Perhaps someone with a lot of patience would help me.(adsbygoogle = window.adsbygoogle || []).push({});

I am watching Roger Penrose Clocks at the Big Bang 09/30/2008 on PIRSA

http://streamer.perimeterinstitute.ca/mediasite/viewer/NoPopupRedirector.aspx?peid=940fba57-4cf9-4659-9c2d-1324d45cf4e4&shouldResize=False# [Broken]

At about 37 minutes slide 43 shows a light cone. The slide is headed Clock in Relativity. The statement I would like to better understand is that the metric g(ab) has 10 components, one of which is scale, the other 9 specify location of the light cone.

I think I get it that the metric g(ab) is a 3x3 matrix, with nine co-efficients. But I don’t get the scale component.

Thanks for any guidance.

Richard

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# Light cone question

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