منابع مشابه
Knot Concordance
We prove the nontriviality at all levels of the filtration of the classical topological knot concordance group C · · · ⊆ Fn ⊆ · · · ⊆ F1 ⊆ F0 ⊆ C. defined in [COT]. This filtration is significant because not only is it strongly connected to Whitney tower constructions of Casson and Freedman, but all previously-known concordance invariants are related to the first few terms in the filtration. In...
متن کاملLink Concordance, Boundary Link Concordance and Eta-invariants
We study the eta-invariants of links and show that in many cases they form link concordance invariants, in particular that many eta-invariants vanish for slice links. This result contains and generalizes previous invariants by Smolinsky and Cha–Ko. We give a formula for the eta-invariant for boundary links. In several intersting cases this allows us to show that a given link is not slice. We sh...
متن کاملGiant Arc Statistics In Concordance With A Concordance LCDM Universe
The frequency of giant arcs— highly distorted and strongly gravitationally lensed background galaxies— is a powerful test for cosmological models. Previous comparisons of arc statistics for the currently favored concordance cosmological model (a flat lambda-dominated universe) with observations have shown an apparently large discrepancy. We present here new ray-shooting results, based on a high...
متن کاملCosmic Concordance and Quintessence
We present a comprehensive study of the observational constraints on spatially flat cosmological models containing a mixture of matter and quintessence — a time varying, spatially inhomogeneous component of the energy density of the universe with negative pressure. Our study also includes the limiting case of a cosmological constant. We classify the observational constraints by red shift: low r...
متن کاملConcordance of Theoretical Termsy
Scientific theories often contain theoretical terms, such as “electron” and “proton”, that do not refer to observable entities or properties thereof. Within physics the concept of electron is used in theories about electric fields and magnetism. However, within chemistry, the electron is also used in thoeries to predict chemical properties and chemical reactions. While researchers have addresse...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Iowa Review
سال: 1987
ISSN: 0021-065X,2330-0361
DOI: 10.17077/0021-065x.3457