193,298 research outputs found
Constraining Post_Newtonian Parameters With Gravitational Waves
We re-express gravitational wave results in terms of post-Newtonian
parameters. Using these expressions, and some simplifying assumptions, we
compute that in a favorable case, i.e. a ten solar-mass black hole spiraling in
to a 10^6 solar-mass black hole, LISA observations will be able to constrain at
the 10% level or better a single combination of post-post-Newtonian parameters
one order higher than those already constrained by solar system evidence. This
significant constraint will be possible even if the signal-to-noise level is so
low that the signal can only be found by matched filtering, and hence only
deviations between alternate signal interpretations of order one half cycle or
more can be detected.Comment: 8 pages, abbreviated version to be submitted to conference
proceedings Twentieth Texas Symposium on Relativistic Astrophysics, Eds. J.
Craig Wheeler and Hugo Marte
"The Land of Liberty": Henry Bibb's Free Soil Geographies
This essay situates "The Narrative of the Life and Adventures of Henry Bibb, An American Slave" within the political context of the antislavery Free Soil movement, arguing that Bibb's representations of land and labor reflect the concerns of Free Soil. In particular, it argues that Bibb's narrative simultaneously critiques Free Soil ideology for its lack of a full-throated call for immediate abolition and its privileging of the white working class over both free and enslaved Black people. In addition, these aspects of Bibb’s Free Soil critique—
both in condemning slavery and in reflexively challenging elements of Free Soil ideology—are more ecological than established Free Soil discourse, reflecting a deeper, more sensitive, and more radical understanding of material interconnection in regards to bodies, means of production, and topographies
A herding perspective on global games and multiplicity
Recently, it has been claimed that full-information multiple equilibria in games with strategic complementarities are not robust, because generalizing to allow slightly heterogeneous information implies uniqueness. This paper argues that this "global games" uniqueness result is itself not robust. If we generalize by allowing most agents to observe a few previous actions before choosing, instead of forcing players to move exactly simultaneously, then multiplicity of outcomes is restored. Only a small sample of observations is needed to make our herding equilibrium behave like a full-information sunspot equilibrium instead of a global games equilibrium
Education and Acculturation on Malaita: An Ethnography of Intraethnic and Interethnic Affinities
One of the central issues in educational anthropology is the changing nature of intraethnic and interethnic conflict and relationships. Conventional modernization theory suggests that the acculturation process will tend to diminish traditional allegiances and affinities. There are, however, indications that the opposite may occur. This essay reports on research into this issue undertaken on Malaita, in the Solomon Islands. The research method was sociometric and involved examination of the ethnic identity and affinities of individuals within the Malaitan language-groups, namely, the AreAre, Baegu, Baelelea, Dorio, Fataleka, Kwai Island, Kwaio, Kwara’ae, Langalanga, Lau, Sa’a and To’abaita language-groups. From this, I draw some conclusions on the acculturation process on Malaita, as well as what individuals in mass societies might learn from such language-group societies
Goals of the ARISE Space VLBI Mission
Supermassive black holes, with masses of 10^6 to more than 10^9 solar masses,
are among the most spectacular objects in the Universe, and are laboratories
for physics in extreme conditions. The primary goal of ARISE (Advanced Radio
Interferometry between Space and Earth) is to use the technique of Space VLBI
to increase our understanding of black holes and their environments, by imaging
the havoc produced in the near vicinity of the black holes by their enormous
gravitational fields. The mission will be based on a 25-meter space-borne radio
telescope operating at frequencies between 8 and 86 GHz, roughly equivalent to
an orbiting element of the Very Long Baseline Array. In an elliptical orbit
with an apogee height of 40,000-100,000 km, ARISE will provide resolution of 15
microarcseconds or better, 5-10 times better than that achievable on the
ground. At frequencies of 43 and 86 GHz, the resolution of light weeks to light
months in distant quasars will complement the gamma-ray and X-ray observations
of high-energy photons, which come from the same regions near the massive black
holes. At 22 GHz, ARISE will image the water maser disks in active galaxies
more than 15 Mpc from Earth, probing accretion physics and giving accurate
measurements of black-hole masses. ARISE also will study gravitational lenses
at resolutions of tens of microarcseconds, yielding important information on
the dark-matter distribution and on the possible existence of compact objects
with masses of 10^3 to 10^6 solar masses.Comment: 6 pages, New Astronomy Reviews, Proceedings of 4th EVN/JIVE
Symposium, LaTeX, document class elsart.cls, bibliography style natbib.st
Age, growth and life history of Klamath River Basin steelhead trout (Onchorhynchus mykiss irideus) as determined from scale analysis
Adult steelhead (Oncorhynchus mykiss irideus) scales were analyzed from eight fall-run, two spring-run, and one winter-run stocks within the Klamath-Trinity River system, from 1981 through 1983, to provide basic information on age, growth, and life history. The higher degree of half-pounder occurrence of upper Klamath River steelhead stocks (86.7 to 100%) compared to Trinity River steelhead stocks (32.0 to 80.0%) was the major life history difference noted in scale analysis. Early life history was similar for all areas sampled with most juveniles (86.4%) remaining in freshwater during the first two years of life before migrating to sea. Repeat spawning ranged from 17.6 to 47.9% for fall-run, 40.0 to 63.6% for spring-run, and 31.1% for winter-run steelhead. Mean length of adults at first spawning was inversely related to percent half-pounder occurrence in each stock. Ages of returning spawners, back calculated lengths at various life stages, and growth information are presented. (PDF contains 22 pages
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