109 citations · 163 across the 3 of their papers we have counts for
9 papers
Gravity as an ensemble and the moment problem
Oliver Janssen, Mehrdad Mirbabayi, Peter Zograf
If a bulk gravitational path integral can be identified with an average of partition functions over an ensemble of boundary quantum theories, then a corresponding moment problem ca…
Low-temperature entropy in JT gravity
Oliver Janssen, Mehrdad Mirbabayi
For ensembles of Hamiltonians that fall under the Dyson classification of random matrices with , the low-temperature mean entropy can be shown to vanish as $\langle…
Decoherence: A Numerical Study
Chris Nagele, Oliver Janssen, Matthew Kleban
We study quantum decoherence numerically in a system consisting of a relativistic quantum field theory coupled to a measuring device that is itself coupled to an environment. The m…
The no-boundary proposal in biaxial Bianchi IX minisuperspace
Oliver Janssen, Jonathan J. Halliwell, Thomas Hertog
We implement the no-boundary proposal for the wave function of the universe in an exactly solvable Bianchi IX minisuperspace model with two scale factors. We extend our earlier wor…
The Axidental Universe
Thomas C. Bachlechner, Kate Eckerle, Oliver Janssen +1
Theories with several hundred axion fields have enormous numbers of distinct meta-stable minima. A small fraction of these local minima have vacuum energy compatible with current m…
Axion Landscape Cosmology
Thomas C. Bachlechner, Kate Eckerle, Oliver Janssen +1
We study the cosmology of complex multi-axion theories. With O(100) fields and GUT scale energies these theories contain a vast number of vacua, inflationary trajectories and a nat…