154 citations · 613 across the 19 of their papers we have counts for
19 papers
Multiverse rate equation including bubble collisions
Michael P. Salem
The volume fractions of vacua in an eternally inflating multiverse are described by a coarse-grain rate equation, which accounts for volume expansion and vacuum transitions via bub…
Gravity waves from cosmic bubble collisions
Michael P. Salem, Prashant Saraswat, Edgar Shaghoulian
Our local Hubble volume might be contained within a bubble that nucleated in a false vacuum with only two large spatial dimensions. We study bubble collisions in this scenario and…
The CMB and the measure of the multiverse
Michael P. Salem
In the context of eternal inflation, cosmological predictions depend on the choice of measure to regulate the diverging spacetime volume. The spectrum of inflationary perturbations…
Bubble collisions and measures of the multiverse
Michael P. Salem
To compute the spectrum of bubble collisions seen by an observer in an eternally-inflating multiverse, one must choose a measure over the diverging spacetime volume, including choo…
Phenomenology of the CAH+ measure
Michael P. Salem, Alexander Vilenkin
The CAH+ measure regulates the infinite spacetime volume of the multiverse by constructing a surface of constant comoving apparent horizon (CAH) and then removing the future lightc…
A signature of anisotropic bubble collisions
Michael P. Salem
Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension---the modulus of which tunnels out…