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1.
We constructN=2 affine current algebras for the superalgebrassl(n/n-1)(1) in terms ofN=2 supercurrents subjected to nonlinear constraints and discuss the general procedure of the hamiltonian reduction inN=2 superspace at the classical level. We consider in detail the simplest case ofN=2sl(2/1)(1) and show howN=2 superconformal algebra inN=2 superspace follows via the hamiltonian reduction. Applying the hamiltonian reduction to the case ofN=2sl(3/2)(1), we find two new extendedN=2 superconformal algebras in a manifestly supersymmetricN=2 superfield form. Decoupling of four component currents of dimension 1/2 in them yields, respectively,u(2/1) andu(3) Knizhnik-Bershadsky superconformal algebras. We also discuss how theN=2 superfield formulations ofN=2W
3 andN=2W
3
(2) superconformal algebras come out in this framework, as well as some unusual extendedN=2 superconformal algebras containing constrainedN=2 stress tensor and/or spin 0 supercurrents. 相似文献
2.
Parity-invariant three-dimensional gauge theories with N=2 extended supersymmetry are studied by the heat kernel method. The parity-anomalous part of the one-loop effective action is exactly found. It is expressed in terms of the N=2 supersymmetric Chern-Simons term and is identified as a N=2 superspace Atiyah-Patodi-Singer eta-invariant. 相似文献
3.
A. S. Lalleman G. Auger W. Mittig M. Chabert M. Chartier J. Fermé A. Gillibert A. Lépine-Szily M. Lewitowicz M. H. Moscatello N. A. Orr G. Politi F. Sarazin H. Savajols P. Van Isacker A. C. C. Villari 《Hyperfine Interactions》2001,132(1-4):313-320
Mass measurements of the N=Z nuclei 80Zr, 76Sr, 68Se were performed for the first time and a new measurement was obtained for 80Y, using the second cyclotron CSS2 of GANIL as a high-resolution spectrometer. Ions around N=Z were produced by fusion-evaporation in the inverse 58Ni (4.32MeVA) + 24Mg and 12C reactions. New masses were measured by a time-of-flight method, with a precision of 2⋅10−6, by using well-known masses as references. Study of the double binding energy difference δV
np is then performed leading to a strong N=Z Wigner effect around N=Z=40. Knowledge of new masses in this region also plays a crucial role in the modelling of the astrophysical rp process.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
D. D. Warner 《Physics of Atomic Nuclei》2001,64(6):1015-1019
The role played by isospin in nuclear structure phenomena encountered on the N=Z line is discussed. New results on Coulomb energy differences (CED) at high spin for odd-A nuclei in the f 7/2 shell are presented and interpreted in the framework of a simple Cranked Shell Model treatment involving an exact numerical diagonalisation. Results for the CED between the A=46 even-even mirror pairs are also discussed. The CED between the T=1 states in N=Z odd-odd nuclei and their isobaric analogues are suggested as a possible probe of np pairing on the N=Z line. First results from a numerical diagonalization of IBM-4 are cited. 相似文献
5.
We propose and prove a trinomial version of the celebrated Bailey's lemma. As an application we obtain new fermionic representations
for characters of some unitary as well as nonunitary models of N= 2 superconformal field theory (SCFT). We also establish interesting relations between N= 1 and N= 2 models of SCFT with central charges and . A number of new mock theta function identities are derived.
Dedicated to Dora Bitman on her 70th birthday
Received: 8 March 1997 / Accepted: 29 June 1997 相似文献
6.
Ground-state properties of even-even nuclei were calculated over a broad region of mass numbers, including nuclei that contain a neutron excess in the vicinity of the neutron drip line. The calculation of the properties of such nuclei relied on the method of the relativistic and the nonrelativistic mean field and took into account the axial deformation of nuclei. Particular attention was given to nuclei beyond the theoretical neutron drip line, which form a peninsula of nuclei in the (N, Z) space at N = 184 that are stable against the emission of one or two neutrons.
相似文献7.
Yu. P. Goncharov 《JETP Letters》1998,67(12):1082-1089
We describe U(N) monopoles (N>1) on Kerr black holes by the parameters of the moduli space of holomorphic vector U(N) bundles over S
2 with the help of the Grothendieck splitting theorem. For N=2, 3 we estimate the corresponding monopole masses.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 12, 1021–1026 (25 June 1998)
Published in English in the original Russian journal. Edited by Steve Torstveit. 相似文献
8.
José M. Figueroa-O'Farrill 《Communications in Mathematical Physics》1996,177(1):129-156
Let
be a finite-dimensional Lie algebra (not necessarily semisimple). It is known that if
is self-dual (that is, if it possesses an invariant metric) then it admits anN=1 (affine) Sugawara construction. Under certain additional hypotheses, thisN=1 structure admits anN=2 extension. If this is the case,
is said to possess anN=2 structure. It is also known that anN=2 structure on a self-dual Lie algebra
is equivalent to a vector space decomposition
, where
are isotropic Lie subalgebras. In other words,N=2 structures on
in one-to-one correspondence with Manin triples
. In this paper we exploit this correspondence to obtain a classification of thec=9N=2 structures on solvable Lie algebras. In the process we also give some simple proofs for a variety of Lie algebras. In the process we also give some simple proofs for a variety of Lie algebraic results concerning self-dual Lie algebras admitting symplectic or Kähler structures. 相似文献
9.
