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Hawking radiation

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description Hawking radiation Overview

Hawking radiation describes a theoretical process where black holes emit thermal radiation due to quantum mechanics. This phenomenon arises from the creation of particle-antiparticle pairs near the event horizon, with one particle escaping while the other falls into the black hole. The emission causes a gradual loss of mass for the black hole over extremely long timescales. It is relevant to understanding black hole thermodynamics and offers insights into the intersection of general relativity and quantum mechanics, primarily studied by theoretical physicists and cosmologists.

help Hawking radiation FAQ

Did Stephen Hawking prove black holes are not completely black?

Hawking proposed in 1974 that quantum effects near a black hole's event horizon should make it emit thermal radiation. The effect is called Hawking radiation, but it has not been directly observed from an astrophysical black hole.

Would Hawking radiation make a black hole evaporate?

In theory, yes. Hawking radiation slowly removes mass and rotational energy, but for stellar-mass black holes the process would take far longer than the current age of the universe.

Why is Hawking radiation linked to the information paradox?

The paradox comes from asking what happens to information about matter that falls into a black hole if the black hole later evaporates thermally. Hawking's calculation helped create a major conflict between general relativity, quantum mechanics, and thermodynamics.

Why do smaller black holes radiate more than larger ones?

The Hawking temperature is inversely related to black hole mass. That means a hypothetical tiny primordial black hole would radiate more strongly than a supermassive black hole like Sagittarius A*.

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