l24p - ISP209s7 Lecture 24-1 Today • The nature of the...

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Unformatted text preview: ISP209s7 Lecture 24-1- Today • The nature of the Universe - Beyond the Standard Model – Dark Matter and Dark Energy – String Theory and the quest to unify gravity and quantum theory – Begin watching PBS NOVA special “The Elegant Universe” on String Theory ISP209s7 Lecture 24-2- The goals of science • Reach an understanding based on the fundamental building blocks of nature and their interactions. • Human bias – simple is better; one equation should describe everything (goal of string theory) • The standard model is our current collection of fact. It does not answer the why question. ISP209s7 Lecture 24-3- How do we know what things are made of? Multi-walled carbon nanotube MSU Center for Advanced Microscopy TEM Microscope = 5x10-9 m ISP209s7 Lecture 24-4- The highest magnification possible 0.136nm separation between Si atoms TEM Image of a Silicon crystal http://www.ceo.msu.edu/ MSU Center for Advanced Microscopy Xudong Fan , MSU Image of Si [110] We can see pairs of silicon atoms. ISP209s7 Lecture 24-5- What We Made Of? • We are made out of atoms. The size of atoms is 10-9 m = nm • Atoms are made of nuclei and electrons (+ energy; E=mc 2 ) • Nuclei are made of neutrons and protons (plus the stuff that binds them, mesons) • Neutrons, Protons and Mesons are made of quarks (10-16 m). We can measure down to 10-18 m • What are quarks made of? The answer may be strings,• What are quarks made of?...
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This note was uploaded on 07/25/2008 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.

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l24p - ISP209s7 Lecture 24-1 Today • The nature of the...

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