We investigate Bianchi V cosmological models containing two interacting scalar fields. These models are derived from a dimensional reduction of theN=2,D=5 supergravity theory. Exact solutions are found. 相似文献
10.
The pressure broadening, pressure shift coefficients, and absolute intensities have been obtained for theJ= 6 ← 5 and theJ= 5 ← 4 absorption lines of acetonitrile CH3CN at 110 and 92 GHz, respectively. The absorption line shapes have been directly recorded modulating the radiation beam by an optical chopper. In addition to the self-effects, the foreign-broadening coefficients have also been measured for N2, O2, and Ar. 相似文献
11.
We investigate Bianchi VI0 cosmological models containing two interacting scalar fields. These models are derived from a dimensional reduction of theN=2,D=5 supergravity theory. Exact solutions are found and the existence of singularities for them is considered. 相似文献
12.
Yu. E. Penionzhkevich 《Hyperfine Interactions》2006,171(1-3):157-166
The present work reviews the properties of the neutron-rich isotopes near the closed shells N = 20 and N = 28. The changes in nuclear structure appearing as one goes away from the β-stability line are discussed. The location of
the neutron drip line and questions about the stability of nuclides with Z ≥ 8 are considered in connection with the weakening or even vanishing of the shell effects at the magic numbers 20 and 28,
and the discovery of the new neutron magic numbers at N = 16 and N = 32. These properties are extremely interesting from the point of view of laser experiments as well as for all other experimental
methods giving access to this region. 相似文献
13.
《Journal of Nonlinear Mathematical Physics》2013,20(4):526-538
Abstract The N=2 super-KP equation associated with nonstandard flows is bilinearized using the Hirota method and soliton solutions are obtained. The bilinearization has been done for component fields and its KdV limit is discussed by comparing the soliton solutions obtained by this procedure with those found from the N=1 superspace formalism. The equivalence of these two procedures in the KdV limit is observed. 相似文献
14.
F. Sarazin H. Savajols W. Mittig F. Nowacki N. A. Orr Z. Ren P. Roussel-Chomaz G. Auger D. Baiborodin A. V. Belozyorov C. Borcea E. Caurier Z. Dlouhý A. Gillibert A. S. Lalleman M. Lewitowicz S. M. Lukyanov F. de Oliveira Y. E. Penionzhkevich D. Ridikas O. Tarasov H. Sakuraï A. de Vismes 《Hyperfine Interactions》2001,132(1-4):147-152
A mass measurement experiment by a time of flight method with the SPEG spectrometer at GANIL has been performed to investigate
the N=20 and N=28 shell closures far from stability. The masses of 31 neutron-rich nuclei in the range A=29–47 have been measured. The precision of 19 masses has been significantly improved and 12 masses were measured for the
first time. The neutron-rich Cl, S and P isotopes are seen to exhibit a change in shell structure around N=28. Comparison with shell model and relativistic mean field calculations demonstrate that the observed effects arise from
deformed prolate ground state configurations associated with shape coexistence. The evidence of an isomeric state in the 43S and its interpretation by a shell model calculation confirm the analysis of the masses and constitutes the first evidence
of the predicted shape coexistence around N=28.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
15.
V. Abramov 《Czechoslovak Journal of Physics》1998,48(11):1265-1272
We study realizations of the q-exterior calculus with exterior differential d satisfying d
N = 0, N > 2 on the free associative algebra with one generator and on the generalized Clifford algebras. Analogs of the notions of connection and curvature are discussed in the case of the q-exterior calculus on the generalized Clifford algebra. We show that the q-exterior calculus on the free associative algebra with one generator is related to q-calculus on the braided line. 相似文献
16.
The isospin dependence of shell closure phenomena is studied for light neutron-rich nuclei within a microscopic self-consistent
approach using the Gogny force. Introducing configuration mixing, 32Mg is found to be dynamically deformed, although the N = 20 spherical shell closure persists at the mean-field level for all N = 20 isotones. In contrast, the N = 28 spherical shell closure is found to disappear for N - Z≥ 10 whereas deformed shell closures are preserved and lead to shape coexistence in 44
S. Configuration mixing shows that the ground state of this nucleus is triaxially deformed. The first 2+ excitation energy Ex = 1.46 MeV and the reduced transition probability B(E2;0+
gs→ 2+
1)= 420 e
2
fm
4 obtained with our approach are in good agreement with experimental data.
Received: 26 July 2000 / Accepted: 30 August 2000 相似文献
17.
18.
19.
Let M be a quasi-regular compact connected Sasakian manifold, and let N = M/S 1 be the base projective variety. We establish an equivalence between the class of Sasakian G–Higgs bundles over M and the class of parabolic (or equivalently, ramified) G–Higgs bundles over the base N. 相似文献
20.
V. A. Yatsun 《Letters in Mathematical Physics》1988,15(1):7-11
A general representation for a quasi-self-dual gauge field which is a generalization of the 't Hooft ansatz is obtained in the Euclidean conformally invariant Yang-Mills theory with a sextuplet of real scalar fields-the boson sector of N=4 supersymmetric Yang-Mills theory. The existence of an O(4)-symmetric quasi-self-dual solution in the region g
2>0 is proved. An explicit example of the quasi-self-dual instanton in the region g
2<0 is constructed. 相似文献