HAWKING RADIATION

Contents

• What is Hawking Radiation ?• Introduction to Black Holes• Properties of Black Holes• Videos to explain Hawking Radiation• Black Hole Evaporation

What is Hawking Radiation ?

• Hawking radiation is blackbody radiation that is predicted to be released by black holes, due to quantum effects near the event horizon

• named after the physicist Stephen Hawking• Theoretical argument for its existence was

proposed in 1974

Black hole showing hawking radiation

Introduction to Black holes

• Region of space resulting from the collapse of a star

• Region of space with strong gravitational field that even light cannot escape it.

Properties of Black Holes… e.g.

Time dilation, gravitational redshift,“spaghettification”

“No hair theorem”

…. Hawking radiation…. Kerr black Holes….

red-shifted

red-shifted intooblivion

From inside this region

no informationcan escape

Types of black holes

• Stellar : When a super massive star collapse• Supermassive : likely exist in the centers of

most galaxies• Miniature : mass much smaller than that of

our Sun (theoretical)

….having FUN !

Hawking Radiation Detailed..

Videos Explaining Hawking Radiation

• Hawking radiation explained • Short review of Hawking Radiation

12

• The energy needed to create the real particles comes from the gravitational field of the black hole.

• Hence, the emission of Hawking radiation reduces the mass of the black hole. As the process continues, the black hole will finally disappear. This is called black hole evaporation.

• In fact, the time required for evaporation is given by

yearskgMtevap

3

1210

1010

Black Hole Evaporation