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Properties of the scale factor measure
We show that in expanding regions, the scale factor measure can be reformulated as a local measure: Observations are weighted by integrating their physical density along a geodesic that starts in the
Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary
Observations of extreme plasma lensing in the ‘black widow’ pulsar B1957+20 near the phase in its 9.2-hour orbit at which its emission is eclipsed by its companion’s outflow are reported, suggesting that plasma flowing from the companion acts as a lens.
Coherent cascade conjecture for collapsing solutions in global AdS
We analyze the gravitational dynamics of a classical scalar field coupled to gravity in asymptotically AdS spacetime, which leads to black hole formation on the shortest nonlinear time scale for some
Casting shadows on holographic reconstruction
The existence of shadows motivates further study of the bulk-boundary dictionary in order to identify CFT quantities that encode information about the shadow regions in the bulk.
How to Run Through Walls: Dynamics of Bubble and Soliton Collisions
It has recently been shown in high resolution numerical simulations that relativistic collisions of bubbles in the context of a multivacua potential may lead to the creation of bubbles in a new
Boltzmann babies in the proper time measure
After commenting briefly on the role of the typicality assumption in science, we advocate a phenomenological approach to the cosmological measure problem. Like any other theory, a measure should be
Eternal inflation: the inside story
Motivated by the lessons of black hole complementarity, we develop a causal patch description of eternal inflation. We argue that an observer cannot ascribe a semiclassical geometry to regions
Position space analysis of the AdS (in)stability problem
A bstractWe investigate whether arbitrarily small perturbations in global AdS space are generically unstable and collapse into black holes on the time scale set by gravitational interactions. We
Missing top of the AdS resonance structure
We study a massless scalar field in AdS(d+1) with a nonlinear coupling phi(N) and not limited to spherical symmetry. The free-field-eigenstate spectrum is strongly resonant, and it is commonly
Binary systems as resonance detectors for gravitational waves
Gravitational waves at suitable frequencies can resonantly interact with a binary system, inducing changes to its orbit. A stochastic gravitational-wave background causes the orbital elements of the