![Searching for ultra-light new particles with black hole superradiance](http://s1.studyres.com/store/data/022722718_1-9fdef1e38751790bdf507217bf62732e-300x300.png)
Searching for ultra-light new particles with black hole superradiance
... New particles must couple to SM through gravity ...
... New particles must couple to SM through gravity ...
Accretion as a Source of Energy
... For comparison, consider the energy extracted from the mass m by nuclear fusion reactions (conversion of H into He): ...
... For comparison, consider the energy extracted from the mass m by nuclear fusion reactions (conversion of H into He): ...
Condition for the Superradiance Modes in Higher
... this is because of the fact that for the tiny black holes the Hawking temperature is much larger than the mass of the light Kaluza-Klein modes. However, Ref. [13] argued that the Hawking radiation on the brane is dominant because the radiation into the bulk by the light Kaluza-Klein modes is strong ...
... this is because of the fact that for the tiny black holes the Hawking temperature is much larger than the mass of the light Kaluza-Klein modes. However, Ref. [13] argued that the Hawking radiation on the brane is dominant because the radiation into the bulk by the light Kaluza-Klein modes is strong ...
A Galaxy Full of Black Holes - American Geosciences Institute
... Three classifications of black holes: Stellar-mass: 3 to 20 times the mass of our Sun Supermassive: Black holes with millions to billions of times the mass of our Sun Mid-mass: In between stellar-mass and ...
... Three classifications of black holes: Stellar-mass: 3 to 20 times the mass of our Sun Supermassive: Black holes with millions to billions of times the mass of our Sun Mid-mass: In between stellar-mass and ...
Document
... Three classifications of black holes: Stellar-mass: 3 to 20 times the mass of our Sun Supermassive: Black holes with millions to billions of times the mass of our Sun Mid-mass: In between stellar-mass and ...
... Three classifications of black holes: Stellar-mass: 3 to 20 times the mass of our Sun Supermassive: Black holes with millions to billions of times the mass of our Sun Mid-mass: In between stellar-mass and ...
The Future of Computer Science
... In the “black-box” setting, this problem takes exp(n) time even with a quantum computer (a main result from my 2004 PhD thesis, the “collision lower bound”). Even in non-blackbox setting, would let us solve e.g. Graph Isomorphism Theorem (Harlow-Hayden): Suppose there’s a ...
... In the “black-box” setting, this problem takes exp(n) time even with a quantum computer (a main result from my 2004 PhD thesis, the “collision lower bound”). Even in non-blackbox setting, would let us solve e.g. Graph Isomorphism Theorem (Harlow-Hayden): Suppose there’s a ...
Professor Emeritus, University of Canterbury Yevgeny Lifshitz
... • In 1962-3 a group centred in Pittsburgh announced that they had solved the problem and that there were no spinning solutions • I had been studying the same problem and was very surprised at this result. Ivor Robinson told me later that he and Andrzej also disbelieved it! • A preprint containing th ...
... • In 1962-3 a group centred in Pittsburgh announced that they had solved the problem and that there were no spinning solutions • I had been studying the same problem and was very surprised at this result. Ivor Robinson told me later that he and Andrzej also disbelieved it! • A preprint containing th ...
Black Holes and the Scientific Process
... conjecture' which states, without a complete formal proof, that the matter when crossing the event horizon does so irreversibly such that no information about the matter can be leaked out[6][7]. This leads to the famous black hole information paradox which contradicts the quantum mechanics paradigm ...
... conjecture' which states, without a complete formal proof, that the matter when crossing the event horizon does so irreversibly such that no information about the matter can be leaked out[6][7]. This leads to the famous black hole information paradox which contradicts the quantum mechanics paradigm ...
Black Holes: Myths, Legends and Truths
... Explanation: 4 million solar mass black hole Why do we think this is a black hole? To explain the motion we see in the stars, you need 35 billion stars per cubic lightyear ...
... Explanation: 4 million solar mass black hole Why do we think this is a black hole? To explain the motion we see in the stars, you need 35 billion stars per cubic lightyear ...
Black holes light up the universe
... horizon, for every heavenly body. Time stops at the event horizon (for the external observer) and a black hole, once formed, remains forever hidden behind its event horizon. Inside it, spacetime is so bent that no light can escape. And, furthest in, hides an abyss with no bottom, a singularity in wh ...
