He has appeared on the History Channel's The Universe, Science Channel's Through the Wormhole with Morgan Freeman, Closer to Truth (broadcast on PBS),[12] and Comedy Central's The Colbert Report. Carroll is the author of Spacetime And Geometry, a graduate-level textbook in general relativity, and has also recorded lectures for The Great Courses on cosmology, Time in physics and the Higgs boson.[13] He is also the author of four popular books: From Eternity to Here about the arrow of time, The Particle at the End of the Universe about the Higgs boson, The Big Picture: On the Origins of Life, Meaning, and the Universe Itself about ontology, and Something Deeply Hidden about the foundations of quantum mechanics. He began a podcast in 2018 called Mindscape, in which he interviews other experts and intellectuals coming from a variety of disciplines, including "[s]cience, society, philosophy, culture, arts and ideas" in general.[14] He has also published a YouTube video series entitled "The Biggest Ideas in the Universe" which provides physics instruction at a popular-science level but with equations and a mathematical basis, rather than mere analogy. The series has become the basis of a new book series with the installment, The Biggest Ideas in the Universe: Space, Time, and Motion, published in September 2022.[15]
He is also a very prolific public speaker, hosting the podcast series Mindscape,[23] which he describes as "Sean Carroll hosts conversations with the world's most interesting thinkers", and The Biggest Ideas in the Universe.[24] He also delivers public speeches as well as getting engaged in public debates in wide variety of topics.
Carroll has worked on a number of areas of theoretical cosmology, field theory and gravitation theory. His research papers include models of, and experimental constraints on, violations of Lorentz invariance; the appearance of closed timelike curves in general relativity; varieties of topological defects in field theory; and cosmological dynamics of extra spacetime dimensions. He has written extensively on models of dark energy and its interactions with ordinary matter and dark matter, as well as modifications of general relativity in cosmology. He has also worked on the foundations of quantum mechanics, especially the many-worlds interpretation, including a derivation of the Born rule for probabilities.
Carroll has also worked on the arrow of time problem. He and Jennifer Chen posit that the Big Bang is not a unique occurrence as a result of all of the matter and energy in the universe originating in a singularity at the beginning of time, but rather one of many cosmic inflation events resulting from quantum fluctuations of vacuum energy in a cold de Sitter space. They claim that the universe is infinitely old but never reaches thermodynamic equilibrium as entropy increases continuously without limit due to the decreasing matter and energy density attributable to recurrent cosmic inflation. They assert that the universe is "statistically time-symmetric", insofar as it contains equal progressions of time "both forward and backward".[33][34][35] Some of his work has been on violations of fundamental symmetries, the physics of dark energy, modifications of general relativity and the arrow of time. Recently he started focusing on issues at the foundations of cosmology, statistical mechanics, quantum mechanics and complexity.
In 2017, Carroll presented an argument for rejecting certain cosmological models, including those with Boltzmann brains, on the basis that they are cognitively unstable: they cannot simultaneously be true and justifiably believed.[36] The article was solicited as a contribution to a larger work on Current Controversies in Philosophy of Science.
Philosophical and religious views
Carroll, while raised as an Episcopalian,[37] is an atheist, or as he calls it, a "poetic naturalist". He turned down an invitation to speak at a conference sponsored by the John Templeton Foundation, because he did not want to appear to be supporting a reconciliation between science and religion.[38]
In 2004, he and Shadi Bartsch taught an undergraduate course at the University of Chicago on the history of atheism. In 2012, he organized the workshop "Moving Naturalism Forward", which brought together scientists and philosophers to discuss issues associated with a naturalistic worldview. His article "Does the Universe Need God?" in The Blackwell Companion to Science and Christianity develops the claim that science no longer needs to posit a divine being to explain the existence of the universe. The article generated significant attention when it was discussed on The Huffington Post.[39] Carroll received an "Emperor Has No Clothes" award at the Freedom From Religion Foundation Annual National Convention in October 2014.[40]
His 2016 book The Big Picture: On the Origins of Life, Meaning and the Universe Itself develops the philosophy of poetic naturalism, the term he is credited with coining. The book talks about wide range of topics such as submicroscopic components of the universe, whether human existence can have meaning without God—and everything between the two.[8]
Carroll's speeches on the philosophy of religion also generate interest as his speeches are often responded to and talked about by philosophers and apologists.[6][41][42][43][44][45][46] Carroll believes that thinking like a scientist leads one to the conclusion that God does not exist.[10] Carroll thinks that over four centuries of scientific progress have convinced most professional philosophers and scientists of the validity of naturalism.[47] Carroll also asserts that the term methodological naturalism is an inaccurate characterisation of science, that science is not characterised by methodological naturalism but by methodological empiricism.[48]
Carroll is a vocal atheist who has debated with Christian apologists such as Dinesh D'Souza and William Lane Craig.[8] He occasionally takes part in formal debates and discussions about scientific, religious and philosophical topics with a variety of people. Politically, Carroll has expressed his opposition to former president Donald Trump. He wrote ahead of the 2016 United States presidential election that "[Trump] has continually vilified immigrants and foreigners generally, promoting an us-against-them mentality between people of different races and ethnicities" and that he posed a threat to liberal democratic values.[49]
Also in 2014, Carroll partook in a debate held by Intelligence Squared, the title of the debate was "Death is Not Final". Carroll teamed up with Steven Novella, a neurologist by profession known for his skepticism, and the two argued against the motion. Their adversaries were Eben Alexander, neurosurgeon and an author, and Raymond Moody, a philosopher, author, psychologist and physician.
In 2017, Carroll took part in a discussion with B. Alan Wallace, a Buddhist scholar and monk ordained by the Dalai Lama. It was organized by an institution sponsored by the John Templeton Foundation.[56] In this public dialogue, they discussed the nature of reality from spiritual and scientific viewpoints.[57]
In 2018, Carroll and Roger Penrose held a symposium on the subject of The Big Bang and Creation Myths.[58] The two also engaged in a dialogue in Sean Carroll's MindScape Podcast on its 28th episode.[59][third-party source needed]
Selected publications
Carroll, Sean (2003). Spacetime and Geometry: An Introduction to General Relativity. Addison Wesley. ISBN0-8053-8732-3. Reprinted 2019.
^Carroll, Sean. "Sean Carroll – Preposterous Universe". www.preposterousuniverse.com. Retrieved March 28, 2023. My official title is Homewood Professor of Natural Philosophy at Johns Hopkins, and I am also Fractal Faculty at the Santa Fe Institute. I live in Baltimore with my wife, writer Jennifer Ouellette, and two cats, Ariel and Caliban.
^"A Theological Critique of the Fine-Tuning Argument". Knowledge, Belief and God: New Insights in Religious Epistemology. Oxford University Press. 2018. p. 133. ISBN978-0-19-879870-5.
Video of Sean Carroll's panel discussion, "Quantum to Cosmos", answering the biggest questions in physics today, Part 1 at Perimeter Institute's Quantum to Comos (Q2C) festival