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New Models for a Triaxial Milky Way Spheroid and Effect on the Microlensing Optical Depth to the Large Magellanic Cloud
Christopher Savage, Heidi Jo Newberg, Katherine Freese +1
We obtain models for a triaxial Milky Way spheroid based on data by Newberg and Yanny. The best fits to the data occur for a spheroid center that is shifted by 3kpc from the Galact…
Devaluation: a dynamical mechanism for a naturally small cosmological constant
Katherine Freese, James T. Liu, Douglas Spolyar
We propose a natural solution to the cosmological constant problem consistent with the standard cosmology and successful over a broad range of energies. This solution is based on t…
Holes in the walls: primordial black holes as a solution to the cosmological domain wall problem
Dejan Stojkovic, Katherine Freese, Glenn D. Starkman
We propose a scenario in which the cosmological domain wall and monopole problems are solved without any fine tuning of the initial conditions or parameters in the Lagrangian of an…
Double Field Inflation
Fred C. Adams, Katherine Freese
We present an inflationary universe model which utilizes two coupled real scalar fields. The inflation field experiences a first order phase transition and its potential domina…
Inflating with the QCD Axion
Katherine Freese, James T. Liu, Douglas Spolyar
We show that the QCD axion can drive inflation via a series of tunneling events. For axion models with a softly broken symmetry, the axion potential has a series of local…
Cardassian Expansion: Dark Energy Density from Modified Friedmann Equations
Katherine Freese
The Cardassian universe is a proposed modification to the Friedmann equation in which the universe is flat, matter dominated, and accelerating. In the ordinary Friedmann equation,…