08/08/2022

## Is the no-hair theorem true?

There is still no rigorous mathematical proof of a general no-hair theorem, and mathematicians refer to it as the no-hair conjecture. Even in the case of gravity alone (i.e., zero electric fields), the conjecture has only been partially resolved by results of Stephen Hawking, Brandon Carter, and David C.

## What does black holes have no hair means?

In fact, black holes can be fully characterized by only three physical quantities: their mass, spin and charge. Since they have no additional “hairy” attributes to distinguish them, black holes are said to have “no hair”—Black holes of the same mass, spin, and charge are exactly identical to each other. Dr.

Why is it called the no-hair theorem?

The no-hair theorem is the statement that a black hole is characterized by only three observable properties – its mass, angular momentum and electrical charge. “No hair” refers to the resemblance of a black hole to a bald head with few defining features.

### Who said black holes have no hair?

physicist John Wheeler
The notion that black holes have very few features to distinguish them from one another is called the no-hair theorem, a metaphor first popularized by physicist John Wheeler. The idea is that beyond mass, charge and spin, black holes don’t have distinguishing features — no hairstyle, cut or color to tell them apart.

### Why did Einstein not believe in black holes?

The concept that explains black holes was so radical, in fact, that Einstein, himself, had strong misgivings. He concluded in a 1939 paper in the Annals of Mathematics that the idea was “not convincing” and the phenomena did not exist “in the real world.”

What is the YES hair theorem?

The “yes hair theorem” claims to resolve the paradox by bridging the gap between general relativity and quantum mechanics. The notion of quantum hair allows information about what goes into a black hole to come out again without violating any of the important principles of either theory.

#### What is a black hole hair?

Black holes are dead stars that have collapsed and have such strong gravity that not even light can escape. New research claims to have resolved the paradox by showing that black holes have a property which they call “quantum hair”.

#### What is a quantum hair?

As matter collapses into a black hole, they suggest, it leaves a faint imprint in its gravitational field. This imprint is referred to as “quantum hair” and, the authors say, would provide the mechanism by which information is preserved during the collapse of a black hole.

What is quantum hair theory?

Quantum hair allows the internal state of the black hole, reflected in the coefficients , to affect the Hawking radiation. The result is manifestly unitary, and the final state in (4) is manifestly a pure state. For each distinct initial state given by the there is a different final radiation state.

## How did Feynman and Wheeler obtain the Time-Reversal Theory?

Feynman and Wheeler obtained this result in a very simple and elegant way. They considered all the charged particles (emitters) present in our universe and assumed all of them to generate time-reversal symmetric waves. The resulting field is

How did Feynman and Wheeler obtain the total electromagnetic field?

Feynman and Wheeler obtained this result in a very simple and elegant way. They considered all the charged particles (emitters) present in our universe and assumed all of them to generate time-reversal symmetric waves. The resulting field is holds, then , being a solution of the homogeneous Maxwell equation, can be used to obtain the total field

### How did Wheeler and Feynman come up with the Lagrangian equation?

Alternatively, the way that Wheeler/Feyman came up with the primary equation is: They assumed that their Lagrangian only interacted when and where the fields for the individual particles were separated by a proper time of zero.

### What is the PMID for Fokker-Wheeler-Feynman model of electrodynamics?

PMID 9906108. ^ Moore, R. A.; Scott, T. C. (1992). “Quantization of Second-Order Lagrangians: The Fokker-Wheeler-Feynman model of electrodynamics”. Physical Review A. 46 (7): 3637–3645.