1,701 research outputs found
Teaching Through Discussion as the Exercise of Disciplinary Power
The French philosopher Michel Foucault spent much of his lifetime analyzing the way in which power flows through all human interactions, including those of discussion groups within higher education. His analysis of disciplinary power and surveillance is directly applicable to the practice of discussion-based teaching
Astrophysical Configurations with Background Cosmology: Probing Dark Energy at Astrophysical Scales
We explore the effects of a positive cosmological constant on astrophysical
and cosmological configurations described by a polytropic equation of state. We
derive the conditions for equilibrium and stability of such configurations and
consider some astrophysical examples where our analysis may be relevant. We
show that in the presence of the cosmological constant the isothermal sphere is
not a viable astrophysical model since the density in this model does not go
asymptotically to zero. The cosmological constant implies that, for polytropic
index smaller than five, the central density has to exceed a certain minimal
value in terms of the vacuum density in order to guarantee the existence of a
finite size object. We examine such configurations together with effects of
in other exotic possibilities, such as neutrino and boson stars, and
we compare our results to N-body simulations. The astrophysical properties and
configurations found in this article are specific features resulting from the
existence of a dark energy component. Hence, if found in nature would be an
independent probe of a cosmological constant, complementary to other
observations.Comment: 23 pages, 11 figures, 2 tables. Reference added. Mon. Not. Roy.
Astro. Soc in prin
Program Planning Principles, Goals, and Evaluation Criteria in the Radical Adult Education Tradition
The purpose of this paper is to present what we consider to be essential principles, goals, and evaluation criteria, for program planning in the radical adult education tradition. The paper is based on historical and philosophical inquiry into the pedagogical practices of numerous social movements and social movement organizations
Nonlinearity in Market Efficiency: Comparison study of Malaysia, London and Singapore.
It is argued that the efficiency in futures market depends on the nature of trading activity in futures and on its relation to the underlying security. Much of the studies in this are only focus on the linear relationship between this instruments and little has been done using the nonlinearity test
Race and Racism: A Critical Dialogue
This is a dialogue between Elizabeth Peterson, a black, female adult educator and Stephen Brookfield, a white male. The question was whether or not we could come together and engage in a critical dialogue about race and racism
Mass-varying neutrino in light of cosmic microwave background and weak lensing
We aim to constrain mass-varying neutrino models using large scale structure
observations and produce forecast for the Euclid survey. We investigate two
models with different scalar field potential and both positive and negative
coupling parameters \beta. These parameters correspond to growing or decreasing
neutrino mass, respectively. We explore couplings up to |\beta|<5. In the case
of the exponential potential, we find an upper limit on <0.004
at 2- level. In the case of the inverse power law potential the null
coupling can be excluded with more than 2-\sigma significance; the limits on
the coupling are \beta>3 for the growing neutrino mass and \beta<-1.5 for the
decreasing mass case. This is a clear sign for a preference of higher
couplings. When including a prior on the present neutrino mass the upper limit
on the coupling becomes |\beta|<3 at 2- level for the exponential
potential. Finally, we present a Fisher forecast using the tomographic weak
lensing from an Euclid-like experiment and we also consider the combination
with the cosmic microwave background (CMB) temperature and polarisation spectra
from a Planck-like mission. If considered alone, lensing data is more efficient
in constraining with respect to CMB data alone. There is, however,
a strong degeneracy in the \beta- plane. When the two data sets
are combined, the latter degeneracy remains, but the errors are reduced by a
factor ~2 for both parameters.Comment: 5 pages, 6 figures. Now published in A&A 500, 657-665 (2009
Binomial Ideals and Congruences on Nn
Producción CientíficaA congruence on Nn is an equivalence relation on Nn that is compatible with the additive structure. If k is a field, and I is a binomial ideal in k[X1,…,Xn] (that is, an ideal generated by polynomials with at most two terms), then I induces a congruence on Nn by declaring u and v to be equivalent if there is a linear combination with nonzero coefficients of Xu and Xv that belongs to I. While every congruence on Nn arises this way, this is not a one-to-one correspondence, as many binomial ideals may induce the same congruence. Nevertheless, the link between a binomial ideal and its corresponding congruence is strong, and one may think of congruences as the underlying combinatorial structures of binomial ideals. In the current literature, the theories of binomial ideals and congruences on Nn are developed separately. The aim of this survey paper is to provide a detailed parallel exposition, that provides algebraic intuition for the combinatorial analysis of congruences. For the elaboration of this survey paper, we followed mainly (Kahle and Miller Algebra Number Theory 8(6):1297–1364, 2014) with an eye on Eisenbud and Sturmfels (Duke Math J 84(1):1–45, 1996) and Ojeda and Piedra Sánchez (J Symbolic Comput 30(4):383–400, 2000).National Science Foundation (grant DMS-1500832)Ministerio de Economía, Industria y Competitividad (project MTM2015-65764-C3-1)Junta de Extremadura (grupo de investigación FQM-024
Phase transition in the fine structure constant
Within the context of mass-varying neutrinos, we construct a cosmological
model that has a phase transition in the electromagnetic fine structure
constant \alpha at a redshift of 0.5. The model accommodates hints of a time
variable \alpha in quasar spectra and the nonobservance of such an effect at
very low redshifts. It is consistent with limits from the recombination and
primordial nucleosynthesis eras and is free of instabilities.Comment: 6 pages, 1 figure. Version to appear in PL
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