4,378 research outputs found
Quantizing the line element field
A metric with signature (-+++) can be constructed from a metric with
signature (++++) and a double-sided vector field called the line element field.
Some of the classical and quantum properties of this vector field are studied.Comment: 9 page
P-model Alternative to the T-model
Standard linguistic analysis of syntax uses the T-model. This model
requires the ordering: D-structure S-structure LF,
where D-structure is the deep structure,
S-structure is the surface structure, and LF is logical form.
Between each of these representations there is movement which alters
the order of the constituent words; movement is achieved using the principles
and parameters of syntactic theory. Psychological analysis of sentence
production is usually either serial or connectionist. Psychological serial
models do not accommodate the T-model immediately so that here a new model
called the P-model is introduced. The P-model is different from previous
linguistic and psychological models. Here it is argued that the LF
representation should be replaced by a variant
of Frege's three qualities (sense, reference, and force),
called the Frege representation or F-representation.
In the F-representation the order of elements is not necessarily the same as
that in LF and it is suggested that the correct ordering is:
F-representation D-structure S-structure.
This ordering appears to lead to a more natural
view of sentence production and processing. Within this framework movement
originates as the outcome of emphasis applied to the sentence. The
requirement that the F-representation precedes the D-structure needs a picture
of the particular principles and parameters which pertain to movement of words
between representations. In general this would imply that there is a
preferred or optimal ordering of the symbolic string in the F-representation.
The standard ordering is retained because the general way of producing
such an optimal ordering is unclear. In this case it is possible to produce
an analysis of movement between LF and D-structure similar to the usual
analysis of movement between S-structure and LF.
It is suggested that a maximal amount of information about
a language's grammar and lexicon is stored,
because of the necessity of analyzing corrupted data
Exact Nonnull Wavelike Solutions to Gravity with Quadratic Lagrangians
Solutions to gravity with quadratic Lagrangians are found for the simple case
where the only nonconstant metric component is the lapse and the Riemann
tensor takes the form ; thus these
solutions depend on cross terms in the Riemann tensor and therefore complement
the linearized theory where it is the derivatives of the Riemann tensor that
matter. The relationship of this metric to the null gravitational radiation
metric of Peres is given. Gravitaional energy Poynting vectors are construcetd
for the solutions and one of these, based on the Lanczos tensor, supports the
indication in the linearized theory that nonnull gravitational radiation can
occur.Comment: 16 pages, no tables or diagrams, LaTex2
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