... horizon, for every heavenly body. Time stops at the event horizon (for the external observer) and a black hole, once formed, remains forever hidden behind its event horizon. Inside it, spacetime is so bent that no light can escape. And, furthest in, hides an abyss with no bottom, a singularity in wh ...
ppt - Case Western Reserve University
... • The merger product is the only cosmological object that will be observable to future astronomers in 100 billion years • Collision will occur during the lifetime of the sun • The night sky will change • Simulated with an N-body/hydrodynamic code (Cox & Loeb 2007) • The only paper of mine that has a ...
... • The merger product is the only cosmological object that will be observable to future astronomers in 100 billion years • Collision will occur during the lifetime of the sun • The night sky will change • Simulated with an N-body/hydrodynamic code (Cox & Loeb 2007) • The only paper of mine that has a ...
File
... Density of gas color coded by temperature. Yellow circles represent black holes. Dark matter and stars are not shown in this plot. ...
... Density of gas color coded by temperature. Yellow circles represent black holes. Dark matter and stars are not shown in this plot. ...
Black holes and everyday physics
... physics. After all, astrophysics is far from the laboratory, and quantum gravity may never be testable experimentally! This view is unduly pessimistic. As I shall show, a judicious application of black hole theory can give new insights into everyday p h y s i c s - o r d i n a r y thermodynamics, pa ...
... physics. After all, astrophysics is far from the laboratory, and quantum gravity may never be testable experimentally! This view is unduly pessimistic. As I shall show, a judicious application of black hole theory can give new insights into everyday p h y s i c s - o r d i n a r y thermodynamics, pa ...
summary lecture
... wouldn’t make sense, so L is the smallest possible black hole we can describe with both QM and GR, our current theory of gravity. ...
... wouldn’t make sense, so L is the smallest possible black hole we can describe with both QM and GR, our current theory of gravity. ...
High Mass Stellar Evolution
... The radiation pressure rapidly decreases so gravity wins and a rapid collapse occurs until the radius of the inner core reaches about 30 km. Further collapse is stopped by strong force interactions and the degeneracy pressure of neutrons The infalling matter, rebounds off the core producing a sh ...
... The radiation pressure rapidly decreases so gravity wins and a rapid collapse occurs until the radius of the inner core reaches about 30 km. Further collapse is stopped by strong force interactions and the degeneracy pressure of neutrons The infalling matter, rebounds off the core producing a sh ...
Neutron Stars and Black Holes
... Probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer Time appears to be going more and more slowly as it approaches the event horizon This called a gravitational redshift Not due to motion, but to the large gravitational ...
... Probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer Time appears to be going more and more slowly as it approaches the event horizon This called a gravitational redshift Not due to motion, but to the large gravitational ...
PPT
... – Since the curvature there isn’t very big the Equivalence Principle should hold. 2. The universe far from the black hole is described by quantum field theory (QFT) 3. The overall time evolution is still just a rotation in the space of quantum states (“unitary”) and thus obeys the quantum Liouville ...
... – Since the curvature there isn’t very big the Equivalence Principle should hold. 2. The universe far from the black hole is described by quantum field theory (QFT) 3. The overall time evolution is still just a rotation in the space of quantum states (“unitary”) and thus obeys the quantum Liouville ...
Gravitational Collapse with Negative Energy Field
... back, thanks to the effect of the C-field. We will refer to such an object as a compact massive object (CMO) or a near-black hole (NBH). In the following section we discuss the problem of gravitational collapse of a dust ball with and without the C-field to ...
... back, thanks to the effect of the C-field. We will refer to such an object as a compact massive object (CMO) or a near-black hole (NBH). In the following section we discuss the problem of gravitational collapse of a dust ball with and without the C-field to ...
NGC 3370 Spiral Galaxy - University of Kentucky
... • At this extreme mass, the repulsive force between neutrons can not hold up against the inward force of gravity. • The core continues to collapse, with no other repulsive left to stop the collapse. • The core continues to collapse forever and becomes a black hole. • The core becomes infinitely smal ...
... • At this extreme mass, the repulsive force between neutrons can not hold up against the inward force of gravity. • The core continues to collapse, with no other repulsive left to stop the collapse. • The core continues to collapse forever and becomes a black hole. • The core becomes infinitely smal ...
Hawking radiation
![](https://commons.wikimedia.org/wiki/Special:FilePath/BH_LMC.png?width=300)
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.