18 | Clifford Johnson on What's So Great About Superstring Theory

18 | Clifford Johnson on What's So Great About Superstring Theory

String theory is a speculative and highly technical proposal for uniting the known forces of nature, including gravity, under a single quantum-mechanical framework. This doesn't seem like a recipe for creating a lightning rod of controversy, but somehow string theory has become just that. To get to the bottom of why anyone (indeed, a substantial majority of experts in the field) would think that replacing particles with little loops of string was a promising way forward for theoretical physics, I spoke with expert string theorist Clifford Johnson. We talk about the road string theory has taken from a tentative proposal dealing with the strong interactions, through a number of revolutions, to the point it's at today. Also, where all those extra dimensions might have gone. At the end we touch on Clifford's latest project, a graphic novel that he wrote and illustrated about how science is done. Clifford Johnson is a Professor of Physics at the University of Southern California. He received his Ph.D. in mathematics and physics from the University of Southampton. His research area is theoretical physics, focusing on string theory and quantum field theory. He was awarded the Maxwell Medal from the Institute of Physics. Johnson is the author of the technical monograph D-Branes, as well as the graphic novel The Dialogues. Home page Wikipedia page Publications A talk on The Dialogues Asymptotia blog Twitter

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119 | Musa al-Gharbi on the Value of Intellectual Diversity

119 | Musa al-Gharbi on the Value of Intellectual Diversity

In the service of seeking truth, there would seem to be value in intellectual diversity, both in keeping ourselves honest and in the possibility of new ideas coming from unexpected quarters. That's tr...

19 Loka 20201h 16min

118 | Adam Riess on the Expansion of the Universe and a Crisis in Cosmology

118 | Adam Riess on the Expansion of the Universe and a Crisis in Cosmology

Astronomers rocked the cosmological world with the 1998 discovery that the universe is accelerating. Well-deserved Nobel Prizes were awarded to Saul Perlmutter, Brian Schmidt, and today's guest Adam R...

12 Loka 20201h 18min

117 | Sean B. Carroll on Randomness and the Course of Evolution

117 | Sean B. Carroll on Randomness and the Course of Evolution

Evolution is a messy business, involving as it does selection pressures, mutations, genetic drift, and the effects of random external interventions. So in the end, how much of it is predictable, and h...

5 Loka 20201h 20min

116 | Teresa Bejan on Free Speech, Civility, and Toleration

116 | Teresa Bejan on Free Speech, Civility, and Toleration

How can, and should, we talk to each other, especially to people with whom we disagree? "Free speech" is rightfully entrenched as an important value in liberal democratic societies, but implementing i...

28 Syys 20201h 43min

115 | Netta Engelhardt on Black Hole Information, Wormholes, and Quantum Gravity

115 | Netta Engelhardt on Black Hole Information, Wormholes, and Quantum Gravity

Stephen Hawking made a number of memorable contributions to physics, but perhaps his greatest was a puzzle: what happens to information that falls into a black hole? The question sits squarely at the ...

21 Syys 20201h 27min

114 | Angela Chen on Asexuality in a Sex-Preoccupied World

114 | Angela Chen on Asexuality in a Sex-Preoccupied World

Sexuality is, and always has been, a topic that is endlessly fascinating but also contentious. You might think that asexuality would be more straightforward, but you'd be wrong. Asexual people, or "ac...

14 Syys 20201h 8min

113 | Cailin O'Connor on Game Theory, Evolution, and the Origins of Unfairness

113 | Cailin O'Connor on Game Theory, Evolution, and the Origins of Unfairness

You can't always get what you want, as a wise person once said. But we do try, even when someone else wants the same thing. Our lives as people, and the evolution of other animals over time, are shape...

7 Syys 20201h 19min

112 | Fyodor Urnov on Gene Editing, CRISPR, and Human Engineering

112 | Fyodor Urnov on Gene Editing, CRISPR, and Human Engineering

Not too long ago nobody carried a mobile phone; now almost everybody does. That's the kind of rate of rapid progress we're seeing with our ability to directly edit genomes. With the use of CRISPR-Cas9...

31 Elo 20201h 20min

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