Andrew Jaffe
@defjaf.bsky.social
Astrophysics, cosmology, Bayesian inference, parenthood, politics, rock ’n’ roll, & more. Professor at Imperial College. andrewjaffe.net He/him/his
The Random Universe—coming in November. https://yalebooks.yale.edu/book/9780300250503/the-random-universe/
The Random Universe—coming in November. https://yalebooks.yale.edu/book/9780300250503/the-random-universe/
The other problem with teaching at 5pm is that I spend the whole afternoon beforehand thinking about my lecture.
January 16, 2026 at 6:01 PM
The other problem with teaching at 5pm is that I spend the whole afternoon beforehand thinking about my lecture.
I’m on my colleague Brian Keating’s Into the Impossible podcast discussing The Random Universe. Please listen! (Apple Podcasts; YouTube; Spotify)
January 13, 2026 at 1:33 PM
I’m on my colleague Brian Keating’s Into the Impossible podcast discussing The Random Universe. Please listen! (Apple Podcasts; YouTube; Spotify)
5pm Fridays is not the best time to lecture.
January 9, 2026 at 5:02 PM
5pm Fridays is not the best time to lecture.
If you’ve read — and learned from — The Random Universe, please consider leaving a rating or a review at the site of your choice.
January 8, 2026 at 5:12 PM
If you’ve read — and learned from — The Random Universe, please consider leaving a rating or a review at the site of your choice.
First undergraduate cosmology lecture in about 13 years. Too many slides today, but looking forward to 25 lectures of good old-fashioned chalk-and-talk.
January 6, 2026 at 4:06 PM
First undergraduate cosmology lecture in about 13 years. Too many slides today, but looking forward to 25 lectures of good old-fashioned chalk-and-talk.
Holiday buns. Finally perfected with the third batch of the season. (6/12)
December 25, 2025 at 12:54 PM
Holiday buns. Finally perfected with the third batch of the season. (6/12)
Our first sourdough…
December 23, 2025 at 9:27 AM
Our first sourdough…
I’m on a new podcast, Science for Fiction, hosted by my Imperial colleague, and fellow author, David Clements, discussing my book, The Random Universe.
December 19, 2025 at 6:53 AM
I’m on a new podcast, Science for Fiction, hosted by my Imperial colleague, and fellow author, David Clements, discussing my book, The Random Universe.
New appearance on my Imperial colleague and fellow author Dave Clements’ new podcast, Science for Fiction!
Science for Fiction has now made the leap to cyberspace as the Science for Fiction podcast, made in conjunction with the @sffoundation.bsky.social The first episode is me interviewing @defjaf.bsky.social about his new book The Random Universe. Have a listen! apple.co/44A5GIg
Science for Fiction
Science Podcast · Real science that inspires science fiction, from the latest in cosmology to the strangest biology. Brought to you by the Science Fiction Foundation.
apple.co
December 18, 2025 at 11:48 PM
New appearance on my Imperial colleague and fellow author Dave Clements’ new podcast, Science for Fiction!
Podcast appearance: I discuss The Random Universe on The New Books Network with host Gregory McNiff.
November 25, 2025 at 9:38 PM
Podcast appearance: I discuss The Random Universe on The New Books Network with host Gregory McNiff.
We want to make sourdough. Should I buy starter, or try to make my own?
November 25, 2025 at 4:54 AM
We want to make sourdough. Should I buy starter, or try to make my own?
Thrilling to see The Random Universe in the real world.
November 24, 2025 at 8:32 AM
Thrilling to see The Random Universe in the real world.
The Random Universe IRL!
Good to see @defjaf.bsky.social new book - the Random Universe - out in the wild. Heffers in Cambridge.
November 19, 2025 at 8:04 PM
The Random Universe IRL!
Reposted by Andrew Jaffe
Come hear us talk about the first moments in the history of the Universe, part of Imperial Lates at Imperial College in South Kensington, London.
What happened in the first second of the universe?
Journey back nearly 14 billion years to the very first moments after the Big Bang.
www.imperial.ac.uk
November 19, 2025 at 4:52 PM
Come hear us talk about the first moments in the history of the Universe, part of Imperial Lates at Imperial College in South Kensington, London.
Come hear us talk about the first moments in the history of the Universe, part of Imperial Lates at Imperial College in South Kensington, London.
What happened in the first second of the universe?
Journey back nearly 14 billion years to the very first moments after the Big Bang.
www.imperial.ac.uk
November 19, 2025 at 4:52 PM
Come hear us talk about the first moments in the history of the Universe, part of Imperial Lates at Imperial College in South Kensington, London.
