UNIVERSE - Qatar University

... - A region of spacetime from which nothing can escape - It comes from stars -a star spends all its energy -contracts -pulls things inside its own -the center singularity -border event horizon -no time and no event inside it ...

... - A region of spacetime from which nothing can escape - It comes from stars -a star spends all its energy -contracts -pulls things inside its own -the center singularity -border event horizon -no time and no event inside it ...

4.5.5. Black Holes

... Region II is therefore called a black hole. The spherical surface at r rS is called the event horizon. To the Minkowskian observer at r , light emitted by an ingoing particle will be redshifted by an increasing amount as the particle approaches the event horizon. Physically, one possible way t ...

... Region II is therefore called a black hole. The spherical surface at r rS is called the event horizon. To the Minkowskian observer at r , light emitted by an ingoing particle will be redshifted by an increasing amount as the particle approaches the event horizon. Physically, one possible way t ...

General Astrophysical Concepts: Astronomical length scales

... Which of the following statements is FALSE? A. B. ...

... Which of the following statements is FALSE? A. B. ...

BLACK HOLES

... A black hole is a spherical region in space in which some mass has been crushed by gravity to the point that the escape speed from the object becomes larger than the speed of light. Any mass can be squeezed into a black hole: stars, planets, & people. The boundary at which this critical escape speed ...

... A black hole is a spherical region in space in which some mass has been crushed by gravity to the point that the escape speed from the object becomes larger than the speed of light. Any mass can be squeezed into a black hole: stars, planets, & people. The boundary at which this critical escape speed ...

Physics 161: Black Holes: Lecture 21: 23 Feb 2011 21

... whenever a mass M is concentrated inside a region with circumference in any direction smaller than 2πrS , (2π(2GM/c2 )), then a horizon forms, i.e. that a region from which light cannot escape comes into existance. This conjecture has not been proved so is more like a physicists rule of thumb. The b ...

... whenever a mass M is concentrated inside a region with circumference in any direction smaller than 2πrS , (2π(2GM/c2 )), then a horizon forms, i.e. that a region from which light cannot escape comes into existance. This conjecture has not been proved so is more like a physicists rule of thumb. The b ...

Lecture 18

... Above a black hole, one can get sucked in. The other annihilates above the surface to cause radiation. Since its close to the surface, the light gets redshifted escaping, but it carries energy with it! ...

... Above a black hole, one can get sucked in. The other annihilates above the surface to cause radiation. Since its close to the surface, the light gets redshifted escaping, but it carries energy with it! ...

Physics 161: Black Holes: Lecture 20: 22 Feb 2010 20

... whenever a mass M is concentrated inside a region with circumference in any direction smaller than 2πrS , (2π(2GM/c2 )), then a horizon forms, i.e. that a region from which light cannot escape comes into existance. This conjecture has not been proved so is more like a physicists rule of thumb. The b ...

... whenever a mass M is concentrated inside a region with circumference in any direction smaller than 2πrS , (2π(2GM/c2 )), then a horizon forms, i.e. that a region from which light cannot escape comes into existance. This conjecture has not been proved so is more like a physicists rule of thumb. The b ...

Lecture (pdf)

... Black hole cosmology in gravity with torsion The conservation law for angular momentum of elementary particles in curved spacetime, consistent with relativistic quantum mechanics, extends general relativity to the Einstein-Cartan theory of gravity. In this theory, spacetime has a geometric structure ...

... Black hole cosmology in gravity with torsion The conservation law for angular momentum of elementary particles in curved spacetime, consistent with relativistic quantum mechanics, extends general relativity to the Einstein-Cartan theory of gravity. In this theory, spacetime has a geometric structure ...

Part I

... Second Law of Black-Hole Mechanics 2nd law • The area A of the horizon of a black hole is a non-decreasing function of time; i.e. ΔA ≥ 0. Thermodynamic analogy • The entropy of an isolated system is a non-decreasing function of time; i.e. ΔS ≥ 0. Hawking radiation • If the quantum fluctuations of t ...

... Second Law of Black-Hole Mechanics 2nd law • The area A of the horizon of a black hole is a non-decreasing function of time; i.e. ΔA ≥ 0. Thermodynamic analogy • The entropy of an isolated system is a non-decreasing function of time; i.e. ΔS ≥ 0. Hawking radiation • If the quantum fluctuations of t ...

