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20 papers · 1 filter
Warped product Einstein metrics over spaces with constant scalar curvature
Chenxu He, Peter Petersen, William Wylie
In this paper we study warped product Einstein metrics over spaces with constant scalar curvature. We call such a manifold rigid if the universal cover of the base is Einstein or i…
Theoretical Study of the Soft Optic Mode Scattering in a Relaxor Ferroelectric: the Strong Effect of the Depolarizing Fields
Eugene Iolin
We analyze scattering of the transverse optic modes by spherically symmetric Polarized Nano Regions (PNR) in the paraelectric phase of relaxor ferroelectrics. Calculations have don…
Chern-Simons classes and the Ricci flow on 3-manifolds
Christopher Godbout
In 1974, S.-S. Chern and J. Simons published a paper where they defined a new type of characteristic class - one that depends not just on the topology of a manifold but also on the…
Sparse Inverse Covariance Selection via Alternating Linearization Methods
Katya Scheinberg, Shiqian Ma, Donald Goldfarb
Gaussian graphical models are of great interest in statistical learning. Because the conditional independencies between different nodes correspond to zero entries in the inverse co…
The Be Star HD 215227: A Candidate Gamma-ray Binary
S. J. Williams, D. R. Gies, R. A. Matson +4
The emission-line Be star HD 215227 lies within the positional error circle of the newly identified gamma-ray source AGL J2241+4454. We present new blue spectra of the star, and we…
H-alpha Emission Variability in the gamma-ray Binary LS I +61 303
M. Virginia McSwain, Erika D. Grundstrom, Douglas R. Gies +1
LS I +61 303 is an exceptionally rare example of a high mass X-ray binary (HMXB) that also exhibits MeV-TeV emission, making it one of only a handful of "gamma-ray binaries". Here…