266 citations · 723 across the 16 of their papers we have counts for
18 papers
Accurately simulating gain and clock-induced charge production in the EMCCD gain register
Kevin J. Ludwick
An electron-multiplying charge-coupled device (EMCCD) is capable of precise detections in low-signal environments, able to detect a single photon through electron multiplication. I…
Inferred Hubble Parameter from Gravitational Waves in a Perturbative Bianchi I Background
Kevin J. Ludwick, Peter L. Williams
It is straightforward to take the gravitational wave solution to first order in far from a binary source in a Minkowski background and adapt it to the Friedmann-Lemaitre-Robe…
Centroiding Undersampled PSFs with a Lookup Table
Kevin J. Ludwick, Ashley Mazingo
We present a method of centroiding undersampled point spread functions (PSFs) that may be useful, especially when dithering is not an option. If the profile of the expected PSF is…
Simulating reflected light coronagraphy of Earth-like exoplanets with a large IR/O/UV space telescope: impact and calibration of smooth exozodiacal dust
Jens Kammerer, Christopher C. Stark, Kevin J. Ludwick +2
Observing Earth-like exoplanets orbiting within the habitable zone of Sun-like stars and studying their atmospheres in reflected starlight requires contrasts of $\sim1\mathrm{e}{-1…
The Signal-to-Noise Ratio for Photon Counting After Photometric Corrections
Kevin Ludwick
Photon counting is a mode of processing astronomical observations of low-signal targets that have been observed using an electron-multiplying charge-coupled device (EMCCD). In phot…
Deriving the Dark Matter-Dark Energy Interaction Term in the Continuity Equation from the Boltzmann Equation
Kevin J. Ludwick, Holston Sebaugh
Dark energy and dark matter are two of the biggest mysteries of modern cosmology, and our understanding of their fundamental nature is incomplete. Many parameterizations of couplin…
Possible Couplings of Dark Matter
Kevin J. Ludwick
Dark matter interacts gravitationally, but it presumably interacts weakly through other channels, especially with respect to regular luminous matter. We look at different ways in w…
The Viability of Phantom Dark Energy as a Quantum Field in 1st-Order FLRW Space
Kevin J. Ludwick
In the standard cosmological framework of the 0th-order FLRW metric and the use of perfect fluids in the stress-energy tensor, dark energy with an equation-of-state parameter $w <…
The Viability of Phantom Dark Energy: A Brief Review
Kevin J. Ludwick
In this brief review, we examine the theoretical consistency and viability of phantom dark energy. Almost all data sets from cosmological probes are compatible with dark energy of…
Astrophysical Constraints on Inflationary Dark Matter in the Luminogenesis Model
Pham Q. Hung, Kevin J. Ludwick
The assumption of collisionless cold dark matter on its own cannot reconcile several astrophysical discrepancies (cusp-vs-core problem, missing satellite problem, too-big-to-fail p…
Examining the Viability of Phantom Dark Energy
Kevin J. Ludwick
In the standard cosmological framework of the 0th-order FLRW metric and the use of perfect fluids in the stress-energy tensor, dark energy with an equation-of-state parameter $w <…
Constraining Inflationary Dark Matter in the Luminogenesis Model
Pham Q. Hung, Kevin J. Ludwick
Using renormalization-group flow and cosmological constraints on inflation models, we exploit a unique connection between cosmological inflation and the dynamical mass of dark-matt…
Cyclic Cosmology from the Little Rip
Paul H. Frampton, Kevin J. Ludwick
We revisit a cyclic cosmology scenario proposed in 2007 to examine whether its hypotheses can be sustained if the underlying big rip evolution, which was assumed there, is replaced…
Pseudo-rip: Cosmological models intermediate between the cosmological constant and the little rip
Paul H. Frampton, Kevin J. Ludwick, Robert J. Scherrer
If we assume that the cosmic energy density will remain constant or strictly increase in the future, then the possible fates for the universe can be divided into four categories ba…
Models for Little Rip Dark Energy
Paul H. Frampton, Kevin J. Ludwick, Shin'ichi Nojiri +2
We examine in more detail specific models which yield a little rip cosmology, i.e., a universe in which the dark energy density increases without bound but the universe never reach…
The Little Rip
Paul H. Frampton, Kevin J. Ludwick, Robert J. Scherrer
We examine models in which the dark energy density increases with time (so that the equation-of-state parameter w satisfies w < -1), but w approaches -1 asymptotically, such that t…
Seeking Evolution of Dark Energy
Paul H. Frampton, Kevin J. Ludwick
We study how observationally to distinguish between a cosmological constant (CC) and an evolving dark energy with equation of state . We focus on the value of redshift Z* at…
Number and Entropy of Halo Black Holes
Paul H. Frampton, Kevin Ludwick
Based on constraints from microlensing and disk stability, both with and without limitations from wide binary surveys, we estimate the total number and entropy of intermediate mass…