1.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The Ohio State UniversityUS1.6k papers
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40 papers · 1 filter
Dark energy without dark energy
David L. Wiltshire
An overview is presented of a recently proposed "radically conservative" solution to the problem of dark energy in cosmology. The proposal yields a model universe which appears to…
Gravitational energy and cosmic acceleration
David L. Wiltshire
Cosmic acceleration is explained quantitatively, as an apparent effect due to gravitational energy differences that arise in the decoupling of bound systems from the global expansi…
Constraints on Gauss-Bonnet Cosmologies
Ishwaree P. Neupane
The modified Gauss-Bonnet gravity can be motivated by a number of physical reasons, including: the uniqueness of a gravitational Lagrangian in four and higher dimensions and the le…
Inflation and Quintessence: Theoretical Approach of Cosmological Reconstruction
Ishwaree P. Neupane, Christoph Scherer
In the first part of this paper, we outline the construction of an inflationary cosmology in the framework where inflation is described by a universally evolving scalar field, with…
On the Mutual Information Distribution of OFDM-Based Spatial Multiplexing: Exact Variance and Outage Approximation
Matthew R. McKay, Peter J. Smith, Himal A. Suraweera +1
This paper considers the distribution of the mutual information of frequency-selective spatially-uncorrelated Rayleigh fading MIMO channels. Results are presented for OFDM-based sp…
Search for Ultra High-Energy Neutrinos with AMANDA-II
The IceCube Collaboration, M. Ackermann
A search for diffuse neutrinos with energies in excess of 10^5 GeV is conducted with AMANDA-II data recorded between 2000 and 2002. Above 10^7 GeV, the Earth is essentially opaque…
Dynamical surface gravity
Alex B. Nielsen, Jong Hyuk Yoon
We discuss how the surface gravity can be classically defined for dynamical black holes. In particular we focus on defining the surface gravity for locally defined horizons and com…
Exact solution to the averaging problem in cosmology
David L. Wiltshire
The exact solution of a two-scale Buchert average of the Einstein equations is derived for an inhomogeneous universe which represents a close approximation to the observed universe…
Area limit laws for symmetry classes of staircase polygons
Christoph Richard, Uwe Schwerdtfeger, Bhalchandra Thatte
We derive area limit laws for the various symmetry classes of staircase polygons on the square lattice, in a uniform ensemble where, for fixed perimeter, each polygon occurs with t…
Limits on additional planetary companions to OGLE-2005-BLG-390L
D. Kubas, A. Cassan, M. Dominik +1
We investigate constraints on additional planets orbiting the distant M-dwarf star OGLE-2005-BLG-390L, around which photometric microlensing data has revealed the existence of the…
Non-minimally coupled multi-scalar black holes
Ben M. Leith, Alex B. Nielsen
We study the static, spherically symmetric black hole solutions for a non-minimally coupled multi-scalar theory. We find numerical solutions for values of the scalar fields when a…
Magnetic properties of the Haldane-gap material NENB
E. Cizmar, M. Ozerov, O. Ignatchik +9
Results of magnetization and high-field ESR studies of the new spin-1 Haldane-chain material [Ni(C2H8N2)2NO2](BF4) (NENB) are reported. A definite signature of the Haldane state in…
Remarks on Dynamical Dark Energy Measured by the Conformal Age of the Universe
Ishwaree P. Neupane
We elaborate on a model of conformal dark energy (dynamical dark energy measured by the conformal age of the universe) recently proposed in [H. Wei and R.G. Cai, arXiv:0708.0884] w…
Gravitational energy as dark energy: Concordance of cosmological tests
Ben M. Leith, S. C. Cindy Ng, David L. Wiltshire
We provide preliminary quantitative evidence that a new solution to averaging the observed inhomogeneous structure of matter in the universe [gr-qc/0702082, arxiv:0709.0732], may l…
Effective Spin-1/2 Description of Transverse-Field-Induced Random Fields in Dipolar Spin Glasses with Strong Single-Ion Anisotropy
S. M. A. Tabei, F. Vernay, M. J. P. Gingras
We present analytical and numerical evidence for the validity of an effective S=1/2 approach to the description of random field generation in S>=1, and especially in an S=1, dipola…
Maximum Likelihood Supertrees
Mike Steel, Allen Rodrigo
We analyse a maximum-likelihood approach for combining phylogenetic trees into a larger `supertree'. This is based on a simple exponential model of phylogenetic error, which ensure…
Complementary algorithms for graphs and percolation
Michael J. Lee
A pair of complementary algorithms are presented. One of the pair is a fast method for connecting graphs with an edge. The other is a fast method for removing edges from a graph. B…
Distribution of phylogenetic diversity under random extinction
Beata Faller, Fabio Pardi, Mike Steel
Phylogenetic diversity is a measure for describing how much of an evolutionary tree is spanned by a subset of species. If one applies this to the (unknown) subset of current specie…
A Note on Agegraphic Dark Energy
Ishwaree P. Neupane
Recently a new model of dynamical dark energy, or time-varying , was proposed by Cai [arXiv:0707.4049] by relating the energy density of quantum fluctuations in a Minkowski spac…
Evidence for gapped spin-wave excitations in the frustrated Gd2Sn2O7 pyrochlore antiferromagnet from low-temperature specific heat measurements
J. A. Quilliam, K. A. Ross, A. G. Del Maestro +3
We have measured the low-temperature specific heat of the geometrically frustrated pyrochlore Heisenberg antiferromagnet Gd2Sn2O7 in zero magnetic field. The specific heat is found…
On the Potential of Large Ring Lasers
G. E. Stedman, R. B. Hurst, K. U. Schreiber
We describe a new ring laser with area A = 833 m^2 and update performance statistics for several such machines. Anandan & Chaio 1982 judged ring lasers inferior to matter interfero…
Dy2Ti2O7 Spin Ice: a Test Case for Emergent Clusters in a Frustrated Magnet
Taras Yavors'kii, Tom Fennell, Michel J. P. Gingras +1
Dy2Ti2O7 is a geometrically frustrated magnetic material with a strongly correlated spin ice regime that extends from 1 K down to as low as 60 mK. The diffuse elastic neutron scatt…
Expected Anomalies in the Fossil Record
Mareike Fischer, Mike Steel
The problem of intermediates in the fossil record has been frequently discussed ever since Darwin. The extent of `gaps' (missing transitional stages) has been used to argue against…
Reconstructing pedigrees: a stochastic perspective
Bhalchandra D. Thatte, Mike Steel
A pedigree is a directed graph that describes how individuals are related through ancestry in a sexually-reproducing population. In this paper we explore the question of whether on…