Grateful to the colleagues, friends, students, and others who showed up for The Random Universe launch last night, and to Imperial College and Yale University Press for sponsoring and enabling the event.
The Random Universe - Yale University Press London
An award-winning astrophysicist looks at how the understanding of uncertainty and randomness has led to breakthroughs in our knowledge of the cosmos A...
yalebooks.co.uk
November 19, 2025 at 7:07 AM
Grateful to the colleagues, friends, students, and others who showed up for The Random Universe launch last night, and to Imperial College and Yale University Press for sponsoring and enabling the event.
First batch of winter buns.
November 17, 2025 at 9:10 PM
First batch of winter buns.
Listening to A History of Rock Music in 500 Songs on the Richmond origins of The Yardbirds while riding the 65 London bus through Richmond.
Episode 126: “For Your Love” by the Yardbirds
Episode 126 of A History of Rock Music in Five Hundred Songs looks at “For Your Love”, the Yardbirds, and the beginnings of heavy rock and the guitar hero. Click the full post to read liner …
500songs.com
November 17, 2025 at 9:43 AM
Listening to A History of Rock Music in 500 Songs on the Richmond origins of The Yardbirds while riding the 65 London bus through Richmond.
The good news: The Random Universe is the “#1 New Release in Cosmology”.
The bad news: a friend and cosmology colleague has found the first error in the book.
The bad news: a friend and cosmology colleague has found the first error in the book.
November 15, 2025 at 10:10 AM
The good news: The Random Universe is the “#1 New Release in Cosmology”.
The bad news: a friend and cosmology colleague has found the first error in the book.
The bad news: a friend and cosmology colleague has found the first error in the book.
Today in the NY Times: Lisa Lucas’ love letter to Leiden, one of the intellectual capitals of Europe.
November 12, 2025 at 10:43 AM
Today in the NY Times: Lisa Lucas’ love letter to Leiden, one of the intellectual capitals of Europe.
I talk about The Random Universe (the book, and the Universe itself) on [Sean Carroll's Mindscape. We cover epistemology, probability, quantum mechanics, cosmology and more. Sean and I were cosmology grad students at the same time, and it was a pleasure and an honour to spend time with him online.
335 | Andrew Jaffe on Models, Probability, and the Universe – Sean Carroll
www.preposterousuniverse.com
November 11, 2025 at 10:54 AM
I talk about The Random Universe (the book, and the Universe itself) on [Sean Carroll's Mindscape. We cover epistemology, probability, quantum mechanics, cosmology and more. Sean and I were cosmology grad students at the same time, and it was a pleasure and an honour to spend time with him online.
Reposted by Andrew Jaffe
in this week’s Mindscape, as @seanmcarroll.bsky.social talks with
@defjaf.bsky.social about “Models, Probability, and the Universe”, I learned that in Jaffe’s (and others’) model, the Hubble constant is 67.
kids today might be either thrilled or deflated by this value.
I myself would prefer 42.
@defjaf.bsky.social about “Models, Probability, and the Universe”, I learned that in Jaffe’s (and others’) model, the Hubble constant is 67.
kids today might be either thrilled or deflated by this value.
I myself would prefer 42.
November 10, 2025 at 2:02 PM
in this week’s Mindscape, as @seanmcarroll.bsky.social talks with
@defjaf.bsky.social about “Models, Probability, and the Universe”, I learned that in Jaffe’s (and others’) model, the Hubble constant is 67.
kids today might be either thrilled or deflated by this value.
I myself would prefer 42.
@defjaf.bsky.social about “Models, Probability, and the Universe”, I learned that in Jaffe’s (and others’) model, the Hubble constant is 67.
kids today might be either thrilled or deflated by this value.
I myself would prefer 42.
The Random Universe isn’t out until tomorrow (November 11), but the Kindle edition is on sale in both the US and in the UK. (And if you look very carefully, you’ll see that it has broken into the top 100 UK cosmology bestsellers…)
November 10, 2025 at 12:55 PM
The Random Universe isn’t out until tomorrow (November 11), but the Kindle edition is on sale in both the US and in the UK. (And if you look very carefully, you’ll see that it has broken into the top 100 UK cosmology bestsellers…)
Unboxing The Random Universe youtube.com/shorts/tvQJh...
Unboxing The Random Universe
YouTube video by Andrew Jaffe
youtube.com
November 5, 2025 at 6:23 PM
Unboxing The Random Universe youtube.com/shorts/tvQJh...