322 citations · 598 across the 14 of their papers we have counts for
14 papers
A Bumpy Start to a Smooth Ride: Onset of Inflation amid Backreaction from Inhomogeneities
Jolyon K. Bloomfield, Patrick Fitzpatrick, Kiriakos Hilbert +1
We analyze the onset of inflation for a simple single-field model when the system begins with significant inhomogeneities on length-scales shorter than the initial Hubble radius. W…
Statistics of Peaks in Chi-Squared Fields
Jolyon K. Bloomfield, Stephen H. P. Face, Alan H. Guth +2
Chi-squared random fields arise naturally from the study of fluctuations in field theories with SO(n) symmetry. The extrema of chi-squared fields are of particular physical interes…
Mass of a Patch of an FRW Universe
Sarah R. Geller, Jolyon K. Bloomfield, Alan H. Guth
In 1963, Zel'dovich devised a method to define the mass of a closed Friedmann-Robertson-Walker (FRW) universe, showing that by this definition it is exactly zero. Rounding out this…
Indefinite Integrals of Spherical Bessel Functions
Jolyon K. Bloomfield, Stephen H. P. Face, Zander Moss
Highly oscillatory integrals, such as those involving Bessel functions, are best evaluated analytically as much as possible, as numerical errors can be difficult to control. We inv…
Number Density of Peaks in a Chi-Squared Field
Jolyon K. Bloomfield, Stephen H. P. Face, Alan H. Guth +3
We investigate the statistics of stationary points in the sum of squares of Gaussian random fields, which we call a "chi-squared" field. The behavior of such a field at a point…
Formalism for Primordial Black Hole Formation in Spherical Symmetry
Jolyon Bloomfield, Daniel Bulhosa, Stephen Face
We present a comprehensive formalism for the description of primordial black hole formation in spherical symmetry based on the formalisms of Misner, Sharp, and Hernandez, which can…
The Shape Dependence of Vainshtein Screening
Jolyon K. Bloomfield, Clare Burrage, Anne-Christine Davis
Scalar field theories that possess a Vainshtein mechanism are able to dynamically suppress the associated fifth forces in the presence of massive sources through derivative non-lin…
Cosmic String Loop Microlensing
Jolyon K. Bloomfield, David F. Chernoff
Cosmic superstring loops within the galaxy microlens background point sources lying close to the observer-string line of sight. For suitable alignments, multiple paths coexist and…
Simple numerical implementation of general dark energy models
Jolyon K. Bloomfield, Jonathan A. Pearson
We present a formalism for the numerical implementation of general theories of dark energy, combining the computational simplicity of the equation of state for perturbations approa…
A Simplified Approach to General Scalar-Tensor Theories
Jolyon Bloomfield
The most general covariant action describing gravity coupled to a scalar field with only second order equations of motion, Horndeski's theory (also known as "Generalized Galileons"…
Dark Energy or Modified Gravity? An Effective Field Theory Approach
Jolyon K. Bloomfield, Éanna É. Flanagan, Minjoon Park +1
We take an Effective Field Theory (EFT) approach to unifying existing proposals for the origin of cosmic acceleration and its connection to cosmological observations. Building on e…
A Class of Effective Field Theory Models of Cosmic Acceleration
Jolyon K. Bloomfield, Eanna E. Flanagan
We explore a class of effective field theory models of cosmic acceleration involving a metric and a single scalar field. These models can be obtained by starting with a set of ultr…
Gravitational Interactions in a General Multibrane Model
Jolyon K. Bloomfield, Éanna É. Flanagan
The gravitational interactions of the four-dimensional effective theory describing a general -brane model in five dimensions without radion stabilization are analyzed. Both unco…
A four-dimensional description of five-dimensional N-brane models
Jolyon K. Bloomfield, Éanna É. Flanagan
We propose a new method for obtaining the four-dimensional effective gravitational theory for five-dimensional braneworld models with arbitrary numbers of branes in a low energy re…