Can Space Time Keep Memory?

Marketers are increasingly calling out "bull spend," referring to advertising expenditures that yield impressive metrics but fail to translate into meaningful business results. This trend highlights the disconnect between vanity metrics, such as impressions, and actual revenue generation. The conversation emphasizes the need for marketers to focus on metrics that truly impact the bottom line, rather than those that merely look good on dashboards.

In a deeper exploration of gravitational waves, the discussion shifts to the concept of gravitational memory effects, which suggest that space-time can retain a permanent imprint from the passage of these waves. Unlike typical gravitational waves that oscillate and return space-time to its original state, memory effects indicate that some waves can cause lasting changes. These effects, which include displacement memory and velocity kick memory, remain undetected by current observatories like LIGO due to their subtlety and the limitations of existing technology.

The upcoming Laser Interferometer Space Antenna (LISA), scheduled for launch in 2035, is expected to provide the sensitivity needed to detect these elusive memory effects. LISA's design allows for the observation of low-frequency gravitational waves from massive cosmic events, potentially revealing new insights into the nature of gravity and the universe's history. The detection of these memory effects could not only confirm aspects of general relativity but also provide clues about dark matter and the early universe's conditions.

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There are cosmic events so powerful that they leave permanent marks on the fabric of the universe itself. Imagine two colossal black holes spiraling into each other, yes they send ripples in the fabric of spacetime—gravitational waves that we’ve only recently learned to sense. Ripples pass, leaving the pond … or the universe … unchanged when they’re gone. But ripples aren’t the only type of wave. There’s another type of wave that leaves a permanent mark—a memory etched in the fabric of the universe. They’re akin to gravitational tsunamis, and we’re on the verge of being able to detect them.

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Hosted by Matt O'Dowd Written by Christopher Pollack & Matt O'Dowd Post Production by Leonardo Scholzer, Yago Ballarini & Stephanie Faria Directed by Andrew Kornhaber Associate Producer: Bahar Gholipour Executive Producer: Andrew Kornhaber Executive in Charge for PBS: Maribel Lopez Director of Programming for PBS: Gabrielle Ewing Assistant Director of Programming for PBS: John Campbell

Spacetime is a production of Kornhaber Brown for PBS Digital Studios. This program is produced by Kornhaber Brown, which is solely responsible for its content. © 2024 PBS. All rights reserved.

End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/user/MultiDroideka

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Big Bang Wojciech Szymski Bryce Fort Peter Barrett Alexander Tamas Morgan Hough Juan Benet Vinnie Falco Mark Rosenthal

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Hypernova Dean Galvin Michael Tidwell Robert DeChellis Stephen Spidle Chris Webb Massimiliano Pala Justin Lloyd David Giltinan Kenneth See Gregory Forfa Alex Kern Zubin Dowlaty Scott Gorlick Paul Stehr-Green Ben Delo Scott Gray Антон Кочков Robert Ilardi John R. Slavik Donal Botkin Edmund Fokschaner chuck zegar

Gamma Ray Burst Satwik Pani Param Saxena John De Witt Nathaniel Bennett Sandhya Devi Michael Oulvey Arko Provo Mukherjee Mike Purvis Christopher Wade Anthony Crossland Grace Seraph Stephen Saslow Tomaz Lovsin Anthony Leon Lori Ferris Koen Wilde Nicolas Katsantonis Richard Steenbergen Joe Pavlovic Chuck Lukaszewski Cole B Combs Andrea Galvagni Jerry Thomas Nikhil Sharma John Anderson Bradley Ulis Craig Falls Kane Holbrook Ross Story Harsh Khandhadia Michael Lev Rad Antonov Terje Vold James Trimmier Jeremy Soller Paul Wood Kent Durham jim bartosh John H. Austin, Jr. Diana S Faraz Khan Almog Cohen Daniel Jennings Jeremy Reed David Johnston Michael Barton Isaac Suttell Bleys Goodson Mark Delagasse Mark Daniel Cohen Shane Calimlim Tybie Fitzhugh Eric Kiebler Craig Stonaha Frederic Simon Jim Hudson Alex Gan John Funai Adrien Molyneux Bradley Jenkins Vlad Shipulin Justin Waters Thomas Dougherty Zac Sweers Dan Warren Joseph Salomone Julien Dubois ​

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