Fiziev
... The obtained in this article behavior of a quantum test particles in the gravitational field of point source of gravity seems to us to be much more physical then the one in the wide spread models of black holes. Clearly, in contrast to such space-time holes with nonphysical infinitely deep well in ...
... The obtained in this article behavior of a quantum test particles in the gravitational field of point source of gravity seems to us to be much more physical then the one in the wide spread models of black holes. Clearly, in contrast to such space-time holes with nonphysical infinitely deep well in ...
The Milky Way
... received from the source at different distances. • Inverse square Law: B ≈ 1/(distance)2 Light rays • B = L / 4πR2 • Sun 5 x 1026 watts ...
... received from the source at different distances. • Inverse square Law: B ≈ 1/(distance)2 Light rays • B = L / 4πR2 • Sun 5 x 1026 watts ...
Neutron Stars and Pulsars
... • Outside its event horizon, a Kerr black hole has a region, called the ergosphere, in which spacetime is dragged along with the rotating black hole. In principle, energy can be extracted from the ergosphere. • An object dropped into the ergosphere can break into two parts. One of them drops through ...
... • Outside its event horizon, a Kerr black hole has a region, called the ergosphere, in which spacetime is dragged along with the rotating black hole. In principle, energy can be extracted from the ergosphere. • An object dropped into the ergosphere can break into two parts. One of them drops through ...
PowerPoint - Mark Kidger
... • As very few of the previous outbursts had been well-observed, the models were very uncertain – they had given a range of at least 9 months in the date of outburst. – Many parameters (masses, orbit, energy loss to gravitational radiation, spin, etc …) to fit. – Not enough precise timings of outburs ...
... • As very few of the previous outbursts had been well-observed, the models were very uncertain – they had given a range of at least 9 months in the date of outburst. – Many parameters (masses, orbit, energy loss to gravitational radiation, spin, etc …) to fit. – Not enough precise timings of outburs ...
Quantum Emission from Two
... The discovery of Hawking radiation[1] has raised a longstanding puzzle: what happens to black holes once they’re done evaporating? There are at least two reasons why this problem is interesting. The first is general: the final stages of black hole evaporation typically involve physics near the Planc ...
... The discovery of Hawking radiation[1] has raised a longstanding puzzle: what happens to black holes once they’re done evaporating? There are at least two reasons why this problem is interesting. The first is general: the final stages of black hole evaporation typically involve physics near the Planc ...
Colgate seminar 15 Feb 2011 - DCC
... Are they really out there? The idea of black holes is pretty exotic. We’d like to know if black holes actually exist. If they do, what are their properties? How massive? How many? At first, it seems unlikely that we could ever know. After all, if even light can’t escape from a black hole, how could ...
... Are they really out there? The idea of black holes is pretty exotic. We’d like to know if black holes actually exist. If they do, what are their properties? How massive? How many? At first, it seems unlikely that we could ever know. After all, if even light can’t escape from a black hole, how could ...
Monster Black Holes - Indiana University Astronomy
... about 2200 x the black hole’s radius As the cloud approaches Sgr A*, gravity “spagettifies” the cloud ...
... about 2200 x the black hole’s radius As the cloud approaches Sgr A*, gravity “spagettifies” the cloud ...
Do flares in Saggitarius A* reflect the last stage of tidal capture
... most transparent material available – hydrogen at a high enough temperature -, so that its opacity is due only to Thomson scattering (k = 0.4cm2/g), and assume that photons are loosing no energy when diffusively scattering to the surface. Then: tg = (1/c) (k M/R), or ...
... most transparent material available – hydrogen at a high enough temperature -, so that its opacity is due only to Thomson scattering (k = 0.4cm2/g), and assume that photons are loosing no energy when diffusively scattering to the surface. Then: tg = (1/c) (k M/R), or ...
