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One Gravitational Potential or Two? Forecasts and Tests
Edmund Bertschinger
The metric of a perturbed Robertson-Walker spacetime is characterized by three functions: a scale-factor giving the expansion history and two potentials which generalize the single…
Scale-Dependent Growth from a Transition in Dark Energy Dynamics
Mustafa A. Amin, Phillip Zukin, Edmund Bertschinger
We investigate the observational consequences of the quintessence field rolling to and oscillating near a minimum in its potential, "if" it happens close to the present epoch (z<0.…
Velocity Structure of Self-Similar Spherically Collapsed Halos
Phillip Zukin, Edmund Bertschinger
Using a generalized self-similar secondary infall model, which accounts for tidal torques acting on the halo, we analyze the velocity profiles of halos in order to gain intuition f…
Self-Similar Spherical Collapse with Tidal Torque
Phillip Zukin, Edmund Bertschinger
N-body simulations have revealed a wealth of information about dark matter halos however their results are largely empirical. Using analytic means, we attempt to shed light on simu…
Hierarchy in the Phase Space and Dark Matter Astronomy
Niayesh Afshordi, Roya Mohayaee, Edmund Bertschinger
We develop a theoretical framework for describing the hierarchical structure of the phase space of cold dark matter haloes, due to gravitationally bound substructures. Because it i…