18,847 research outputs found
Sleeping beauty overture
Thesis (M.A.)--Boston Universit
Evidence for String Substructure
We argue that the behavior of string theory at high temperature and high
longitudinal boosts, combined with the emergence of p-branes as necessary
ingredients in various string dualities, point to a possible reformulation of
strings, as well as p-branes, as composites of bits. We review the string-bit
models, and suggest generalizations to incorporate p-branes.Comment: Latex file, 21 pages, 11 postscript figure
Strong subgroup chains and the Baer-Specker group
Examples are given of non-elementary properties that are preserved under
C-filtrations for various classes C of Abelian groups. The Baer-Specker group
is never the union of a chain of proper subgroups with cotorsionfree quotients.
Cotorsion-free groups form an abstract elementary class (AEC). The Kaplansky
invariants of the Baer-Specker group are used to determine the AECs defined by
the perps of the Baer-Specker quotient groups that are obtained by factoring
the Baer-Specker group B of a ZFC extension by the Baer-Specker group A of the
ground model, under various hypotheses, yielding information about its
stability spectrum.Comment: 12 page
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