Queuing up for tonight's sold out (but streaming) Community Lecture by Fractal Faculty Professor @seanmcarroll!
🧵 Follow this thread as we look into Schröedinger's Box with @seanmcarroll (newly appointed to Chair of #NaturalPhilosphy at @johnshopkins) and learn about the #ManyWorlds hypothesis of #QuantumMechanics:

"Even if we're wrong, it's not magic, it's #physics, it's #science, and it can be understood."

"When we look at the world, we don't see the entirety of reality. What reality is, is the #superposition of the many different ways..."

"#Space is one of the many things in #reality."
This is not what the #atom looks like. The Rutherford atom is dramatically unstable and would immediately collapse.
"#QuantumMechanics says the world is made of waves. But when you do the #math, the #waves take shape."
"When you look at #electrons, you don't see #waves. You see #particles."

On a crisis of understanding in #physics:

"They bit the bullet." AND "They all objected to this."
"To #Einstein, quantum mechanics was a step in the right direction, but it wasn't finished yet."

"Uniquely in the history of #physics, we have two sets of rules: one for when you're looking at it, and one when you're not. The textbook picture is clearly unacceptable."
"You can see how a whole INDUSTRY of #quantum healing [etc.] could spring up around this...it's almost as if we're bringing #reality into #existence, like a spooky TV show."

"The problem is that there's no consensus."
On the #DoubleSlitExperiment:

"Even though you're sending the electrons through one by one, they interfere. It's hard for *representations* of reality to interfere. The #WaveFunction is a real thing."
"What you will see if you look for particle number 1 is that it's moving in a certain direction...if you see one particle moving in a certain direction, the other must be moving in the other direction, b/c of the conservation of #momentum. You would instantly know." #Entanglement
"What the wave function is doing is assigning a number to the location that any possible configuration the particles could be in. There's only one wave function, and so it's not like a wave propagating through 3-d space. It's an assignment of possibility..."
(Stray electron got into that Schrödinger up there... 😏)
"Hugh Everett said...all the wave function ever does is behave the Schrödinger interpretation. This is his legacy."
"For some reason, observers were supposed to be treated classically. No questions are permitted at this time."

"Everett called his theory the Theory of the Universal Wave Function: Everything is quantum, so there's a wave function that describes both the cat & the observer."
BUT "You always perceive a definite measurement outcome."

Enter #Decoherence: entangle the quantum system with its environment.

"You might think, 'I'm not sure how this helps things.' At no point did you think, 'You know what would be awesome? If there were a million worlds."
"The possibility of a superposition of many, #ManyWorlds was always there as long as you know there was a wave function. The question was whether you let them be real. Every other interpretation was the Getting Rid of #Worlds Interpretation."
"Arguably, the Everett interpretation is the ONLY one in which #energy is being conserved, because the universe is getting thinner. But you don't notice, b/c—and here's the good news—you are getting thinner."
"There is really no ethical, moral, or philosophical impact...the fact that there are many copies of you gives you the same utility function."
"Everett in particular faces a challenge that other interpretations don't. But every other attempt to make sense of quantum mechanics smuggles in some classical mechanics. In Everett there's no room for space, or fields, or particles..."
"Maybe the mistake that we've been making is trying to quantize #gravity. We should be trying to find gravity *within* #QuantumMechanics."
"We want to know, can you find #spacetime being curved under the influence of #energy just from #QuantumMechanics?"

"In #QuantumFieldTheory, empty #space is not empty [and] distance is a measure of #entanglement."
"We can imagine an alternate history of #physics in which #GeneralRelativity was not discovered until after all of this."

