Are Kerr black holes real?
Kerr black holes are purely theoretical, but if they do exist they offer the adventurous time traveler a one-way trip into the past or future..
Do Kerr black holes exist?
Kerr black holes are purely theoretical, but if they do exist they offer the adventurous time traveler a one-way trip into the past or future..
How fast can a black hole spin?
Many black holes, from their measured spins, are spinning at more than 90% the speed of light.
This might seem like a puzzle, but physics not only has an explanation for why, but shows us that it's very difficult to create black holes that spin slowly relative to the speed of light..
How quickly do black holes spin?
Typically, black holes spin really fast — near the speed of light.
But astronomers have noticed that one monster black hole is spinning much more slowly than most smaller black holes.
The finding may reveal clues about how these supermassive black holes form..
Is Kerr black hole possible?
A Kerr black hole is a rotating, electrically neutral black hole.
It is said to be extremal if it has the highest possible angular momentum that is compatible with its mass.
Extremal Kerr black holes have yet to be detected, but many theories predict their existence..
What did Roy Kerr discover?
In 1963, while working at the University of Austin in Texas, Dr Kerr did something that had eluded scientists for 47 years – he discovered the solution to Einstein's equations that define the space outside a rotating star or black hole.
This was something many in the field doubted could be done..
What is Roy Kerr famous for?
Professor Roy Patrick Kerr is an eminent mathematician, known internationally for discovering the Kerr Vacuum, an exact solution to the Einstein field equation of general relativity..
What is Roy Kerr's theory on time travel?
In the 1960s, New Zealand mathematician Roy Kerr calculated that a spinning black hole collapses not into a point, but into a ring; if something passed through this ring, it might travel through a tunnel in spacetime called an Einstein-Rosen bridge, or wormhole..
What is the charge of a black hole spin?
In our universe, black holes are almost always spinning (because they form from spinning bodies of matter) and almost always have zero net electric charge (because of the tendency of electric charge to attract opposite types of electric charge and self-neutralize)..
What is the formula for Kerr parameter?
a=J/(Mc) is called "Kerr parameter" or angular momentum per unit mass it has the dimension of length.
One can get this dimensionless by e.g. χ=a/(MG)c2..
What is the Kerr black hole theory?
Kerr postulated that if dying stars collapsed into a rotating ring of neutron stars, their centrifugal force would prevent them from turning into a singularity.
Since the black hole wouldn't have a singularity, Kerr believed it would be safe to enter without fear of the infinite gravitational force at its center..
What is the Kerr metric used for?
The Kerr metric is a description of spacetime around spinning black holes.
The mathematics postulates the existence of an inner horizon.
Though this is not necessarily a “physical” surface — just a mathematical one.
The outer event horizon is the natural result of the Kerr mathematics..
What is the radius of a rotating black hole?
The "radius" (there is no physical surface) of the event horizon of a rotating black hole, depends on both it's mass M and angular momentum J, and is given by the equation r=GMc2+√(GMc2)2−(JMc)2..
Where does Roy Kerr live?
Personal life.
Kerr is married to Margaret.
In 2022, after 9 years in Tauranga they returned to Christchurch, where they now reside..
Who discovered Kerr black hole?
Professor Hawking wrote: “In 1963, Roy Kerr, a New Zealander, found a set of solutions of the equations of general relativity that described rotating black holes.
These 'Kerr' black holes rotate at a constant rate, their size and shape depending only on their mass and rate of rotation..
Who discovered Kerr black hole?
Professor Hawking wrote: “In 1963, Roy Kerr, a New Zealander, found a set of solutions of the equations of general relativity that described rotating black holes.
These 'Kerr' black holes rotate at a constant rate, their size and shape depending only on their mass and rate of rotation.Aug 28, 2023.
- a=J/(Mc) is called "Kerr parameter" or angular momentum per unit mass it has the dimension of length.
- In 1963, while working at the University of Austin in Texas, Dr Kerr did something that had eluded scientists for 47 years – he discovered the solution to Einstein's equations that define the space outside a rotating star or black hole.
This was something many in the field doubted could be done. - In the 1960s, New Zealand mathematician Roy Kerr calculated that a spinning black hole collapses not into a point, but into a ring; if something passed through this ring, it might travel through a tunnel in spacetime called an Einstein-Rosen bridge, or wormhole.
- Personal life.
Kerr is married to Margaret.
In 2022, after 9 years in Tauranga they returned to Christchurch, where they now reside. - Professor Hawking wrote: “In 1963, Roy Kerr, a New Zealander, found a set of solutions of the equations of general relativity that described rotating black holes.
These 'Kerr' black holes rotate at a constant rate, their size and shape depending only on their mass and rate of rotation. - Professor Hawking wrote: “In 1963, Roy Kerr, a New Zealander, found a set of solutions of the equations of general relativity that described rotating black holes.
These 'Kerr' black holes rotate at a constant rate, their size and shape depending only on their mass and rate of rotation.Aug 28, 2023 - Professor Roy Patrick Kerr is an eminent mathematician, known internationally for discovering the Kerr Vacuum, an exact solution to the Einstein field equation of general relativity.
- The Kerr solution is also related to various non-vacuum solutions which model black holes.
For example, the Kerr–Newman electrovacuum models a (rotating) black hole endowed with an electric charge, while the Kerr–Vaidya null dust models a (rotating) hole with infalling electromagnetic radiation. - The Kerr solution is characterized by mass M and specific angular momentum a.
For a2 \x26gt; M2, it describes an asymptotically flat spacetime with a naked singularity.
For a2 ≤ M2, it represents a rotating black hole that has two horizons which coalesce into a degenerate horizon for a2 = M2 – an extreme Kerr black hole.
