5,272 research outputs found
Four-loop contributions to long-distance quantities in the two-dimensional nonlinear sigma-model on a square lattice: revised numerical estimates
We give the correct analytic expression of a finite integral appearing in the
four-loop computation of the renormalization-group functions for the
two-dimensional nonlinear sigma-model on the square lattice with standard
action, explaining the origin of a numerical discrepancy. We revise the
numerical expressions of Caracciolo and Pelissetto for the perturbative
corrections of the susceptibility and of the correlation length. For the values
used in Monte Carlo simulations, N=3, 4, 8, the second perturbative correction
coefficient of the correlation length varies by 3%, 4%, 3% respectively. Other
quantities vary similarly.Comment: 2 pages, Revtex, no figure
Composite operators from the operator product expansion: what can go wrong?
The operator product expansion is used to compute the matrix elements of
composite renormalized operators on the lattice. We study the product of two
fundamental fields in the two-dimensional sigma-model and discuss the possible
sources of systematic errors. The key problem turns out to be the violation of
asymptotic scaling.Comment: Lattice 99 (Improvement and Renormalization), 3 pages, 3 eps figure
Application of a coordinate space method for the evaluation of lattice Feynman diagrams in two dimensions
We apply a new coordinate space method for the evaluation of lattice Feynman
diagrams suggested by L\"uscher and Weisz to field theories in two dimensions.
Our work is to be presented for the theories with massless propagators. The
main idea is to deal with the integrals in position space by making use of the
recursion relation for the free propagator which allows to compute the
propagator recursively by its values around origin. It turns out that the
method is very efficient and gives very precise results. We illustrate the
technique by evaluating a number of two- and three-loop diagrams explicitly.Comment: 25 pages, Latex, 2 figures, revised by discussing some points in more
detail and correcting a few typo
Flocking together : collective animal minds in contemporary fiction
The remarkable coordination displayed by animal groups such as an ant colony or a flock of birds in flight is not just a behavioral feat; it reflects a full-fledged form of collective cognition. Building on work in philosophy, cognitive approaches to literature, and animal studies, I explore how contemporary fiction captures animal collectivity. I focus on three novels that probe different aspects of animal assemblages: animals as a collective agent (in Richard Powers's The Echo Maker), animals that communicate a shared mind through dance-like movements (in Lydia Davis's The Cows), and animals that embrace a collective "we" to critique the individualism of contemporary society (in Peter Verhelst's The Man I Became). When individuality drops out of the picture of human-animal encounters in fiction, empathy becomes abstract: a matter of quasi-geometric patterns that are experienced by readers through an embodied mechanism of kinesthetic resonance
Form, science, and narrative in the anthropocene
A significant strand of contemporary fiction engages with scientific models that highlight a constitutive interdependency between humanity and material realities such as the climate or the geological history of our planet. This article looks at the ways in which narrative may capture this human-nonhuman interrelation, which occupies the foreground of debates on the so-called Anthropocene. I argue that the formal dimension of scientific knowledge-as manifested by diagrams or metaphors used by scientists-is central to this narrative remediation. I explore two analogical strategies through which narrative may pursue a formal dialogue with science: clusters of metaphorical language and the global structuring of the plot. Rivka Galchen's novel Atmospheric Disturbances (2008), for instance, builds on a visual representation of meteorological patterns in a storm (lifted from an actual scientific paper) to stage the narrator's mental illness. Two other contemporary works (Orfeo by Richard Powers and A Tale for the Time Being by Ruth Ozeki) integrate scientific models through the overall design of the plot. By offering close readings of these novels, I seek to expand work in the area of New Formalism and show how formal choices are crucial to bringing together the human-scale world and more-than-human phenomena
Comparison between Theoretical Four-Loop Predictions and Monte Carlo Calculations in the Two-Dimensional -Vector Model for
We have computed the four-loop contribution to the beta-function and to the
anomalous dimension of the field for the two-dimensional lattice -vector
model. This allows the determination of the second perturbative correction to
various long-distance quantities like the correlation lengths and the
susceptibilities. We compare these predictions with new Monte Carlo data for . From these data we also extract the values of various universal
nonperturbative constants, which we compare with the predictions of the
expansion.Comment: 68456 bytes uuencoded gzip'ed (expands to 155611 bytes Postscript); 4
pages including all figures; contribution to Lattice '9
Large-N_f chiral transition in the Yukawa model
We investigate the finite-temperature behavior of the Yukawa model in which
fermions are coupled with a scalar field in the limit . Close to the chiral transition the model shows a crossover between
mean-field behavior (observed for ) and Ising behavior (observed
for any finite ). We show that this crossover is universal and related to
that observed in the weakly-coupled theory. It corresponds to the
renormalization-group flow from the unstable Gaussian fixed point to the stable
Ising fixed point. This equivalence allows us to use results obtained in field
theory and in medium-range spin models to compute Yukawa correlation functions
in the crossover regime
Testing the efficiency of different improvement programs
We study the finite-size behaviour of a tree-level on-shell improved action
for the N-vector model. We present numerical results for N=3 and analytic
results in the large-N limit for the mass gap. We also report a perturbative
computation at one loop of the mass gap for states of spatial momentum p. We
present a detailed comparison of the behaviour of this action with that of
other formulations, including the perfect action, and a critical discussion of
the different approaches to the problem of action improvement.Comment: LaTex2e, 34 pages, 5 ps figures, uses epsf, epsfig, amsfont, cite.st
- …