{"id":262,"date":"2018-05-03T15:34:36","date_gmt":"2018-05-03T15:34:36","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=262"},"modified":"2018-05-29T23:41:32","modified_gmt":"2018-05-29T23:41:32","slug":"i-opened-a-bottle-with-stephen-hawking-to-celebrate-our-eureka-moment-prof-thomas-hertog","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/262\/i-opened-a-bottle-with-stephen-hawking-to-celebrate-our-eureka-moment-prof-thomas-hertog\/","title":{"rendered":"‘I opened a bottle with Stephen Hawking to celebrate our eureka moment’ \u2013 Prof. Thomas Hertog"},"content":{"rendered":"
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A theory developed with the late Professor Stephen Hawking stating that the universe is more simple and uniform than current models suggest was so shocking that it had to be sat on for a while before it was released to the world, according to co-author Professor Thomas Hertog from KU Leuven in Belgium.<\/strong><\/h3>\n<\/div>\n
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He and Prof. Hawking used an obscure branch of mathematics called string theory to study the Big Bang itself. In a\u00a0paper published on\u00a02 May<\/a>, they propose that instead of there being infinite universes, there is actually a rather limited variety, all of which have the same laws of physics as our own.<\/p>\n

What question are you and the late Stephen Hawking addressing with this theory?<\/strong><\/p>\n

\u2018We are trying to get a model of the Big Bang. Why do we want that? Because we want to understand what kind of universe can emerge from the Big Bang, what kind of universe can come into existence, and what\u2019s special about our universe.\u2019<\/p>\n

What is new about the model proposed in your paper?<\/strong><\/p>\n

\u2018The prevailing theory of the Big Bang says that there are many Big Bangs, creating many different kinds of universes \u2013 which people called the multiverse. We are very much reducing that multiverse. Our new theory of the Big Bang makes our universe more unique again. So that\u2019s why it\u2019s different.\u2019<\/p>\n

Does it bring us closer to the much sought-after \u2018theory of everything\u2019 \u2013 a master theory to link together all the physical aspects of the universe?<\/strong><\/p>\n

\u2018It\u2019s one step in a much bigger programme to come to a fully-fledged view of the Big Bang based, ultimately, perhaps, on a theory of everything.\u2019<\/p>\n

How does this theory comply with the notion of an initial singularity \u2013 a single point of infinite density which contained all the matter in the universe \u2013 at the Big Bang?<\/strong><\/p>\n

\u2018With Einstein\u2019s Theory of Relativity, you can show that the universe had a beginning, that it had a Big Bang, but you couldn\u2019t show anything about how it had begun because the Big Bang was a singularity. We are introducing new techniques from string theory to be able to say something about that beginning so we\u2019re going beyond Einstein\u2019s theory.\u2019<\/p>\n

\u2018Loosely speaking, you could say that this is a theory of what used to be the singularity in Einstein\u2019s theory. It\u2019s a theory that describes how time emerges from something more abstract and timeless.\u2019<\/p>\n

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‘Gravitational waves from the Big Bang are, in my view, one of the key observables we can use to test the theory.’<\/p>\n

Professor Thomas Hertog, KU Leuven, Belgium<\/p>\n<\/blockquote>\n<\/div>\n

What was on the other side of the Big Bang?<\/strong><\/p>\n

\u2018Absolutely nothing.\u2019<\/p>\n

Nothing we can know, or nothing that there is?<\/strong><\/p>\n

\u2018I looked for something in my theory and I didn\u2019t find anything. There is no other side because we used the technique from string theory called holography, so everything which might exist before or on the other side is projected on to the surface at the beginning. There is literally nothing.<\/p>\n

\u2018In all my equations, the other side \u2013 or before the Big Bang as you would say \u2013 is just simply not there. There\u2019s no notion of time.\u2019<\/p>\n

Is there a relic gravitational wave echoing out there from the Big Bang that we have not detected yet?<\/strong><\/p>\n

\u2018The universe arises with a short burst of inflation in our theory and that comes together with gravitational waves. Their relics, as you say, should leave their imprint on the polarisation of the cosmic microwave background radiation.<\/p>\n

\u2018Gravitational waves had not been detected when we began this work. With future technologies and satellites we might hope to see gravitational waves from the Big Bang which are, in my view, one of the key observables we can use to test the theory.<\/p>\n

\u2018Those gravitational waves from the Big Bang are the holy grail of the field of gravitational wave astronomy. And the hardest ones to get.\u2019<\/p>\n

What can studying the Big Bang tell us about the world today?<\/strong><\/p>\n

\u2018We study the Big Bang in order to get a deeper understanding of what we see, how the laws of physics arise, why they are what they are and whether they\u2019re unique. That\u2019s the basic motivation for our work.<\/p>\n

\u2018All these features which characterise the world today, they didn\u2019t exist forever, they (crystallised) after the Big Bang when the universe expanded and cooled. So there must be some process, some physical conditions at the Big Bang which describe how this happened.\u2019<\/p>\n

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\"Thomas
Thomas Hertog and Stephen Hawking spent years collaborating on a new theory of the Big Bang. Image credit – Stephen Hawking<\/figcaption><\/figure>\n<\/div>\n

Describe the feeling you had when you realised that your observation changed the global picture of the universe? Was it a \u2018eureka\u2019 moment?<\/strong><\/p>\n

\u2018With Stephen, yeah sure, we opened a bottle. A eureka moment is evidently very special and rare. This one happened a while ago. The result was, in a way, so shocking that we sat on it for a while and gathered more evidence and looked at the problem from different angles before we decided to go ahead and proceed towards publication.\u2019<\/p>\n

Your work on holographic quantum cosmology is currently funded by the EU\u2019s European Research Council. What\u2019s next?<\/strong><\/p>\n

\u2018Like every discovery (in) theoretical sciences, on the one hand it\u2019s a milestone, but on the other hand, it raises more questions than it answers. The model we propose must be worked out and refined, developed further. I\u2019m curious to see where this will take us.<\/strong>\u00a0Our paper ends with a conjecture and a lot of further development is needed, I believe, before we will know this is the way the universe came to be. So there\u2019s plenty of work to do.\u2019<\/p>\n

Originally published on Horizon<\/a>.\u00a0<\/i><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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