Profile

Sean Carroll
Works at Caltech
Attended Harvard University
Lives in Los Angeles
66,387 followers|2,814,740 views
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In his circles
405 people
Have him in circles
66,387 people
Work
Occupation
Scientist
Employment
• Caltech
Scientist, present
Places
Currently
Los Angeles
Contact Information
Work
 Email carroll@cosmicvariance.comseancarroll@gmail.com
Story
Tagline
Physicist at Caltech. Master of time and space.
Introduction
I think about things that are smaller than atoms and/or bigger than galaxies.  Everything in between scares me.

Links on right will lead you to awesome things to read and think about.

Disclaimer: my opinions are the ones everyone should have.
Bragging rights
Married to +Jennifer Ouellette.
Education
• Harvard University
Astronomy (PhD), 1988 - 1993
• Villanova University
Astronomy (BA), 1984 - 1988
• Pennsbury High School
1980 - 1984
Basic Information
Gender
Male
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Sean Carroll

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The classical limit of quantum mechanics should yield probability distributions, not individual trajectories.
http://blog.jessriedel.com/2015/03/24/how-to-think-about-quantum-mechanics-part-4-quantum-indeterminism-as-an-anomaly/﻿
[latexpage] One of the great crimes against humanity occurs each year in introductory quantum mechanics courses when students are introduced to an $\hbar \to 0$ limit, sometimes decorated with word...
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The classical "trajectory" is simply the mean of the distribution. No big deal.﻿
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Claim: all modern technology is based on underlying physics (elementary particles/forces) that we understood prior to 1950. Counterexamples?﻿
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The electron antineutrino was hypothesized 1930 but detected only 1956. If actual detection of a particle is the threshold for "understood", anything involving beta decay might count. ﻿
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Should we think of quantum mechanics as a theory of many interacting classical worlds? Guest post from Chip Sebens.
http://www.preposterousuniverse.com/blog/2014/12/16/guest-post-chip-sebens-on-the-many-interacting-worlds-approach-to-quantum-mechanics/﻿
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Even if time is an emergent phenomenon, it's still okay to wish people Happy New Year.
http://www.smithsonianmag.com/science-nature/what-does-happy-new-year-even-really-mean-180953633/﻿
Physicists engage in a strange debate about whether time really passes
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Shot dead for drawing satirical cartoons. The attack on Charlie Hebdo in Paris is stomach-churning.
http://www.nytimes.com/2015/01/08/world/europe/charlie-hebdo-paris-shooting.html?partner=rss&emc=rss&_r=1&pagewanted=all﻿
A number of prominent editors and cartoonists at the satirical newspaper, which was firebombed in 2011, and two police officers were said to be among those killed.
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The ideal strategy for a simple form of poker -- what it is, and what it implies.
http://www.preposterousuniverse.com/blog/2015/01/09/a-simple-form-of-poker-essentially-solved/﻿
You know it's a good day when there are refereed articles in Science about poker. (Enthusiasm slightly dampened by the article being behind a paywall, but some details here.) Poker, of course, is a game of incomplete information. You don't know your opponent's cards, they don't know yours.
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In his circles
405 people
Have him in circles
66,387 people

Sean Carroll

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Angelina Jolie Pitt on her cancer-prevention surgeries: "this is a part of life."
http://www.3quarksdaily.com/3quarksdaily/2015/03/diary-of-a-surgery.html﻿
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We live in an age of beating the quantum possibility theory﻿
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Everyone needs a metaethical stance. Apparently mine is labeled "Humean constructivism." I can live with that.
http://philosophicaldisquisitions.blogspot.com/2010/05/what-is-contructivism-in-metaethics.html﻿
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Great video animation exploring the boundary between "living" and "non-living." h/t @JenLucPiquant
http://laughingsquid.com/an-animation-questioning-death-what-it-means-to-be-alive-and-whether-there-is-a-difference-between-the-two/﻿
In a recent video, Kurzgesagt questions death, what it means to be alive, and whether there really is a difference between the two. The video starts as a scientific look at what separates a living ...
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Science has proven reincarnation (google that) and the eternal soul.﻿
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There is no "finitude of life". This is just another false teaching by an atheist who ignores all data supporting GOD & God-incarnate.﻿
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Stories from atheists of "coming out" to their parents. Most ... do not go well.
http://www.reddit.com/r/atheism/wiki/comingout﻿
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What century is this again?﻿
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If you don't really understand dark matter, 11-year-old Lucas Belz-Koeling explains it quite well. (Even if you do.)
http://www.preposterousuniverse.com/blog/2015/01/12/dark-matter-explained/﻿
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Best agricultural checkpoint I've ever experienced. I really felt that my agriculture was thoroughly vetted.
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