[sotd] String Theory and Extra Dimensions - Physics for the 21st Century [August 22, 2012]
- From: "Site of the Day" <amholm@xxxxxxxxxxx>
- To: sotd@xxxxxxxxxxxxx
- Date: Wed, 22 Aug 2012 09:34:30 -0300
Site of the Day for Wednesday, August 22, 2012
String Theory and Extra Dimensions - Physics for the 21st Century
Today's site, a collaborative project of the Harvard-Smithsonian Center for
Astrophysics Science Media and Harvard's Physics Department under the
umbrella of the Annenberg organization, offers the fourth in a series of
fundamental physics topics. Gentle Subscribers will find an excellent
presentation on string theory designed with the non-scientist in mind.
"Introduced in the mid-1970s, the string concept has stimulated a great
deal of theoretical excitement even though it has no connection to
experiment so far. The unit introduces string theory in the context of
quantum gravity and outlines its inherent multidimensional nature; the most
promising approach involves a total of ten dimensions. The unit then covers
the relationship of string theory to particle physics and ... focuses on
cosmological issues arising from our understanding of the Big Bang ..." -
from the website
The String Theory unit provides both video and text to explain the
underpinnings of the concept, with notes on quantum mechanics and gravity
and the problem of "quantum gravity". Sections delve into extra dimensions
with particle physics and the hierarchy problem, while the intriguingly
titled "Cosmic Serpent" considers the issues attendant to changes in short
distance physics. Additional features include a number of illustrative
animations, a glossary linked to terms specific to string theory, along
with interviews with contributing scientists from Princeton, Stanford, and
Cornell.
Slip over to the site for an excellent exhibit on one of physics most
significant theories at:
http://www.learner.org/courses/physics/unit/text.html?unit=4&secNum=0
A.M. Holm
Comments? Suggestions? <amholm@xxxxxxxxxxx>
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