4,885 research outputs found
Variant supercurrent multiplets
In N = 1 rigid supersymmetric theories, there exist three standard
realizations of the supercurrent multiplet corresponding to the (i) old
minimal, (ii) new minimal and (iii) non-minimal off-shell formulations for N =
1 supergravity. Recently, Komargodski and Seiberg in arXiv:1002.2228 put
forward a new supercurrent and proved its consistency, although in the past it
was believed not to exist. In this paper, three new variant supercurrent
multiplets are proposed. Implications for supergravity-matter systems are
discussed.Comment: 11 pages; V2: minor changes in sect. 3; V3: published version; V4:
typos in eq. (2.3) corrected; V5: comments and references adde
Calcite-aragonite speleothems from a hand-dug cave in Northeast Kansas
Speleothems in the form of stalactites, linear stalactitic growths, flowstone, and crusts, from a hand-dug cave in Northeast Kansas (Sec. 2 NENW, T2S, R22E) are composed of calcite and aragonite. If the estimated age of the cave is correct, i.e., 150 to 200 years old, the stalactites have grown at a maximum rate of 0.20 to 0.15 millimetres per year along their vertical axes. All of the speleothems examined contain about one percent strontium (based on qualitative emission spectrograph analyses). Rate of supply and evaporation of the vadose waters may dictate whether aragonite or calcite is the polymorph that precipitates from the cave waters
Complete Lagrangian formulation for N=4 topological string
We give a Lagrangian and display all local symmetries for N=4 topological
string by Berkovits, Vafa and Siegel, the latter previously known in the
superconformal gauge. Leading to a small N=4 superconformal algebra and
exhibiting the manifest Lorentz invariance the model is proposed to be a
framework for restoring the manifest Lorentz invariance in N=2 string
scattering amplitudes.Comment: 8 pages, LaTex. One reference corrected, to appear in Phys. Rev.
Green-Schwarz Formulation of Self-Dual Superstring
The self-dual superstring has been described previously in a
Neveu-Schwarz-Ramond formulation with local N=2 or 4 world-sheet supersymmetry.
We present a Green-Schwarz-type formulation, with manifest spacetime
supersymmetry.Comment: 11 pg., (uuencoded dvi file) ITP-SB-92-5
Energy and width measurements of low-Z pionic X-ray transitions
High resolution spectrometric measurement of energy and natural line widths of 2p-1s pionic X ray transitions, as well as muonic transition energies in Li, Be, B, and C isotope
A new measurement of the lifetime of the positive pion
Digital timing method for measuring positive pion lifetim
Self-Dual N=8 Supergravity as Closed N=2(4) Strings
As open N=2 or 4 strings describe self-dual N=4 super Yang-Mills in 2+2
dimensions, the corresponding closed (heterotic) strings describe self-dual
ungauged (gauged) N=8 supergravity. These theories are conveniently formulated
in a chiral superspace with general supercoordinate and local OSp(8|2) gauge
invariances. The super-light-cone and covariant-component actions are analyzed.
Because only half the Lorentz group is gauged, the gravity field equation is
just the vanishing of the torsion.Comment: 17 pg., (uuencoded dvi file; revision: forgot 1 stupid term in the
last equation) ITP-SB-92-3
Random lattice superstrings
We propose some new simplifying ingredients for Feynman diagrams that seem
necessary for random lattice formulations of superstrings. In particular, half
the fermionic variables appear only in particle loops (similarly to loop
momenta), reducing the supersymmetry of the constituents of the Type IIB
superstring to N=1, as expected from their interpretation in the 1/N expansion
as super Yang-Mills.Comment: Section 5 which describes contributions of the string measure adde
Twistor string as tensionless superstring
We give a brief review of the twistor string approach to supersymmetric
Yang-Mills theories with an emphasis on the different formulations of
(super)string models in supertwistor space and their superspace form. We
discuss the classical equivalence among the Siegel closed twistor string and
the Lorentz harmonics formulation of the (N=4) tensionless superstring, and
notice the possible relation of the twistor string to the D=10 Green-Schwarz
superstring action, as well as to models in the enlarged, tensorial superspaces
that are relevant in higher spin theories.Comment: plain latex, 9 pages. Talk delivered at the Workshop of the RTN
network 'Constituents, fundamental forces and Symmetries of the Universe',
Napoli October 9-13, 2006, to appear in Fortschritte der Physi
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