PH607lec12-10agn2
... This luminosity is known as the Eddington limit. It is the maximum luminosity of a source of mass M, which is powered by spherical accretion of gas. Can invert the argument. If a source with observed luminosity L is radiating at the Eddington limit, the mass would be a minimum mass - source could ac ...
... This luminosity is known as the Eddington limit. It is the maximum luminosity of a source of mass M, which is powered by spherical accretion of gas. Can invert the argument. If a source with observed luminosity L is radiating at the Eddington limit, the mass would be a minimum mass - source could ac ...
Thermodynamics of Horizons from a Dual Quantum System
... On the other hand, one can define another expression for energy E which is the source of gravitational acceleration using the Tolman-Komar integral (see [12, 19]). It was shown in ref.[12] that this expression for energy also arises naturally in the case of any static horizon and allows one to obtai ...
... On the other hand, one can define another expression for energy E which is the source of gravitational acceleration using the Tolman-Komar integral (see [12, 19]). It was shown in ref.[12] that this expression for energy also arises naturally in the case of any static horizon and allows one to obtai ...
A. Bylinkin - Rencontres de Moriond
... In astrophysics, Hawking-Unruh radiation has so far never been observed The thermal hadron spectra in high energy collisions may thus indeed be the first experimental instance of such radiation, ...
... In astrophysics, Hawking-Unruh radiation has so far never been observed The thermal hadron spectra in high energy collisions may thus indeed be the first experimental instance of such radiation, ...
X-ray Polarimetry - XMM-Newton Science Operations Centre
... •Recorded pulses are convolved with signal response function. •Use measured response pulses to do optimal filtering deconvolution (Wiener filtering) to recover input. •Improves signal to noise compared to unfiltered deconvolution. ...
... •Recorded pulses are convolved with signal response function. •Use measured response pulses to do optimal filtering deconvolution (Wiener filtering) to recover input. •Improves signal to noise compared to unfiltered deconvolution. ...
Slide 1
... This reduces the electron degeneracy pressure further and accelerates the collapse. In less than a second, the core collapses into a ball of neutrons only about 10 km in radius -- a neutron star. A neutron star is supported by gravity against a different kind of pressure, neutron degeneracy pressure ...
... This reduces the electron degeneracy pressure further and accelerates the collapse. In less than a second, the core collapses into a ball of neutrons only about 10 km in radius -- a neutron star. A neutron star is supported by gravity against a different kind of pressure, neutron degeneracy pressure ...
GENERAL RELATIVITY - Raman Research Institute
... acceleration to be same as „g‟. Now the observer in „B‟ repeats the same experiment and obtains the same result. So, the observer in laboratory „B‟ cannot decide whether he is in a gravitational field or is he accelerating. From the above example we can infer that the laboratory should be in a regio ...
... acceleration to be same as „g‟. Now the observer in „B‟ repeats the same experiment and obtains the same result. So, the observer in laboratory „B‟ cannot decide whether he is in a gravitational field or is he accelerating. From the above example we can infer that the laboratory should be in a regio ...
G-stars - Gemini Astronomie
... 5,700K. Besides it has a luminosity that is 3000 times bigger than that of the Sun and has a radius of 30 times that of the Sun – Cepheids behave like that simply because they are at the brink of death: Stars like Mekbuda have a mass of about 60 solar masses up to 120 solar masses. They have a short ...
... 5,700K. Besides it has a luminosity that is 3000 times bigger than that of the Sun and has a radius of 30 times that of the Sun – Cepheids behave like that simply because they are at the brink of death: Stars like Mekbuda have a mass of about 60 solar masses up to 120 solar masses. They have a short ...
abstracts and suggested reading for
... The large body of evidence for the AdS/CFT correspondence and its wide scope of applications has led to the question whether holography is a concept intrinsically associated with AdS or whether it can be defined, via a precise dictionary, for more general spacetimes. Recently, several methods for fo ...
... The large body of evidence for the AdS/CFT correspondence and its wide scope of applications has led to the question whether holography is a concept intrinsically associated with AdS or whether it can be defined, via a precise dictionary, for more general spacetimes. Recently, several methods for fo ...
Optical studies of an ultraluminous X-ray source: NGC1313 X-2 Jifeng Liu
... ultraluminous X-ray sources • ULXs are non-nuclear X-ray point sources with Lx > 2 X 1039 erg/s, i.e., more luminous than the Eddington luminosity for stellar mass black holes, and could be intermediate mass black holes of 30 - 105 Ms ...
... ultraluminous X-ray sources • ULXs are non-nuclear X-ray point sources with Lx > 2 X 1039 erg/s, i.e., more luminous than the Eddington luminosity for stellar mass black holes, and could be intermediate mass black holes of 30 - 105 Ms ...
Black Hole Binaries in Quiescence
... • High/soft/thermal – disk dominated, little/no jet • Low/hard/jet – X-ray powerlaw, significant radio ...
... • High/soft/thermal – disk dominated, little/no jet • Low/hard/jet – X-ray powerlaw, significant radio ...
Black Holes: Do They Really Exist?
... 2,999,792,458 meter/sec. In the 19th century, it was thought that like sound wave must be transmitted through a medium, light must be transmitted by a yet-unknown medium called ether. Ether was thought to permeates the universe. Knowing Earth’s relative motion with respect to the ether was important ...
