70 research outputs found
A Note On ADE String Compactifications
We address the question whether so-called m-invariants of the N=2 super
Virasoro algebra can be used for the construction of reasonable
four-dimensional string models. It turns out that an infinite subset of those
are pathological in the sense that - although N=2 supersymmetric - the Ramond
sector is not isomorphic to the Neveu-Schwarz sector. Consequently, these two
properties are independent and only requiring both guarantees an N=1 space-time
supersymmetric string spectrum. However, the remaining 529 consistent spectra -
210 of them are mirrors of Gepner models and 76 real orbifolds - show exact
mirror symmetry and are contained in a recent classification of orbifolds of
Gepner models.Comment: 11 pages, plain TeX, no postscript figure
Twisted N=2 Supergravity as Topological Gravity in Four Dimensions
We show that the BRST quantum version of pure D=4 N=2 supergravity can be
topologically twisted, to yield a formulation of topological gravity in four
dimensions. The topological BRST complex is just a rearrangement of the old
BRST complex, that partly modifies the role of physical and ghost fields:
indeed, the new ghost number turns out to be the sum of the old ghost number
plus the internal U(1) charge. Furthermore, the action of N=2 supergravity is
retrieved from topological gravity by choosing a gauge fixing that reduces the
space of physical states to the space of gravitational instanton
configurations, namely to self-dual spin connections. The descent equations
relating the topological observables are explicitly exhibited and discussed.
Ours is a first step in a programme that aims at finding the topological sector
of matter coupled N=2 supergravity, viewed as the effective Lagrangian of type
II superstrings and, as such, already related to 2D topological field-theories.
As it stands the theory we discuss may prove useful in describing gravitational
instantons moduli-spaces.Comment: 38 page
A Large Majorana-Mass From Calabi-Yau Superstring Models
In Calabi-Yau superstring models it is found that two large intermediate
energy scales of symmetry breaking can be induced for special types of the
nonrenormalizable interactions. In the models one set of -singlet,
right-handed neutrino and their mirror chiral superfields is needed. Through
the study of the minimization of the scalarpotential, the conditions for the
presence of two large intermediate scales are obtained. In this scheme a
Majorana-mass possibly amounts to O(10^{9 \sim 10}\gev). This large
Majorana-mass solves the solar neutrino problem and also is compatible with the
cosmological bound for stable light neutrinos.Comment: 12 pages, LaTeX, DPNU-93-41, AUE-06-9
Topological First-Order Systems with Landau-Ginzburg Interactions
We consider the realization of N=2 superconformal models in terms of free
first-order -systems, and show that an arbitrary
Landau-Ginzburg interaction with quasi-homogeneous potential can be introduced
without spoiling the (2,2)-superconformal invariance. We discuss the
topological twisting and the renormalization group properties of these
theories, and compare them to the conventional topological Landau-Ginzburg
models. We show that in our formulation the parameters multiplying deformation
terms in the potential are flat coordinates. After properly bosonizing the
first-order systems, we are able to make explicit calculations of topological
correlation functions as power series in these flat coordinates by using
standard Coulomb gas techniques. We retrieve known results for the minimal
models and for the torus.Comment: 37 page
From toothpick legs to dropping vaginas: Gender and sexuality in Joan Rivers' stand-up comedy performance
This is the author's accepted manuscript. The final published article is available from the link below. Copyright @ 2011 Intellect.This article employs sociocultural analysis to examine Joan Riversâ stand-up comedy performances in order to reveal how she successfully operates in a sphere of artistic expression that has been, and continues to be, male-dominated. The analysis uncovers how Riversâ stand-up comedy performance involves a complex combination of elements and how it fuses features that are regarded as âtraditionally masculineâ, such as aggression, with features frequently used by other female stand-up comedians, such as self-deprecating comedy and confessional comedy. Furthermore, the analysis exposes the complex ways in which constructions of gender and sexuality are negotiated and re-negotiated in Riversâ stand-up comedy performance, and illustrates how dominant ideological identity constructions can be simultaneously reinforced and subverted within the same comic moment
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F.J. Turnerâs âfrontier thesisâ: the ruse of American âcharacter'
American society was transformed by the expansion of capital Westward and the explosion in opportunities that ensued for land grabbing and agricultural and industrial investment. In Turnerâs (1961) frontier thesis this was portrayed as resulting in the emergence of âthe new manâ i.e. the fulfilment of American character. The frontier thesis is a neo-Darwinian contribution. It posits exceptionalism and transcendence as the keys to American character. The gene pool of the Americans, thriving in a new geographical and social environment, is depicted as achieving a higher level of development than the stratified societies of Old Europe. What the thesis ignores is the importance of orthodox Eurocentric strategies of colonization and land appropriation. Turner portrays pioneer/settler society as a heroic departure, but in many ways, it is a continuation of European precedents. Analogously, the proposition that the push West crystallized American character obscures the role of personality, especially in urban-industrial settings, in establishing the parameters of American life. Turner conceived of character as emerging from a struggle with the spatial frontier. But the struggles of personality with the social frontier of repression and establishment values is no less significant. The paper examines the tensions between character and personality by using some ideas developed by Carl Schmitt on the significance of âthe opportunityâ in competitive advantage. The importance of the opportunity and personality in developing the American way of life are examined by the vaudeville and celebrity traditions. The exploitation of contingency for personal advantage, the use of melodrama to engineer social impact, the social validation of forthright behaviour are examined in the context of the careers of the film actress Mae West and the comedian Bob Hope
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