Before the Big Bang 3: String Theory Cosmology
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This series of films explores current views from leading scientists on what may have happened before the big bang. In our first film in this series we interviewed Abhay Ashtekar the father of loop quantum gravity and loop quantum cosmology to see what it had to say about the nature of the big bang. In this film, we look at some of the approaches inspired by string theory. Here we interview the father of string theory, Gabriele Veneziano, also one of the first to try and apply it to the big bang. But string theory has more than one approach to the issue of what was before the big bang, if anything. So in this film we also interview David Wands, Professor of Cosmology and Director of the Institute of Cosmology and Gravitation at the University of Portsmouth, who has reviewed several string inspired models. Professor Mairi Sakellariadou of King’s College London who specialises in applying quantum gravity models to the early universe. Lastly, Ali Nayeri, who works on a model of the universe known as “string gas cosmology”. As in our previous films we discuss some of the challenges these theories face, and how they might be experimentally tested. As well as looking at other issues such as is there a mulitverse and did the universe have a beginning? All of the scientists who were interviewed for the film were given a draft for any corrections or clarifications. All approved it for publication. One additional clarification Mairi Sakellariadou wanted to add was “My discussion about space-time dimensionality refers to the string gas scenario, namely the decompactification of 3 spatial dimensions (the interplay between winding and momentum modes, the duality between large and small spaces). My paper refers to the brane scenario: within the higher dim bulk, branes of all dim are embedded and as we have shown interactions between branes lead to the decay of higher dim branes while 3dim and 1dim branes remain; one of the former could play the role of our universe while the latter are the so-called cosmic superstrings, the analogues of field theoretical 1dim topological defects, called cosmic strings.” It should be noted that since this film was made the BICEP results were shown to be consistent with dust from foregrounds, rather than gravity waves. Animations provided by Ali Nayeri and Alex Bennett. Music is from Sigur Ros and is used with permission, see their web site FAq , music use: “can i use music by sigur rós in my film or video?”you can use sigur rós's music as long as it won't be used for commercial purposes”.
Comments
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where is Ed witten then?
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The videos about loop quantum gravity and the cyclic universe-model of penrose were much more interesting! But thanks for the upload!
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Thinking is more fun than blindly believing. So let's enjoy and let the mindless do their believing.
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I am a theist, and, I am a fan. Thanks for quality of the subjects!
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Isn't "before" a temporal concept that depends on the existence of time? If the big bang is the point where time begins does it even make sense to talk about a before?
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Scientific theories are distinguished from hypotheses, which are individual empirically testable conjectures, and scientific laws, which are descriptive accounts of how nature will behave under certain conditions. The word "theory" that imply that something is unproven or speculative (which is better characterized by the word 'hypothesis)' in other words a waste of time.
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Dont let GOD find out about this.
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plain and simple,God created the heavens and the earth
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Are strings things? When you find that they fit, do they beget from the fit, or from a pre-Universe Home Depot that had to be got? My only concrete observation from watching this is a sense of expanding intracranial pressure, resulting in a need for aspirin.
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If you are wondering who is viewing this complex scientific video I am a simple, curious 61 year old women in the USA who is grateful to these inspiring giants of physics.
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I wonder what kind of shit you have been smoking to come up with such utter jibberish?. What a waste of money to support people pretending to be doing something constructive when in fact all you are doing is wasting tax payers money on stupid crap that in no way will ever have any effect on the planet. Go put your stupid ass to some good use and study things here on earth that need studying, not speculating on what happened so far back. It has absolutely no useful purpose except to print and preach jibberish!
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Suggestion: Do one with Lee Smolin next.
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Yey! You were in Pompey!
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I have noticed that in your videos, specially those belonging to the BTBB series, the interviewed refer to a 'he' behind the camera. Care to reveal who 'he' is? :-)
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Thank you, skydivephil for your wonderful videos! You are the only one who does these things! Keep it coming!
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This is an excellent informative cutting edge clip that I need to watch again and again to digest it better. And really how much is changed in such a short time, referring to my own classic physic training. How much we know now, or how much we didn't know then... Worrisome, at least concerning is where are we going with this logarithmic scale learned new information, in near future.
This should be broadcast on PBS.
Wonderful presentation and please keep up this wonderful job. -
We don't need the weird religion of modern physics to explain things/phenomena in our universe.
We sense our surroundings and know about the existence of various things/particles in this universe via our sense organs. And our sense organs sense things based upon the patterns of energy stimuli they receive from the environment. So it is only based upon the patterns of energy we receive from the environment that we are aware of the existence of various things in this universe, and beyond the fact that we receive specific patterns of energy stimuli, we really don’t know about the objects or the surroundings which we presume as truly existing. In other words, as far as we know, objects are nothing but energy patterns. And this is not only the case with human sensors but is true with any sensor. A sensor obviously relies upon the patterns of signals (in other words patterns of energy stimuli) that it receives from the surroundings to sense any object whether it is an electron or a ball.
And what is energy at the most fundamental level?
http://debunkingrelativity.com/2014/03/05/double-slit-experiment-electrons/ -
You should talk to some philosophers as well if you are intending to make this about theism. WLC's version of the argument is actually the only one which deals with physics. Others, such as the Thomistic arguments, deal with metaphysics and ignore whether there was a beginning.
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thank you so much for producing these videos - outstanding.
It gives me a warm fuzzy feeling that there are people prepared to go to so much effort just to Educate and share ideas -
I used to listen to that Sigur Ros song all the time, can't remember the name off the top of my head. Which is it?
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