That pretty line above is from poet Muriel Rukeyser, and it’s used skillfully by physicist Sean Carroll in his keynote speech at the 2013 American Humanist Association Conference in San Diego just a few days ago. The talk is titled “Purpose and the Universe” and if you’ve never heard Carroll lecture before, I recommend sitting down for an hour and giving him a listen. He’s entertaining, likable, and has a knack for lucidly explaining concepts like quantum field theory in just a few slides.
Highlights for me included:
- Carroll’s claim that the “laws of physics underlying the experiences of our everyday lives are completely known.” He’s of course not saying that physics is done or that there aren’t undiscovered particles or fields, but that we do know a complete regime of physics, and anything else we discover won’t have any real application to our lives. He explains exactly how we know that, and why we can rule out certain alternatives (assuming quantum field theory is correct). The completeness of this regime has obvious explanatory power, and can absolutely demolish particular claims that would require a different set of physical laws – one obvious one is astrology and another, which is equally implied by the laws but harder for many to accept, is life after death (see this blog post by Carroll for more on that).
- Carroll’s disagreement with many of his atheist/humanist colleagues that science will be able to supply answers to questions of purpose, right and wrong, and ultimate meaning. These concepts, Carroll thinks, must be judged more practically and cannot be reduced to the laws of physics (though any answers we come up with certainly shouldn’t be incompatible with the laws of physics).
- Learning that the underlying reality of the universe is made up not of particles but of waves and fields. The act of observation distorts the field in a certain way so that we “see” particles, though at its base nature is simply a collection of vibrating fields.
- Special guest Richard Dawkins (who was in town to moderate a panel on “Religion as Child Abuse”) asking a question at 1:00:56 and making a slight correction to one of Carroll’s slides. How cheeky.