Speaker
Prof.
Cliff Burgess
(McMaster University & Perimeter Institute)
Description
We live at a time of contradictory messages about how successfully we understand gravity. General Relativity seems to work very well in the Earth’s immediate neighbourhood, but arguments abound that it needs modification at very small and/or very large distances. This talk tries to put this discussion into the broader context of similar situations in other areas of physics, and summarizes some of the lessons which our good understanding of gravity in the solar system has for proponents for its modification over very long and very short distances. The main message is that effective theories (in the technical sense of effective) provide the natural (and arguably only known) precise language for framing proposals. Its framework is also useful, inasmuch as it makes some modifications seem more plausible than others, though there are also some surprises.
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| Overview or Regular Talk? | Overview: 75 min. |
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Author
Prof.
Cliff Burgess
(McMaster University & Perimeter Institute)
