A hypervelocity star from the Large Magellanic Cloud
... performed per initial selection of a are weighted with equal crosssection. If the distribution of orbital separations in a star cluster is flat in log a, like in the case of young star clusters (Kouwenhoven et al. 2005), we can superpose the results of these experiments in order to acquire a total v ...
... performed per initial selection of a are weighted with equal crosssection. If the distribution of orbital separations in a star cluster is flat in log a, like in the case of young star clusters (Kouwenhoven et al. 2005), we can superpose the results of these experiments in order to acquire a total v ...
What black holes teach about strongly coupled particles
... ard ’t Hooft4 and further developed by Leonard Susskind.5 The principle asserts that any theory of quantum gravity in a (d + 1)-dimensional spacetime has an equivalent description in terms of a theory that can roughly be thought of as living on the spacetime’s d-dimensional boundary. The holographic ...
... ard ’t Hooft4 and further developed by Leonard Susskind.5 The principle asserts that any theory of quantum gravity in a (d + 1)-dimensional spacetime has an equivalent description in terms of a theory that can roughly be thought of as living on the spacetime’s d-dimensional boundary. The holographic ...
ECLIPSE, Volume 1, Number 3, March - April 2017
... Why are black holes so hard to find? Black holes are often created when a lot of matter is compressed into a small space, which can happen when stars are dying and collapse in on themselves. This means the gravitational pull is so strong, light cannot escape. When no light can get out, that means th ...
... Why are black holes so hard to find? Black holes are often created when a lot of matter is compressed into a small space, which can happen when stars are dying and collapse in on themselves. This means the gravitational pull is so strong, light cannot escape. When no light can get out, that means th ...
Published by the Association Pro ISSI No. 37, May 2016
... Most stars, irrespective of their size, belong to a galaxy. The Milky Way, our home galaxy for example, may contain 400 billion stars. This fantastic number leads us to a further group of high-energy radiation sources. There is strong evidence that Black Holes exist at the centres of all, even smal ...
... Most stars, irrespective of their size, belong to a galaxy. The Milky Way, our home galaxy for example, may contain 400 billion stars. This fantastic number leads us to a further group of high-energy radiation sources. There is strong evidence that Black Holes exist at the centres of all, even smal ...
Grzegorz F
... the inner planets (Venus and Mercury) between the Sun and Earth. In the morning of June 6, 2012 we will be able to observe the passage of Venus against the solar disk. Transits of Venus are quite rare (we will have to wait for the next one until 2117) so it is not surprising that the forthcoming eve ...
... the inner planets (Venus and Mercury) between the Sun and Earth. In the morning of June 6, 2012 we will be able to observe the passage of Venus against the solar disk. Transits of Venus are quite rare (we will have to wait for the next one until 2117) so it is not surprising that the forthcoming eve ...
Supermassive black hole activity in local field early
... Virgo vs Field: Down-sizing Slopes consistent between the field and Virgo samples; also holds for detections only, as well as for the weighted subsamples Intercept slightly higher for the field sample ...
... Virgo vs Field: Down-sizing Slopes consistent between the field and Virgo samples; also holds for detections only, as well as for the weighted subsamples Intercept slightly higher for the field sample ...
find - UNAM
... expected (Bildsten & Cutler 1992), but it can be considered as an extreme case of angular momentum distribution in the system. In the future we will explore configurations with varying degrees of tidal locking. As before, the questions motivating our study are as follows. Is the neutron star tidally ...
... expected (Bildsten & Cutler 1992), but it can be considered as an extreme case of angular momentum distribution in the system. In the future we will explore configurations with varying degrees of tidal locking. As before, the questions motivating our study are as follows. Is the neutron star tidally ...
Cosmic Feedback from Supermassive Black Holes
... How did feedback from black holes influence the growth of structure? Feedback and galaxy formation Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hol ...
... How did feedback from black holes influence the growth of structure? Feedback and galaxy formation Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hol ...
document
... Astronomers also see areas in which gigantic stars have literally blown themselves to pieces. The stellar explosion, called a supernova, which led to the formation of the Crab Nebula, shown in this picture, was witnessed by Chinese astronomers in 1054 A.D. One night they noticed that an extremely br ...
... Astronomers also see areas in which gigantic stars have literally blown themselves to pieces. The stellar explosion, called a supernova, which led to the formation of the Crab Nebula, shown in this picture, was witnessed by Chinese astronomers in 1054 A.D. One night they noticed that an extremely br ...
Post-class version
... • Compare with age of oldest known objects: globular star clusters, about 12 to 15 billion years. But has the expansion rate always been the same as it is now? The mutual gravitational pull of all the galaxies in the universe could be slowing it down. ...
... • Compare with age of oldest known objects: globular star clusters, about 12 to 15 billion years. But has the expansion rate always been the same as it is now? The mutual gravitational pull of all the galaxies in the universe could be slowing it down. ...
Gravitational Waves
... – Slower, or more massive objects: all sorts of objects emit gravity in space, but many of them do not have very strong gravitational energy, so their signals are harder to detect. A larger interferometer, like one that could be in space, would potentially be able to detect these ...
... – Slower, or more massive objects: all sorts of objects emit gravity in space, but many of them do not have very strong gravitational energy, so their signals are harder to detect. A larger interferometer, like one that could be in space, would potentially be able to detect these ...
PowerPoint Presentation - ASTR498E High energy
... TIFF (Uncompressed) decompressor are needed to see this picture. ...
... TIFF (Uncompressed) decompressor are needed to see this picture. ...
Computational Complexity and Fundamental Physics
... environment, “prematurely measuring” the quantum state A few skeptics, in CS and physics, even argue that building a QC will be fundamentally impossible I don’t expect them to be right, but I hope they are! If so, it would be a revolution in physics And for me, putting quantum mechanics to the test ...
... environment, “prematurely measuring” the quantum state A few skeptics, in CS and physics, even argue that building a QC will be fundamentally impossible I don’t expect them to be right, but I hope they are! If so, it would be a revolution in physics And for me, putting quantum mechanics to the test ...
Variation of the Gravitational Constant and its Consequences
... In particular, for the purposes of this discussion, considered as a relativistic statement, the above equation declares that there once existed a free naked form of the electron. It had a radius re and this was the radius of the event horizon of a quantum black hole. This statement is justified beca ...
... In particular, for the purposes of this discussion, considered as a relativistic statement, the above equation declares that there once existed a free naked form of the electron. It had a radius re and this was the radius of the event horizon of a quantum black hole. This statement is justified beca ...
chapter18StarDeath
... • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild radius. ...
... • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild radius. ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... faster as they are squeezed into a very small space • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, the white dwarf limit (or Chandrasekhar limit) ...
... faster as they are squeezed into a very small space • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, the white dwarf limit (or Chandrasekhar limit) ...
WSRT*s contributions to knowledge of neutron stars and black holes
... amplitude of 64 km/sec (now: 72km/s) [Nature, 7 Jan.1972]. Assuming a “normal” mass of 30 Msun for the supergiant, one finds (since there are no X-ray eclipses), that the minimum mass of the unseen companion is > 6 Msun. As this is larger than the upper mass limit of 3.4 Msun of neutron stars, the c ...
... amplitude of 64 km/sec (now: 72km/s) [Nature, 7 Jan.1972]. Assuming a “normal” mass of 30 Msun for the supergiant, one finds (since there are no X-ray eclipses), that the minimum mass of the unseen companion is > 6 Msun. As this is larger than the upper mass limit of 3.4 Msun of neutron stars, the c ...
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.