157,608 research outputs found
Generalized Slow Roll for Non-Canonical Kinetic Terms
We show that the generalized slow-roll approach for calculating the power
spectrum where the inflationary slow roll parameters are neither small nor
slowly varying can be readily extended to models with non-canonical kinetic
terms in the inflaton action. For example, rapid sound speed variations can
arise in DBI models with features in the warp factor leading to features in the
power spectrum. Nonetheless there remains a single source function for
deviations that is simply related to the power spectrum. Empirical constraints
on this source function can be readily interpreted in the context of features
in the inflaton potential or sound speed.Comment: 4 pages, minor changes reflect PRD accepted versio
Inferring Narrative Causality between Event Pairs in Films
To understand narrative, humans draw inferences about the underlying
relations between narrative events. Cognitive theories of narrative
understanding define these inferences as four different types of causality,
that include pairs of events A, B where A physically causes B (X drop, X
break), to pairs of events where A causes emotional state B (Y saw X, Y felt
fear). Previous work on learning narrative relations from text has either
focused on "strict" physical causality, or has been vague about what relation
is being learned. This paper learns pairs of causal events from a corpus of
film scene descriptions which are action rich and tend to be told in
chronological order. We show that event pairs induced using our methods are of
high quality and are judged to have a stronger causal relation than event pairs
from Rel-grams
Chern-Weil homomorphism in twisted equivariant cohomology
AbstractWe describe the Cartan and Weil models of twisted equivariant cohomology together with the Cartan homomorphism among the two, and we extend the Chern–Weil homomorphism to the twisted equivariant cohomology. We clarify that in order to have a cohomology theory, the coefficients of the twisted equivariant cohomology must be taken in the completed polynomial algebra over the dual Lie algebra of G. We recall the relation between the equivariant cohomology of exact Courant algebroids and the twisted equivariant cohomology, and we show how to endow with a generalized complex structure the finite-dimensional approximations of the Borel construction M×GEGk, whenever the generalized complex manifold M possesses a Hamiltonian G-action
Comment on "Single-mode excited entangled coherent states"
In Xu and Kuang (\textit{J. Phys. A: Math. Gen.} 39 (2006) L191), the authors
claim that, for single-mode excited entangled coherent states , \textquotedblleft the photon excitations lead to the
decrease of the concurrence in the strong field regime of and
the concurrence tends to zero when ". This is wrong.Comment: 4 apges, 2 figures, submitted to JPA 15 April 200
Effect of Hot Baryons on the Weak-Lensing Shear Power Spectrum
We investigate the impact of the intracluster medium on the weak-lensing
shear power spectrum (PS). Using a halo model we find that, compared to the
dark matter only case, baryonic pressure leads to a suppression of the shear PS
on the order of a few percent or more for . Cooling/cooled
baryons and the intergalactic medium can further alter the shear PS. Therefore,
the interpretation of future precision weak lensing data at high multipoles
must take into account the effects of baryons.Comment: 4 pages, 3 figure
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