Do we need String Theory for Quantum Gravity? - Lance Dixon (SETI Talks)
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Uploaded by setiinstitute on Sep 25, 2011
SETI Talks Archive: http:seti.org/talks
The strong, weak, and electromagnetic interactions all have consistent, relativistic and quantum mechanical descriptions in terms of pointlike particles, but Einstein's theory of gravitation has long resisted a similar treatment, because of severe ultraviolet divergences. String theory solves these problems, but it introduces a new length scale, perhaps 16 orders of magnitude below what can be tested experimentally.
Dr. Dixon will describe recent theoretical progress in showing that a particular pointlike theory of gravity, called N=8 supergravity, might also be quantum mechanically consistent. In particular, N=8 supergravity has been shown explicitly to have no ultraviolet divergences in perturbation theory through the four-loop order. Dr. Dixon will also discuss the possible implications of these results.
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@sonicase curvatarure of space time is equivalent to gravity in general relativity, hence gravity affects photons (which are massless). String theory is simply a tool used to incorporate gravity into QM, it requires no evidence for its actual existence, only that it agrees with data.
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he says gravity has an effect on all particles, however there are massless particles (gauge bosons). i know light can be bent around a large mass like a star but i think space is just curved around it. so it's not really the gravity.
i'm a particle physics noob but that part seemed a little iffy.
there's been no real evidence for string theory(i think). it makes me wonder if we're over complicating the situation like astronomers were over complicating the movement of the planets before kepler
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I'm impressed that theoretical particle physicists have mastered the art of hovering presentation screens that *look* as though they've been added in post production!
PelicanGodOfJupiter 5 months ago
@PelicanGodOfJupiter Yes, it takes alot of Strings to pull off this illusion. :-)
setiinstitute 5 months ago