276 citations · 2k across the 57 of their papers we have counts for
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The Lorentzian Geometry of Tunneling in Global de Sitter at Late Time
Thibaut Coudarchet, Ben Freivogel, Bjoern Hassfeld +1
It is widely believed that Coleman--De Luccia (CDL) instantons characterize tunneling transitions in a de Sitter multiverse. Their most naive interpretation uses analytic continuat…
JT gravity on the worldline
Ben Freivogel, Alessandro Fumagalli, Diego M. Hofman
Motivated by the problem of understanding the experience of an observer in dynamical quantum gravity, we study the effects of coupling a one-dimensional quantum mechanical system l…
Quantum Fluctuations of the Black Hole Horizon
Ben Freivogel, Antony Speranza, Erik Verlinde
Classical black holes have sharply defined event horizons, but quantum mechanically the horizon acquires a quantum uncertainty, called the `quantum width' by Marolf. We propose a d…
Large Quantum Gravity Fluctuations of BTZ Black Holes
Ben Freivogel, Upamanyu Moitra
We study the quantum fluctuations of the black hole horizon in three-dimensional Anti-de Sitter (AdS) spacetime. We define a precise protocol to calculate the horizon fluctuations…
How traversable is a traversable wormhole?
Ben Freivogel, Alessandro Fumagalli, Marija Tomašević
To answer the above question, we study low-frequency scattering in the four-dimensional traversable wormhole of Maldacena, Milekhin, and Popov. The resulting transmission probabili…
On the positivity of light-ray operators
Ben Freivogel, Hidde Stoffels
We consider light-ray operators , where is a null coordinate and a positive integer, in QFT in Minkowski spacetime…