Before the Big Bang 3: String Theory Cosmology
Δημοσιεύτηκε στις 16 Σεπ 2014
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”.
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”.
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