51,002 research outputs found
Note on Backlund transformations
The method of obtaining Backlund transformations proposed by Chern and Tenenblat (1986) fits completely the approach of obtaining Backlund transformations by prolongation techniques. For KdV, MKdV and sine-Gordon equations the only difference consists in the application of a non-linear representation of the prolongation algebra other than the usual one. This representation can be obtained by a coordinate transformation of the prolongation variabl
Search for Bs -> mu mu and B0 -> mu mu decays in CMS
A search for the rare decays (Bs -> \mu \mu) and (B0 -> \mu\mu) performed in
pp collisions at sqrt{s} = 7 TeV is presented. The data sample, collected by
the CMS experiment at the LHC, corresponds to an integrated luminosity of 1.14
/fb. In both cases the number of events observed after all selection
requirements is consistent with expectations from background and standard model
signal predictions. The resulting upper limits on the branching fractions are
BF(Bs -> \mu\mu) \mu \mu) < 4.6 * 10^{-9} at 95%
confidence level (CL). Furthermore, the combination of the results of the
search for the decay (Bs -> \mu \mu) by the CMS and LHCb experiments is
presented. The combined upper limit is BF < 1.1 * 10^{-8} at 95% CL.Comment: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011),
Paris, France, November 14-18 2011, 3 pages, 5 figur
Prolongation structure and lax representation of the boomeron equation
An Estabrook-Wahlquist prolongation structure and a Lax representation for the Boomeron equation introduced by Calogero and Degasperis is determined
On Ideas in Motion in Baghdad and Beyond
Note on Damien Janos (ed.), Ideas in Motion in Baghdad and Beyond. Philosophical and Theological Exchanges between Christians and Muslims in the Third/Ninth and Fourth/Tenth Centuries, (Islamic History and Civilization. Studies and Texts, 124), Brill: Leiden–Boston, 201
Why does Low-Luminosity AGN Fueling Remain an Unsolved Problem?
Despite many years of effort, observational studies have not found a strong
correlation between the presence of any proposed fueling mechanism and
low-luminosity AGN. After a discussion of the mass requirements for fueling, I
summarize this observational work and provide a number of hypotheses for why
the nature of AGN fueling has remained unresolved. In particular, I stress the
potential importance of the increasing number of candidate fueling mechanisms
with decreasing mass accretion rate, the relevant spatial scales for different
fueling mechanisms, and the lifetime of an individual episode of nuclear
accretion. The episodic AGN lifetime is a particularly relevant complication if
it is comparable to or shorter than the time that the responsible fueling
mechanisms are observationally detectable. I conclude with a number of
relatively accessible areas for future investigation.Comment: 7 pages, 2 figures. Invited review to appear in "The Interplay among
Black Holes, Stars and ISM in Galactic Nuclei," Proc. IAU 222 (Gramado,
Brazil), eds. Th. Storchi Bergmann, L.C. Ho, H.R. Schmit
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