Jeffrey Brown

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Eleven dimensional supergravity compactified on T 10 admits classical solutions describing what is known as billiard cosmology – a dynamics expressible as an abstract (billiard) ball moving in the 10-dimensional root space of the infinite dimensional Lie algebra E10, occasionally bouncing off walls in that space. Unlike finite dimensional Lie algebras, E10(More)
We prove a conjecture of Artur Elezi [4] in a generalized form suggested by Givental [5]. Namely, our main result relates genus-0 Gromov–Witten invariants of a bundle space with such invariants of the base, provided that the fiber is a toric manifold. When the base is the point, a new proof of mirror theorems by A. Givental [6] and H. Iritani [9] for toric(More)
After the United Nation’s International Maritime Organization banned the use of organotins in antifouling products, organic booster biocides were introduced as alternatives to these compounds. The purpose of this study was to measure concentrations of the antifouling agent Irgarol 1051, its major metabolite M1 (aka GS26575), and other antifouling pesticides(More)
We study Z2 orbifolds of M-theory in terms of E10. We find a simple relation between the Z2 action on E10 and the imaginary root that corresponds [hepth/0401053] to the “twisted sector” branes. We discuss the connection between the Kac-Moody algebra DE10 and the “untwisted” sector, and we demonstrate how DE18 can describe both the untwisted and twisted(More)
During the summer of 1997, sediment core samples were taken at 25 stations in Santa Monica Bay. Toxicity testing was performed on 4-cm sections of the entire length of each core using purple sea urchin fertilization and amphipod survival tests. The sea urchin test identified sections as being toxic at six stations, all located near current or former(More)
Measurements of the branching ratios of ten Cabibbo suppressed hadronic weak decays of the II+ and Do are presented from data collected with the Mark III detector at SPEAR. In addition to the previously observed channels Do --) K-K+ and T-T+, we report new measurements of Do + r-rr+~O and ?r-n+rr-7rlr+; and D+ + I?OK+ , TOT+, I?*‘(892)K+, r&r+, K-K+x+, and(More)
It is observed that interstitial hydrogen nucleii on a metallic lattice are strongly coupled to their near neighbours by the unscreened electromagnetic field mediating transitions between low-lying states. It is shown that the dominant interaction is of dipole-dipole character. By means of numerical calculations based upon published data, it is then shown(More)
It is observed that interstitial hydrogen nucleii on a metallic lattice are strongly coupled to their near neighbours by the unscreened electromagnetic field mediating transitions between low-lying states. It is shown that the dominant interaction is of dipole-dipole character. By means of numerical calculations based upon published data, it is then shown(More)