Black Hole Video Questions

... 1. When stars ten times bigger than the sun explode a (nova) (supernova) (hypernova) occurs. 2. Black holes form from stars that are (10) (100) (1000) times as big as the sun. 3. When these stars explode a (nova) (supernova) (hypernova) occurs. 4. (Ultraviolet) (Infrared) (Gamma) ray bursts are sign ...

... 1. When stars ten times bigger than the sun explode a (nova) (supernova) (hypernova) occurs. 2. Black holes form from stars that are (10) (100) (1000) times as big as the sun. 3. When these stars explode a (nova) (supernova) (hypernova) occurs. 4. (Ultraviolet) (Infrared) (Gamma) ray bursts are sign ...

Rational Functions and Black Holes

... Physicists call the speed of light in a vacuum c. It is approximately c ≈ 300, 000 km/sec This is fast enough to go around the earth more than seven times in one second!1 However, light moves slower when it goes through air, water, or other material. Light can also be slowed down by gravity of very ...

... Physicists call the speed of light in a vacuum c. It is approximately c ≈ 300, 000 km/sec This is fast enough to go around the earth more than seven times in one second!1 However, light moves slower when it goes through air, water, or other material. Light can also be slowed down by gravity of very ...

Black holes - schoolphysics

... The escape velocity of a body obviously increases the closer to the body that you go, for example for the Earth the escape velocity at the surface of the planet is 11.3 km per second 10 000 km above the surface this will have fallen to just under 7 km per second. Clearly for a Black Hole there will ...

... The escape velocity of a body obviously increases the closer to the body that you go, for example for the Earth the escape velocity at the surface of the planet is 11.3 km per second 10 000 km above the surface this will have fallen to just under 7 km per second. Clearly for a Black Hole there will ...

PowerPoint Presentation - Advanced Quantum Mechanics

... For an observer falling into a big enough black hole nothing much happens while falling through the event horizon. However the "irresistible" flow of time is accompanied by an "irresistible" falling towards the singularity - due to the mixing of space and time. ...

... For an observer falling into a big enough black hole nothing much happens while falling through the event horizon. However the "irresistible" flow of time is accompanied by an "irresistible" falling towards the singularity - due to the mixing of space and time. ...

14-black-holes

... • What is the life cycle of a low mass star (<8 solar masses when on the main sequence)? • What is the life cycle of a high mass star (>8 solar masses when on the main sequence)? • After a supernova, what are the two fates of the core of the star? • What determines whether the core will be a neutron ...

... • What is the life cycle of a low mass star (<8 solar masses when on the main sequence)? • What is the life cycle of a high mass star (>8 solar masses when on the main sequence)? • After a supernova, what are the two fates of the core of the star? • What determines whether the core will be a neutron ...

UNIT 3 INPUT 2: Notes on Black Holes (BH): Process of Formation

... Gravity lenses: When a big object passes between a star and the Earth, the object acts like a lens and causes the star to brighten (used to detect BH) Radial distance: How far away one is from the singularity Escape velocity: the speed needed for a star to break free from another’s gravity Spherical ...

... Gravity lenses: When a big object passes between a star and the Earth, the object acts like a lens and causes the star to brighten (used to detect BH) Radial distance: How far away one is from the singularity Escape velocity: the speed needed for a star to break free from another’s gravity Spherical ...

solution

... Principle describe how energy and time can give rise to virtual pair production. This is the continuous process of the production (and quick annihilation) of pairs of antiparticles. If this happens right at the event horizon, one particle is lost to the back hole, while the other carries mass away f ...

... Principle describe how energy and time can give rise to virtual pair production. This is the continuous process of the production (and quick annihilation) of pairs of antiparticles. If this happens right at the event horizon, one particle is lost to the back hole, while the other carries mass away f ...

Black Holes: The Ultimate Abyss from discovery channel

... 7. To zoom from one galaxy to another faster than the speed of light, some astrophysicists have proposed that we need to _____. A) squeeze the time dimension of space-time B) make worm holes that connect black holes C) build a spaceship that can travel faster than light D) find the entry and exit po ...

... 7. To zoom from one galaxy to another faster than the speed of light, some astrophysicists have proposed that we need to _____. A) squeeze the time dimension of space-time B) make worm holes that connect black holes C) build a spaceship that can travel faster than light D) find the entry and exit po ...

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.