Cosmic Superstrings: Dynamics and Cusps (2009)
Whilst standard field theoretic Cosmic Strings cannot end, Cosmic Superstrings can form three string junctions, at which each string ends. This opens up a new class of possible boundary conditions...
Unstable Anisotropic Loop Quantum Cosmology (2009)
Nelson, William, Sakellariadou, Mairi
We study stability conditions of the full Hamiltonian constraint equation describing the quantum dynamics of the diagonal Bianchi I model in the context of LQC. Our analysis has shown robust evidence...
Lattice Refining Loop Quantum Cosmology from an Isotropic Embedding of Anisotropic Cosmology (2009)
Nelson, William, Sakellariadou, Mairi
We demonstrate that it is possible to produce different isotropic embeddings of anisotropic Loop Quantum Cosmology, resulting to "lattice refinement" in the isotropic system. To introduce the general...
Natural inflation mechanism in asymptotic noncommutative geometry (2009)
Nelson, William, Sakellariadou, Mairi
The possibility of having an inflationary epoch within a noncommutative geometry approach to unifying gravity and the standard model is demonstrated. This inflationary phase occurs without the need...
Integrating sequence with FPC fingerprint maps (2009)
Nelson, William, Soderlund, Carol
Recent advances in both clone fingerprinting and draft sequencing technology have made it increasingly common for species to have a bacterial artificial clone (BAC) fingerprint map, BAC end sequences...
Nelson, William, Luo, Meizhong, Ma, Jianxin, Estep, Matt, Estill, James, He, Ruifeng, ...
Abstract Background Many plant genomes are resistant to whole-genome assembly due to an abundance of repetitive sequence, leading to the development of gene-rich sequencing techniques. Two such...
Cosmology and the Noncommutative approach to the Standard Model (2008)
Nelson, William, Sakellariadou, Mairi
We study cosmological consequences of the noncommutative approach to the standard model. Neglecting the nonminimal coupling of the Higgs field to the curvature, noncommutative corrections to...
Space-time dimensionality from brane collisions (2008)
Nelson, William, Sakellariadou, Mairi
Collisions and subsequent decays of higher dimensional branes leave behind three-dimensional branes and anti-branes, one of which could play the role of our universe. This process also leads to the...
Tachyonic decay of unstable Dirichlet branes (2008)
Nelson, William, Sakellariadou, Mairi
We consider an unstable bound system of two supersymmetric Dirichlet branes of different dimensionality ($p,p'$ with $p'
Cusps on cosmic superstrings with junctions (2008)
Davis, Anne-Christine, Nelson, William, Rajamanoharan, Senthooran, Sakellariadou, Mairi
The existence of cusps on non-periodic strings ending on D-branes is demonstrated and the conditions, for which such cusps are generic, are derived. The dynamics of F-, D-string and FD-string...
Unique factor ordering in the continuum limit of LQC (2008)
Nelson, William, Sakellariadou, Mairi
We show that the factor ordering ambiguities associated with the loop quantisation of the gravitational part of the cosmological Hamiltonian constraint, disappear at the level of Wheeler-DeWitt...
Small Genome Annotation and Data Management at TIGR (2008)
Michelle Gwinn, William Nelson, Robert Dodson, Steven Salzberg, Owen White
TIGR has developed, and continues to refine, a comprehensive, efficient system for small genome annotation. The Glimmer gene finding software identifies open reading frames most likely to code for...
Nelson, William, Sakellariadou, Mairi
To avoid instabilities in the continuum semi-classical limit of loop quantum cosmology models, refinement of the underlying lattice is necessary. The lattice refinement leads to new dynamical...
Environmental Genome Shotgun Sequencing of the Sargasso Sea (2008)
Sargasso Sea, J. Craig Venter, Et Al, J. Craig Venter, Karin Remington, John F. Heidelberg, ...
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Kant's Formula of Humanity (2008)
This paper is concerned with the normative content of Kant's formula of humanity (FH). More specifically, does FH, as some seem to think, imply the specific and rigid prescriptions in 'standard'...
United States Department of Agriculture (2007)
United States, Forest Service Forest, Jerrold E. Winandy, Patricia K. Lebow, William Nelson
This report describes the development of a test method and predictive model to estimate the residual bending strength of fire-retardant-treated plywood roof sheathing from measurement of...
On the possibility of Dark Energy from corrections to the Wheeler-De Witt equation (2007)
Nelson, William, Sakellariadou, Mairi
We present a method for approximating the effective consequence of generic quantum gravity corrections to the Wheeler-DeWitt equation. We show that in many cases these corrections can produce...
Lattice Refining LQC and the Matter Hamiltonian (2007)
Nelson, William, Sakellariadou, Mairi
In the context of loop quantum cosmology, we parametrise the lattice refinement by a parameter, $A$, and the matter Hamiltonian by a parameter, $\delta$. We then solve the Hamiltonian constraint for...
Lattice Refining Loop Quantum Cosmology and Inflation (2007)
Nelson, William, Sakellariadou, Mairi
We study the importance of lattice refinement in achieving a successful inflationary era. We solve, in the continuum limit, the second order difference equation governing the quantum evolution in...
On the Onset of Inflation in Loop Quantum Cosmology (2007)
Germani, Cristiano, Nelson, William, Sakellariadou, Mairi
Using a Liouville measure, similar to the one proposed recently by Gibbons and Turok, we investigate the probability that single-field inflation with a polynomial potential can last long enough to...
SyMAP: A system for discovering and viewing syntenic regions of FPC maps (2006)
Soderlund, Carol, Nelson, William, Shoemaker, Austin, Paterson, Andrew
Previous approaches to comparing gene and chromosome organization between two genomes have been based on genetic maps or genomic sequences. We have developed a system to align an FPC-based physical...
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Locating Sequence on FPC Maps and Selecting a Minimal Tiling Path (2003)
Engler, Friedrich W., Hatfield, James, Nelson, William, Soderlund, Carol A.
This study discusses three software tools, the first two aid in integrating sequence with an FPC physical map and the third automatically selects a minimal tiling path given genomic draft sequence...
Locating Sequence on FPC Maps and Selecting a Minimal Tiling Path (2003)
Engler, Friedrich W., Hatfield, James, Nelson, William, Soderlund, Carol A.
This study discusses three software tools, the first two aid in integrating sequence with an FPC physical map and the third automatically selects a minimal tiling path given genomic draft sequence...
Disagreement as Self-Deception About Meta-Rationality (2002)
Tyler Cowen, Robin Hanson, Maureen Kelley, Tom Morrow, William Nelson, David Schmidtz, ...
comments and discussion. Honest truth-seeking agents, Bayesian and otherwise, should not agree to disagree. This result is robust to many perturbations. Such agents are "meta-rational...
Is There a Tardive Dysmentia? (1983)
Wilson, Ian C., Garbutt, James C., Lanier, Clayton F., Moylan, Joseph, Nelson, William, Prange, Arthur J.
A change in the phenomenology of schizophrenia has been observed over the past several decades; affective disturbances and phasic courses have become more evident. Although there is no obvious single...
Integrating sequence with FPC fingerprint maps
Nelson, William, Soderlund, Carol
Recent advances in both clone fingerprinting and draft sequencing technology have made it increasingly common for species to have a bacterial artificial clone (BAC) fingerprint map, BAC end sequences...