"It is time to climb out of the box."
Moving into the Q&A:
Join us one week from tonight, 7:30 pm MDT, for our next Community Lecture with Miller Scholar @andrea_wulf on legendary explorer #AlexanderVonHumboldt's restless life packed with #adventure and #discovery, and The Invention of #Nature:

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More from @sfiscience

Jul 26
"Argument-Making in the Wild"

Today's SFI Seminar by Simon DeDeo (@LaboratoryMinds), streaming now. Follow our thread for pull quotes and slides:

First, let's divide human history into three eras, or regimes of #knowledge #production and #consumption:

• #premodern/#archaic
• #modern + #postmodern
• the #egregore (online content sharing)

• The premodern era is defined by caloric restriction.
• The modern era is characterized by a small number of sellers of #information vs. a large number of consumers (see also #HerbertSimon's remarks on the "poverty of #attention")

Read 16 tweets
Jul 6
"The Evolution of Strangers and Foreigners"

🧵 Today's SFI Seminar by @DoctorBugs (@Smithsonian)


cc @templeton_fdn
First, a loop back to his LAST (2020) SFI Seminar on 3D structure of living systems from biofilms to rainforest canopies:

And his #ComplexityPodcast episode on ideas from that talk and this one:
"People often think of societies as cooperative, but some societies are NOT very cooperative. I prefer to put the focus on them as groups."

"Societies are just one aspect of belonging. There are groups *within* societies & that's what psychologists mostly focus on."

Read 15 tweets
Jul 6
🧵 Group project presentations begin today for the 2022 SFI Complex Systems Summer School! We will share bits and pieces over the next two days...

#CSSS #ComplexSystems
First talk this morning by a team including @JenniferKBriggs @gatesdupont @maikemorrison @davidogara_ @simon_rella Ian Harryman & Haoyuan Luo on their contagion model ("Hopefully you'll see this published later" may as well be the official slogan of this summer school)
Our next group considers online #pornography a strangely under-examined domain for quantitative research & wants to bring #digitalhumanities approaches & multilayer network analysis to bear on it. @gulsahakcakir @AnaVybor @thomas_bssnt @prt_thibault @simon_rella

Take their poll:
Read 6 tweets
May 18
"We evolved to be physically active. But most of us avoid physical activity."

The Active Grandparents Hypothesis

Daniel Lieberman, @Harvard

SFI Colloquium, streaming now:
"We evolved from #apes and apes are couch potatoes."

Daniel Lieberman, @Harvard

SFI Colloquium, streaming now:

#evolution #hominin #anthropology #physiology
"Your average hunter-gatherer walks from New York to LA every year."

Daniel Lieberman, @Harvard

SFI Colloquium, streaming now:
Read 24 tweets
May 17
🧵 "Transient dynamics: the key to ecological understanding"

Today's Colloquium by SFI External Professor Alan Hastings (@UCDavis, @theNASciences)

Streaming now on our YouTube channel:

#Ecology #ComplexSystems
@ucdavis @theNASciences "One might say that natural ecological #systems *don't exist anymore*..."

SFI External Prof Alan Hastings @eco_hastings (@UCDavis), criticizes classical approaches to deterministic/equilibrium ecological models, streaming now:

@ucdavis @theNASciences @eco_hastings "The long-term behavior of the #epidemic is not what you want to focus on. Let's focus instead on dynamics at shorter timescales."

SFI External Prof Alan Hastings @eco_hastings
(@UCDavis), criticizes conventional ecological models, streaming now:
Read 9 tweets
Apr 30
🌍 Our 2022 #Science Board Symposium on "The #Emergent #PoliticalEconomy or #ClimateChange" kicks off with opening remarks from President David Krakauer.

Follow this 🧵 as we provide live coverage of this event all day...
"For those of you who think behavior change can prevent #ClimateChange...behavior WILL change when climate changes. Shutdowns from the pandemic resulted in a reduction of #C02 emissions of about 7.5%."
- SFI/@Harvard Prof Dan Schrag opens our speaker series today
"We *used* to talk about #ClimateChange used to be something that would happen to people in Bangladesh fifty years from now."

Re: #ClimateJustice,
"Children born today are going to deal with climate change they had no role in causing."

- SFI/@Harvard Prof Dan Schrag
Read 56 tweets

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