ASTRON 1F03 Lecture Notes - Lecture 20: Quantum Field Theory, Hawking Radiation, Casimir Effect
18 Dec 2015
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Document Summary
In very energetic events small masses could be pushed into their event horizon micro black holes. Cosmic ray events are more common and more energetic and we are still here. Quantum field theory indicates particles are created continuously in a vacuum using borrowed energy (uncertainly principle): proven via casimir effect. They are created in particle anti-particle pairs. Hawking radiation is when one of them falls into black hole and the other escapes. The energy to make the particle is lost by the black hole (decreased mass) Answer: no medium no absolute reference frame exists. The speed of light in vacuum is fixed: c = 300,000 km/s in all reference frames. A spaceship is going by the earth at a speed of 0. 5c (150,000 km/sec) and emits light; the light travels at a speed of c (300,000 km/sec), not c +0. 5c according to all observers. Consequences: length and time intervals are different depending on your frame of motion.
