Sean Carroll
About
Host of Mindscape; physicist, now Homewood Professor at Johns Hopkins; author of From Eternity to Here
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Claims by Sean Carroll (20 of 4,252)
Naturalism Asserts Only One Natural World
Naturalism is the positive claim that there is only one world, the natural world that obeys rules and which we learn about through science, defined in opposition to belief in extra spirits or a realm of divinity; it is close to atheism but stated positively as a claim about what does exist rather than what doesn't.
Counterintuitiveness Is Expected In Fundamental Physics
Because our intuitions developed over evolutionary time for ordinary scales, it would be surprising if our best view of the fundamental nature of reality were not highly counterintuitive; therefore, when faced with strangeness in relativity, cosmology, and quantum mechanics, the best methodological response is to take the equations seriously rather than trust intuition, which leads to the block universe and many-worlds.
Poetic Side Allows Many Descriptions Beyond Facts
The 'poetic' element of poetic naturalism holds that there are many legitimate ways of talking about the one natural world—from particle physics up through biology, sociology, and psychology, and further into aesthetics, judgments, and values—where at the higher poetic levels the descriptions are not fixed by the facts of the universe themselves.
Downward Causation Is Unintelligible
The idea of downward causation—that the macroscopic shape or purpose of a thing feeds back and changes the behavior at the microscopic level in a way not derivable from the microscopic level alone—is wrong; the snowflake example fails because if you fully knew what every water molecule was doing, that is all you would need to know.
Philosophical Zombies Are Inconceivable
A philosophical zombie—something that acts exactly like a conscious person but has no inner sensations—is not even conceivable, because if you asked a zombie what it is feeling it would report feeling something (otherwise it would act differently), which means either the zombie is lying about its inner states or it really has them.
Many-Worlds Is Conceptually Most Parsimonious
Many-worlds is the simplest, most parsimonious interpretation of quantum mechanics because it simply takes the Schrödinger equation literally: when a superposed system is measured, the equation already predicts both outcomes plus an observer who saw each, so rather than magically deleting the unobserved branch (as the Copenhagen interpretation does), one should admit both branches exist; it is messy in number of universes but maximally simple in concepts, and interpretations should be judged on concepts not universe-count.
Panpsychism Is Implausible And Unmotivated
Panpsychism—the idea that every particle has mental as well as physical properties, only faintly conscious individually but combining into full consciousness in a person—is a surprisingly popular but implausible position; the universe would not look different if it were true, since an electron buzzing with subjectivity would not change how a chair behaves.
Everett Was Expelled For Many-Worlds
In 1957 graduate student Hugh Everett proposed that rather than magically deleting the unobserved measurement outcome one should accept that both outcomes (and two copies of the observer) exist, birthing the many-worlds interpretation; he was effectively driven out of physics for it because the field would no longer engage him.
Block Universe Treats Time As Equally Real
The block universe view holds that past, present, and future are all equally real points in a four-dimensional structure—like pages of a novel that all exist even though we experience one at a time; it follows from taking the equations of fundamental physics seriously, since they do not distinguish yesterday, today, and tomorrow, treating them as just different numbers on a line, making reality a giant noun rather than a verb.
Entropy Increase Underlies The Arrow Of Time
The physical reason the past seems different from the future is entropy: entropy (the disorder of a system) tends to increase in closed systems, enshrined in the second law of thermodynamics, and this single feature underlies every difference we notice between past and future—aging, why we remember the past but not the future, and our sense that the future is open—ultimately because entropy was lower in the past.
Mixing Levels Of Description Causes Apparent Conflict
The tension Harris points to comes from illegitimately mixing two levels of description: one may talk about humans as agents talking to other people and making choices, or about brains being influenced by subconscious processes and histories, but not both at the same time; the error is translating person-level words like 'you' and 'yourself' down into the brain-level vocabulary, just as recognizing a chair is made of atoms does not abolish the chair.
Doing The One Thing You Learned Versus What Matters
A common career trap is that you go from being able to do zero things as a graduate student to being able to do one thing by the end, and there is a strong temptation to keep doing that one hard-won thing for fifty years even though it may not be the most interesting or important thing to do; thinking bigger and switching focus to what is genuinely most important is difficult but worthwhile.
You Cannot Logically Derive Ought From Is
Following Hume, you cannot derive an 'ought' from an 'is': by the rules of deductive logic, garbage in/garbage out, values in/values out, facts in/facts out—you cannot derive normative conclusions about what is morally right without including in your premises an assumption or axiom that relates to values; this is a straightforward computational/logical claim that everyone should accept, independent of the separate question of moral realism.
Morality Needs An Axiom Not Found In Science
Both morality and science require axioms to get off the ground, but the axioms needed for morality are not a subset of those needed for science: science's possible-worlds method lets us go look and discover what is, whereas the principle that we should avoid maximal suffering for conscious creatures cannot be learned that way—it is an extra value axiom one must choose, and the double standard is asking morality to be self-justifying in a way science never is.
Quantum Mechanics Is Physics Not Magic
Quantum mechanics is physics, not magic: the historical Copenhagen interpretation gave the act of observation special status and led even professional physicists to think consciousness plays a role in wave function collapse, but today almost nobody holds this because we have equations and mechanisms (decoherence) that make measurement happen regardless of consciousness, so claims that consciousness brings reality into existence are nonsense.
Foundational Physics Neglected Quantum Interpretation
Twentieth-century physics achieved the astonishing feat of figuring out how to use quantum mechanics as a black-box cookbook while tragically failing to try to understand what it says about reality, because a bad incentive structure systematically prevented those who wanted to work on the measurement problem and interpretation from becoming professional physicists, treating such work as disreputable rather than the highest priority.
Superdeterminism Requires Adding Hidden Structure
Superdeterminism—the idea that quantum probabilities reflect ignorance because the outcome of each measurement was fixed long ago in the universe's initial conditions—does not make quantum mechanics simpler; many-worlds already contains everything implied by a quantum state evolving via the Schrödinger equation, so superdeterminism and every other interpretation must add new structure to get rid of the other worlds, which is not obviously worth it.
QM Interpretation Polls Vary By Conference
Polls of physicists on which quantum interpretation they favor vary wildly depending on which conference the poll is taken at—cosmologists tend to favor many-worlds, atomic and laboratory physicists tend toward operational or epistemic interpretations (treating the quantum state as knowledge not reality), and philosophers favor hidden-variable interpretations—precisely because the field does not seriously think about it and considers it slightly disreputable.
String Theory Extends Quantum Field Theory
Quantum field theory is right within its domain of validity (like saying 'this is a chair'—deeper truths may emerge but won't refute it), while string theory attempts to go beyond it by positing that an electron is a tiny loop of string rather than a point; remarkably, making this consistent quantum mechanically predicts the existence of gravity, so string theory is the leading theory of quantum gravity, though we have no idea yet whether it actually describes nature better than other extensions.
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