l24 - ISP209s10 Lecture 24-1- Today Announcements: HW#10 is...

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Unformatted text preview: ISP209s10 Lecture 24-1- Today Announcements: HW#10 is due Fri 4/23 8:00 am Exam #3 Thurs. April 29 Final Exam will be on CAPA (take-home) What is Matter? What is Mass? Dark Matter and Dark Energy ISP209s10 Lecture 24-2- Standard Model The fundamental theory of natures constituents and their interaction is called the Standard Model The theory includes: Strong interactions due to the color charges of quarks and gluons. A combined theory of weak (weak charge) and electromagnetic interaction (charge), known as electroweak theory. The theory does not include the effects of gravity. Gravity is tiny compared to the other forces. We also dont have a quantum theory of gravity. ISP209s10 Lecture 24-3- Standard Model Particles Charge +2/3-1/3 Anti- particles have the opposite charge. ISP209s10 Lecture 24-4- Problems with the Standard Model Why so many particles? Why 3 generations? Are there more particles we dont know about yet? What is charge? Why does it come in fixed units? Same for lepton number and baryon number Why is the standard model so complicated? Why 4 forces? Why is gravity so weak? In general the standard model does not answer the WHY question. Everyone agrees it is not a complete ISP209s10 Lecture 24-4- Problems with the Standard Model Why so many particles? Why 3 generations? Are there more particles we dont know about yet? What is charge? Why does it come in fixed units? Same for lepton number and baryon number Why is the standard model so complicated? Why 4 forces? Why is gravity so weak? In general the standard model does not answer the WHY question. Everyone agrees it is not a complete theory. ISP209s10 Lecture 24-5- What is matter Matter is the collection of objects made of baryons...
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This note was uploaded on 05/04/2010 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.

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l24 - ISP209s10 Lecture 24-1- Today Announcements: HW#10 is...

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