltis, Dimitrios, Colin Norman
Publikováno v:
NASA Astrophysics Data System
Accreting neutron stars and black holes share a number of rapid variability characteristics, such as quasi-periodic oscillations and broad-band noise. The frequencies of these features were recently shown to be comparable to fundamental general relat
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d863b408dfde13d5269834cd8a92afa7
Autor:
Psaltis, Dimitrios
The variability properties of accreting compact objects predicted by dynamical models are characterized by a number of distinct frequencies that are specific to each model. Because the accretion disks around neutron stars and black holes are hydrodyn
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc32c5efae6756b8e539478c31f91138