"From undirected to directed networks of dynamical agents"

Today's SFI Seminar from @robinus88 (@UCSantaBarbara), streaming now:


(Follow this 🧵 for highlights and select slides)
"[This is] the main question when we talk about power grids...it could be water, it could be gas, it could be opinions transmitted over social media:"

- @robinus88 (@UCSantaBarbara), streaming now:
"We want to keep the right-hand side of this equation as close to zero as possible. What happens if you produce too much, the frequency increases, which we don't want for a variety of reasons."

- @robinus88 (@UCSantaBarbara), streaming now:

#electricity
"What happens if we turn on the accelerator at @CERN *and* many people turn on their lights at the same time? All the turbines slow down and the kinetic #energy is taken from the turbines...after a few seconds, a new power source is commissioned."

- @robinus88 (@UCSantaBarbara):
In undirected systems, flow is not conserved and average velocity is state-/time-dependent.
/
In a directed network of dynamical agents, consider directed incidence matrices:

@robinus88 (@UCSantaBarbara) on #synchronization #oscillation #systems
"We have no guarantee that the Eigenvalues are real anymore..."

- @robinus88 (@UCSantaBarbara):
On calculating winding numbers and winding vectors (partitioning the state space)

"The reason this is important to me is that this partition is naturally induced by the...underlying network structure of the system."

- @robinus88 (@UCSantaBarbara):

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More from @sfiscience

Apr 18
‘The crux of the problem, in my view, is that understanding language requires understanding the world, and a machine exposed only to language cannot gain such an understanding."
- SFI's @MelMitchell1 in @QuantaMagazine, cited by @stevenbjohnson in @NYTmag:
nytimes.com/2022/04/15/mag…
‘‘Consider what it means to understand ‘The sports car passed the mail truck b/c it was going slower.’ You need to know what sports cars & mail trucks are, that cars can ‘pass’ one another, and that vehicles exist & interact in the world, driven by humans w/ their own agendas.’’
"Embodied, Situated, and Grounded #Intelligence: Implications for #AI"

Along w/ SFI's @MelanieEMoses & Tyler Millhouse, @MelMitchell1 just organized a four-day workshop at SFI to address the very problems she brings up in @stevenbjohnson's @NYTmag article.

Stay tuned for more! Image
Read 4 tweets
Apr 18
"'The #energy that flows through a system acts to organize that system,' Harold Morowitz wrote in 1968. Decades later he would team up with physicist Eric Smith at SFI, and the collaboration would lay out a new theory of #abiogenesis."

@BobbyAzarian:
rawstory.com/darwin-2657159…
"According to Smith & Morowitz, life emerged b/c Earth’s geochemistry created an excess of chemical energy. Organic chemistry self-organize[s] when sufficient energy [flows] through the system. Given enough time, a self-maintaining chemical system emerges that can copy itself."
"'If life in its abundance were bound to arise, not as an incalculably improbable accident, but as an expected fulfillment of the natural order,' writes origins-of-life pioneer Stuart Kauffman of the Santa Fe Institute, 'then we truly are at home in the universe.'"
Read 5 tweets
Mar 31
1/n 🧵 ICYMI "Scaling of Hunter-Gatherer Camp Size and Human Sociality"

New paper (@UChicagoPress) led by José Lobo (@ASU) & co-authored by a team incl. SFI's @BettencourtLuis (@miurbanchicago) & Scott Ortman (@CUBoulder), result of an SFI working group:
journals.uchicago.edu/doi/10.1086/71… Image
2/n
This new research deploys #ScalingLaw insights to understand the population-density driven transition from temporary hunter-gatherer settlements to permanent sedentary city life.

Image
3/n
Previous research on the impact of densification on the transition into city life has yielded conflicting results, some suggesting that hunter-gatherer groups actually thin out as they scale. (In what ways might this reflect transitions in the scaling of microbial organisms?) Image
Read 15 tweets
Mar 23
It's good to be back! Follow this thread for the video stream & live coverage of tonight's first SFI Community Lecture at @TheLensic in two years, featuring @Sara_Imari on the #physics of living #systems.
And stay tuned for an extraordinary lineup of additional talks this year...
Live stream starts in one minute!
SFI's @ChrisKempes introduces tonight's speaker @Sara_Imari (@sfiscience, @beyond_asu) by quoting #HaroldMorowitz about how, to find life beyond Earth, we must understand the *origins* of life...
Read 28 tweets
Mar 22
💉 Without mandates, people’s opposition to #vaccines was softer than one might guess — only 3.3% of those surveyed. With mandates, resistance quintupled, to 16.5%.

New research by inbound SFI Fellow Katrin Schmelz (@UniKonstanz) & SFI Prof Samuel Bowles:
santafe.edu/news-center/ne…
"Opposition to voluntary and mandated #COVID19 #vaccination as a dynamic process: Evidence and #policy implications of changing #beliefs"

by Katrin Schmelz & Samuel Bowles

Read the paper in @PNASNews:
pnas.org/doi/10.1073/pn…
“To increase and sustain vaccination rates, change people’s beliefs, and build trust. People have to feel that the guidance they’re getting from the government makes sense and is reliable. And it’s key to get the word out that the vaccines really work.”
– Katrin Schmelz
Read 5 tweets
Mar 21
“We looked at the price of #coal over 140 years. Mines are much more sophisticated, the technology for locating new deposits is much better. Prices have not come down.”
- SFI's Doyne Farmer (@INETOxford)

@billmckibben on #Petro v #CleanEnergy @NewYorker:
newyorker.com/news/essay/in-…
For more on the #CleanEnergy transition, check out this press release, 44-page report, and video presentation on the science and economics supporting the argument for NM to make the leap — authored by SFI Profs Blumsack, Hines, Moore, and Trancik:

santafe.edu/research/proje…
And for more Doyne Farmer, check out our conversation with him last year on #ComplexityPodcast, in which we discuss his work on the declining cost of #WindPower & #Solar (but not #Nuclear) in the broader frame of #ComplexityEconomics:

complexity.simplecast.com/episodes/56
Read 4 tweets

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