He is the PI of the largest NSF award that supported the 2017 EHT observations and analyses, funded through the PIRE program. As a founding member of the Event Horizon Telescope, the international collaboration that has taken the first picture of a black hole (see attached image), Psaltis served as Project Scientist from 2016-2019. His research group pioneered the development of tests of the theory of general relativity using the observational appearance of black holes and neutron stars. Speaker's Bio: Dimitrios Psaltis is a Professor of Astronomy and Physics at the University of Arizona. In this talk, I will present the many ways in which the Event Horizon telescope offers unprecedented views into the inner workings of plasma near the horizons of black holes and how it allows us to perform some of the most stringent tests of Einstein’s General Theory of Relativity.
The observed radiation has originated in two of the strongest gravitational fields found in the Universe, encoding during their travel to the Earth the properties of the black-hole spacetimes. Hawking and collaborators will publish a paper at the end of the month expanding on the subject.The Department of Physics cordially invites the Ateneo community to a Black hole Astrophysics talk with Dr Dimitrios Psaltis (Professor of Astronomy and Physics at the University of Arizona) on Thursday, 16 June at 9AM.Ībstract: The Event Horizon Telescope has presented the first images of the shadows of the black holes in the Milky Way and in the M87 galaxy. The downside is that it’s in a “chaotic, useless form,” says Hawking, adding: “for all practical purposes the information is lost.”įor now, details are sketchy. This Hawking radiation might be a means for information to escape the black hole. Initially, Hawking thought the photons carried no meaningful information but has since changed his mind. In the 1970s, the same Hawking introduced the concept of Hawking radiation – photons emitted by the black hole itself due to quantum fluctuations. Think of a black hole as a paper shredder documents are ripped to pieces and become unreadable, but if put all the paper strings together it’ll make sense. If the information can be stored, can it be read? Theoretically, if you could tap this information somehow you would be able to reconstruct all the events that caused matter to plunge into the black hole. “Nobody really understands the details of how this happens – this is what Hawking is trying to work out and what other related ideas ‘fuzzball’ and ‘firewall’ explore too,” Prof Marika Taylor, a theoretical physicist at the University of Southampton, told BBC News. A hologram is a 2D description of a 3D object. At this boundary layer, the information is stored as a 2D hologram or super translation. Instead, it’s trapped at the event horizon – the boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole.
Hawking says that the information isn’t destroyed by a black hole because it never makes through inside. This is the information paradox, as physicists call it. This hypothesis, however, contradicts Einstein’s theory of general relativity which suggests the information should be destroyed by a black hole. A consequence of this rule is that information should never disappear, not even if the matter or energy it’s linked to is being sucked by a black hole. Quantum mechanics dictates that anything – that is, matter and energy – can be broken down into information, strings of 1s and 0s for instance. Eminent British physicists, Stephen Hawking, suggests however that information is still retained at the boundary of black holes, known as the event horizon - an amazing new black hole fact! Image: The Guardian Nothing can escape a black hole, not even light, any scientists schooled in modern physics will tell you.
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