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Many Worlds, the Born Rule, and Self-Locating Uncertainty
Sean M. Carroll, Charles T. Sebens
We provide a derivation of the Born Rule in the context of the Everett (Many-Worlds) approach to quantum mechanics. Our argument is based on the idea of self-locating uncertainty:…
Attractor Solutions in Scalar-Field Cosmology
Grant N. Remmen, Sean M. Carroll
Models of cosmological scalar fields often feature "attractor solutions" to which the system evolves for a wide range of initial conditions. There is some tension between this well…
What if Time Really Exists?
Sean M. Carroll
Despite the obvious utility of the concept, it has often been argued that time does not exist. I take the opposite perspective: let's imagine that time does exist, and the universe…
Does Inflation Provide Natural Initial Conditions for the Universe?
Sean M. Carroll, Jennifer Chen
If our universe underwent inflation, its entropy during the inflationary phase was substantially lower than it is today. Because a low-entropy state is less likely to be chosen ran…
Lecture Notes on General Relativity
Sean M. Carroll
These notes represent approximately one semester's worth of lectures on introductory general relativity for beginning graduate students in physics. Topics include manifolds, Rieman…
Bosonic physical states in N=1 supergravity?
S. M. Carroll, D. Z. Freedman, M. E. Ortiz +1
It is argued that states in supergravity that solve all of the constraint equations cannot be bosonic in the sense of being independent of the fermionic degrees of freedom. (…