Journal Club presentation Helena Pikhartova April 11, 2018
Summary of article ✽ Proposition of experiment that could observe Hawking radiation 2/7
Black hole information loss paradox What happens to matter falling into a black hole? ✽ Theoretically, the quantum state of every single particle and photon that went into the black hole can be identified ✽ The information is preserved forever on the surface of the black hole But ✽ In 1975, Hawking realized black holes have a temperature, over vast periods of time, they would evaporate away until there was nothing left (Hawking radiation) ✽ PARADOX Theoretical solutions: ✽ Information within the black hole somehow leaks back out while Hawking radiation is escaping ✽ The black hole holds it all in until the very end, and as the final two particles evaporate, all the information is suddenly released back into the universe ✽ It all goes into the teeniest possible bits and nothing is lost OR the information is compressed into a microscopic space, which remains after the black hole itself has evaporated 3/7
What do they try to do? ✽ Accelerating plasma mirror and then stopping it abruptly ✽ Analogous to late time evolution of black hole Hawking evaporation ✽ Studying entanglement to observe black hole unitarity 4/7
How will they do it? 5/7
Details Plasma mirror concept: Backgrounds of the experiment: ✽ Compton scattering (but going opposite direction) ✽ entangled double-photon emission via accelerated electrons or double-photon Compton backscattering 6/7
Related work ✽ 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. 7/7
The end of presentation 1/2
Discussion 2/2
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