... 2,999,792,458 meter/sec. In the 19th century, it was thought that like sound wave must be transmitted through a medium, light must be transmitted by a yet-unknown medium called ether. Ether was thought to permeates the universe. Knowing Earth’s relative motion with respect to the ether was important ...
document
... • quant-ph/0703143 (Raussendorf, Harrington, Goyal) Topological fault-tolerance in cluster state quantum computation. Topologically protected quantum gates are realized by performing measurements that impose appropriate boundary conditions on a threedimensional “cluster state.” (The spatial dimensio ...
... • quant-ph/0703143 (Raussendorf, Harrington, Goyal) Topological fault-tolerance in cluster state quantum computation. Topologically protected quantum gates are realized by performing measurements that impose appropriate boundary conditions on a threedimensional “cluster state.” (The spatial dimensio ...
Lecture notes 17: Active Galaxies
... in the opposite direction. At that time the direction of the z component of the gravitational acceleration will also reverse, ultimately causing the Sun to move northward again. This oscillatory behavior above and below the mid-plane has a well defined period and amplitude that we will estimate in t ...
... in the opposite direction. At that time the direction of the z component of the gravitational acceleration will also reverse, ultimately causing the Sun to move northward again. This oscillatory behavior above and below the mid-plane has a well defined period and amplitude that we will estimate in t ...
Introductory Lectures on Black Hole Thermodynamics
... the light cones) so ∂F must be compact. This is a very weird structure for the boundary of the future of T , and in fact is incompatible with other reasonable requirements on the spacetime (see below). The only way out is if at least one of the null normals cannot be extended far enough to reach its ...
... the light cones) so ∂F must be compact. This is a very weird structure for the boundary of the future of T , and in fact is incompatible with other reasonable requirements on the spacetime (see below). The only way out is if at least one of the null normals cannot be extended far enough to reach its ...
Document
... For HD 64760 and for λ Cep we obtained very large error boxes (40-50o) Several EGRET sources inside ...
... For HD 64760 and for λ Cep we obtained very large error boxes (40-50o) Several EGRET sources inside ...
Sub-Planckian black holes and the Generalized Uncertainty Principle
... asymptotes to RC for M MPl and RS for M MPl . Models in which this function is symmetric under the duality transformation M ↔ 1/M (such as the linear and quadratic forms given above) are said to satisfy the strong BHUP correspondence [20]. One controversial implication of the BHUP correspondence ...
... asymptotes to RC for M MPl and RS for M MPl . Models in which this function is symmetric under the duality transformation M ↔ 1/M (such as the linear and quadratic forms given above) are said to satisfy the strong BHUP correspondence [20]. One controversial implication of the BHUP correspondence ...
No Slide Title
... does the moon, but the difference between the force on the near and far side of the Earth is greater for the Moon than the Sun. ...
... does the moon, but the difference between the force on the near and far side of the Earth is greater for the Moon than the Sun. ...
BLACK HOLES - Science Center of Iowa
... of space-time. We now know that these wormholes are too unstable to exist, but even if they did, wormholes could not support human “time travel” as science fiction writers would imagine it. The enormous gravity associated with black holes and wormholes would rip apart any matter that came near it. S ...
... of space-time. We now know that these wormholes are too unstable to exist, but even if they did, wormholes could not support human “time travel” as science fiction writers would imagine it. The enormous gravity associated with black holes and wormholes would rip apart any matter that came near it. S ...
Sirius Astronomer - Orange County Astronomers
... common. But intermediate-mass black holes are quite rare. This one was found in 2009 toward the edge of galaxy ESO 243-49 by the X-rays given off by material falling into it. Its estimated mass is 20,000 times that of our Sun. New observations by HST show an unresolved glow about the black hole that ...
... common. But intermediate-mass black holes are quite rare. This one was found in 2009 toward the edge of galaxy ESO 243-49 by the X-rays given off by material falling into it. Its estimated mass is 20,000 times that of our Sun. New observations by HST show an unresolved glow about the black hole that ...
Hawking radiation
Hawking radiation is black body radiation that is predicted to be released by black holes, due to quantum effects near the event horizon. It is named after the physicist Stephen Hawking, who provided a theoretical argument for its existence in 1974, and sometimes also after Jacob Bekenstein, who predicted that black holes should have a finite, non-zero temperature and entropy.Hawking's work followed his visit to Moscow in 1973 where the Soviet scientists Yakov Zeldovich and Alexei Starobinsky showed him that, according to the quantum mechanical uncertainty principle, rotating black holes should create and emit particles. Hawking radiation reduces the mass and energy of black holes and is therefore also known as black hole evaporation. Because of this, black holes that lose more mass than they gain through other means are expected to shrink and ultimately vanish. Micro black holes are predicted to be larger net emitters of radiation than larger black holes and should shrink and dissipate faster.In September 2010, a signal that is closely related to black hole Hawking radiation (see analog gravity) was claimed to have been observed in a laboratory experiment involving optical light pulses. However, the results remain unverified and debatable. Other projects have been launched to look for this radiation within the framework of analog gravity. In June 2008, NASA launched the Fermi space telescope, which is searching for the terminal gamma-ray flashes expected from evaporating primordial black holes. In the event that speculative large extra dimension theories are correct, CERN's Large Hadron Collider may be able to create micro black holes and observe their evaporation.