124 | Solo: How Time Travel Could and Should Work

124 | Solo: How Time Travel Could and Should Work

Time! It doesn't stop, psychological effects of being under lockdown notwithstanding. How we experience time depends on our situation, but time itself just marches forward. Unless, of course, it's possible to travel to the past, as countless science-fiction scenarios have depicted. But does that really make sense? Couldn't we then change the past, even so dramatically that our own existence would never have happened? In this solo podcast I talk about both the physics and fiction of time travel. I point out that it might be allowed by the laws of physics, and explain how that would work, but that we really don't know. And I try to make sense of some of the less-sensible depictions of cinematic time travel. Coming up with a logical theory that could account for Back to the Future isn't easy, but podcasting isn't for the squeamish.

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But wait, there's more! I was contacted by Janna Levin, who we fondly remember from Episode 27. Janna moonlights as Chair and Director of Sciences at Pioneer Works, an institution dedicated to bringing together creative people in art and science. Like the rest of us, they've been looking for ways to offer more online content in these pandemic times, so we thought about ways to collaborate. Here's what they came up with: artist Azikiwe Mohammed has created an animated video backdrop to this podcast episode. The visuals are trippy, colorful, and inspired by (without trying to directly illustrate) what I talk about in the episode. You can check out a brief write-up at the Pioneer Works site, or view the video directly below.

https://www.youtube.com/watch?v=kHy1j4LiyGQ

Jaksot(416)

218 | Raphael Bousso on Black Holes and the Holographic Universe

218 | Raphael Bousso on Black Holes and the Holographic Universe

Stephen Hawking's discoveries of black hole radiation, entropy, and the information-loss problem have both taught us an enormous amount about the relationship between quantum mechanics and gravity, an...

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217 | Margaret Levi on Moral Political Economy

217 | Margaret Levi on Moral Political Economy

Why do people voluntarily hand over authority to a government? Under what conditions should they do so? These questions are both timeless and extremely timely, as modern democratic governments struggl...

14 Marras 20221h 21min

AMA | November 2022

AMA | November 2022

Welcome to the November 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Pa...

7 Marras 20223h

216 | John Allen Paulos on Numbers, Narratives, and Numeracy

216 | John Allen Paulos on Numbers, Narratives, and Numeracy

People have a complicated relationship to mathematics. We all use it in our everyday lives, from calculating a tip at a restaurant to estimating the probability of some future event. But many people f...

31 Loka 20221h 10min

215 | Barry Loewer on Physics, Counterfactuals, and the Macroworld

215 | Barry Loewer on Physics, Counterfactuals, and the Macroworld

The founders of statistical mechanics in the 19th century faced an uphill battle to convince their fellow physicists that the laws of thermodynamics could be derived from the random motions of microsc...

24 Loka 20221h 34min

214 | Antonio Padilla on Large Numbers and the Scope of the Universe

214 | Antonio Padilla on Large Numbers and the Scope of the Universe

It's a big universe we live in, so it comes as no surprise that big numbers are needed to describe it. There are roughly 10^22 stars in the observable universe, and about 10^88 particles altogether. B...

17 Loka 20221h 15min

AMA | October 2022

AMA | October 2022

Welcome to the October 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Pat...

10 Loka 20223h 1min

213 | Timiebi Aganaba on Law and Governance in Space

213 | Timiebi Aganaba on Law and Governance in Space

With communication satellites, weather satellites, GPS, and much more, what happens in space is already important to our lives here on Earth. And the importance of space is only going to grow as we in...

3 Loka 20221h 16min

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