Document
... gamma ray bursts have been found to be associated with the deaths of very large stars. The favored models for these is the “core collapse supernova,” where the massive core of the star collapses into a black hole and black hole accretion powers a luminous jet. Despite numerous observations, many of ...
... gamma ray bursts have been found to be associated with the deaths of very large stars. The favored models for these is the “core collapse supernova,” where the massive core of the star collapses into a black hole and black hole accretion powers a luminous jet. Despite numerous observations, many of ...
White Dwarf Stars - University of California Observatories
... • Recently, Joe Taylor and Russell Hulse won a Nobel Prize for their study of pulsars. • These objects act as cosmic clocks and are useful for ...
... • Recently, Joe Taylor and Russell Hulse won a Nobel Prize for their study of pulsars. • These objects act as cosmic clocks and are useful for ...
PowerPoint Presentation - Super Massive Black Holes
... taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A. Located in Canis Major, Sirius is the brightest star in the Earth’s night sky. The distance between A and B varies from 8 to 31 AU. ...
... taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A. Located in Canis Major, Sirius is the brightest star in the Earth’s night sky. The distance between A and B varies from 8 to 31 AU. ...
NASA`s X-ray Eye on the Universe
... • X-rays good clear view, even when edge-on • BH grows as matter falls in • Other matter is pushed outwards: jets, winds ...
... • X-rays good clear view, even when edge-on • BH grows as matter falls in • Other matter is pushed outwards: jets, winds ...
this poster - Astrophysics
... supermassive black holes subject to assumptions about accretion efficiency and how rotational energy is stored in, and released from, the ergosphere of spinning black holes. Simple-minded calculations suggest that constraints on efficiency may be uncomfortably close to maxima suggested by theories f ...
... supermassive black holes subject to assumptions about accretion efficiency and how rotational energy is stored in, and released from, the ergosphere of spinning black holes. Simple-minded calculations suggest that constraints on efficiency may be uncomfortably close to maxima suggested by theories f ...
The Death of Stars - Mounds Park Academy Blogs
... three times the Sun’s mass will collapse past the neutron star stage. • When the mass has been compressed to a certain size, its gravitational radius, radiation from the star can no longer escape into space. • A black hole is formed and from its surface nothing escapes not even light. ...
... three times the Sun’s mass will collapse past the neutron star stage. • When the mass has been compressed to a certain size, its gravitational radius, radiation from the star can no longer escape into space. • A black hole is formed and from its surface nothing escapes not even light. ...
Chapter 14 Practice Questions
... masses of component stars can be determined C) The detection of an extremely dark point in the sky from which no light at all is ...
... masses of component stars can be determined C) The detection of an extremely dark point in the sky from which no light at all is ...
stellar remenants
... • From the period of the pulse, it had to be extremely dense but associated with a supernova explosion. • Spin of a neutron star and its magnetic field generates powerful electric fields. • Emission created by accelerating charges called synchrotron radiation (low energy radiation at radio wavelengt ...
... • From the period of the pulse, it had to be extremely dense but associated with a supernova explosion. • Spin of a neutron star and its magnetic field generates powerful electric fields. • Emission created by accelerating charges called synchrotron radiation (low energy radiation at radio wavelengt ...
White Dwarf Stars
... • Recently, Joe Taylor and Russell Hulse won a Nobel Prize for their study of pulsars. • These objects act as cosmic clocks and are useful for probing the dynamics of stars. ...
... • Recently, Joe Taylor and Russell Hulse won a Nobel Prize for their study of pulsars. • These objects act as cosmic clocks and are useful for probing the dynamics of stars. ...
Today`s Objectives - RanelaghALevelPhysics
... • You don't get green stars because the light from stars is emitted at a range of wavelengths, so there is mixing of colours. So those stars with a λmax in the green region will actually appear to be white. ...
... • You don't get green stars because the light from stars is emitted at a range of wavelengths, so there is mixing of colours. So those stars with a λmax in the green region will actually appear to be white. ...
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.