Hawking Radiation

-

  



See the source image



Hawking radiation, also known as Hawking–Zel'dovich radiation,is blackbody 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 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 do not gain mass through other means are expected to shrink and ultimately vanish. Micro black holes are predicted to be larger emitters of radiation than larger black holes and should shrink and dissipate faster.

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. No such micro black hole has ever been observed at CERN.

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.

Comments

Post a Comment

Popular posts from this blog

Where is the Centre of Universe

-
Image
Where is the Centre of Universe Where is the Centre of Universe? What Lies in the centre of the Universe? Case 1: The Observable Universe We are, by definition, at the very center of our observable universe. However, an alien species on a planet one billion light years away from us is at the center of their observable universe, which is very different from ours. Wherever you go, you will be at the center of your observable universe, because the observable universe is the part of the universe that you can see, and the light from all the stars and galaxies on the edge of the observable universe takes the same time to get to you, no matter which direction it came from. So you can imagine the observable universe as a sphere (or ball) that is centered on you and follows you wherever you go. However, there is nothing special about you specifically; anyone else in the universe experiences the same thing. Case 2: The Entire Universe It should be stressed that in contrast to the obs...
Read more

Oumuamua - Solar System's First Interstellar Visitor

-
Image
 Oumuamua  - Solar System's First Interstellar Visitor ʻOumuamua is the first known interstellar object to pass through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakala Observatory, Hawaii, on 19 October 2017, 40 days after it passed its closest point to the Sun. When first seen, it was about 33,000,000 km (21,000,000 mi; 0.22 AU) from Earth (about 85 times as far away as the Moon), and already heading away from the Sun. Initially assumed to be a comet, it was reclassified as an asteroid a week later, and finally (6 November 2017) as the first of the new class of interstellar object. ʻOumuamua is a small object, estimated to be about 230 by 35 meters (800 ft × 100 ft) in size. It has a dark red color, similar to objects in the outer Solar System. ʻOumuamua showed no signs of a comet tail despite its close approach to the Sun, and has significant elongation and rotation rate, so it is t...
Read more

Gravitational Waves & LIGO

-
Image
Gravitational Waves & LIGO This blog explains Gravitational Waves in Hindi language. It also explains LIGO in Hindi as well as How LIGO observatory Works. What are gravitational waves? Put simply, gravitational waves are ripples in the otherwise tough, stiff fabric of spacetime produced by the most violent phenomena the cosmos can offer—things like exploding stars and collisions between ultradense neutron stars or merging black holes. Gravitational waves are washing over Earth all the time, but our instruments have not been sensitive enough to detect them until very recently. Who first came up with the idea of gravitational waves? In 1916, Albert Einstein suggested that gravitational waves could be a natural outcome of his general theory of relativity, which says that very massive objects distort the fabric of time and space—an effect we perceive as gravity. Accordingly, very massive objects spiraling toward each other should wrinkle space-time and send those distorti...
Read more