3 papers
gr-qc2026
Toward a Phenomenologically Acceptable Quantum Cyclic Universe
Sean M. Carroll, Nadiia Diachenko, Saakshi Dulani
We put forward a quantum model of cosmology that is exactly periodic but avoids the Boltzmann Brain problem. If the universe is described by a quantum state evolving unitarily in a…
gr-qc2025
What Hawking Radiation Looks Like as You Fall into a Black Hole
Christopher J. Shallue, Sean M. Carroll
We study the measurements of a freely falling Unruh-DeWitt particle detector near the horizon of a semiclassical Schwarzschild black hole. Our results show that the detector's resp…
hep-th2024
Holographic phenomenology via overlapping degrees of freedom
Oliver Friedrich, ChunJun Cao, Sean M. Carroll +2
The holographic principle suggests that regions of space contain fewer physical degrees of freedom than would be implied by conventional quantum field theory. Meanwhile, in Hilbert…