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Emlékezés Stephen Hawkingra

„Bármilyen nehéznek is tűnik az élet, mindig van valami, amit megtehetsz, és amiben sikerülhet.” – Stephen Hawking

Stephen W. Hawking (1942-2018) will be remembered not just for being an accomplished theoretical physicist with a brilliant mind but also for symbolising the ability of the human spirit to rise and triumph above severe physical disability of the body and achieve what is presumed to be the unthinkable. Prof Hawking was diagnosed with a debilitating condition when he was barely 21 years old, but he showed resilience over his adversities and continued to engage his mind in an attempt to theorize some of the intriguing scientific mysteries of the világegyetem.

Az ötlet fekete lyukak emerged from Albert Einstein’s general theory of relativity. The cosmic objects fekete lyukak– thought to be the biggest enigmas of the known világegyetem– are extremely dense, so dense that nothing escapes their huge gravity, not even the light. Everything gets sucked into it. This is the reason fekete lyukak hívják fekete lyukak because nothing can escape its clutches and also its impossible to see a fekete lyuk. Mert fekete lyukak do not emit light or energy in any form unlike all other cosmic objects, they would never undergo explosion. This meant fekete lyukak would be immortal.

Stephen Hawking questioned the immortality of the fekete lyukak.

című levelében „”Fekete lyukak explosions?’’, kiadva Természet in 19741, Hawking came up with the theoretical conclusion that not everything is sucked into a fekete lyuk és a fekete lyukak emit an electromagnetic radiation called Hawking sugárzás, detailing that radiation can escape from a fekete lyuk, because of the laws of quantum mechanics. Thus, fekete lyuks too would explode and convert to gamma rays. He showed that any fekete lyuk will create and emit particles such as neutrinos or photons. As a fekete lyuk emits radiation one would expect it to lose mass. This in turn would increase the surface gravity and so increase the rate of emission. The fekete lyuk would therefore have a finite life and eventually disappear into nothing.This stuck down the long-held idea by the theoretical physicists that black holes are immortal.

Hawking sugárzás was thought to contain no useful information about what the fekete lyuk engulfed because the information swallowed up by the fekete lyuk would have been lost forever.In a recent study published in 2016 in Physical Review Letters, Hawking showed that black holes have a halo of ‘soft hair’ (technically, low-energy quantum excitations) around them which might store the information. More research on this could perhaps lead toan understanding andan eventual resolution of the fekete lyuk információs probléma.

Any proof of Hawking’s theory? No observational confirmation yet seen in the cosmos. Fekete lyukak are too long-lived to be observed today at their end.

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{Az eredeti kutatási cikket a hivatkozott forrás(ok) listájában lent található DOI linkre kattintva olvashatja el}

Forrás (ok)

1. Hawking S 1974. Fekete lyuk robbanások? Természet. 248. https://doi.org/10.1038/248030a0

2. Hawking S et al 2016. Puha haj a fekete lyukakon. Phys. Rev. Lett.. 116. https://doi.org/10.1103/PhysRevLett.116.231301

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