Olaf Lechtenfeld Publications 07/21 References [1] U. Abresch, A. Bovier, O. Lechtenfeld, M. L¨uling, V. Rittenberg and G. Weymans, Finite nonabelian subgroups of SU(n) with analytic expressions for the irreducible representations and the Clebsch–Gordan coefficients, J. Math. Phys. 21 (10) (1980) 2481. [2] O. Lechtenfeld, Systematische Behandlung von Bindungszust¨anden in der QED, Bonn University internal report (1982), in German, unpublished. [3] K. Dietz, O. Lechtenfeld and G. Weymans, Optimised mean fields for atoms I. Mean-field methods for the description of N-fermion systems, J. Phys. B: At. Mol. Phys. 15 (1982) 4301–4314. [4] K. Dietz, O. Lechtenfeld and G. Weymans, Optimised mean fields for atoms II. Numerical studies, J. Phys. B: At. Mol. Phys. 15 (1982) 4315–4330. [5] R. Flume and O. Lechtenfeld, On the stochastic structure of globally supersymmetric field theories, Phys. Lett. B 135 (1984) 91–95. [6] O. 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[20] O. Lechtenfeld and S. Samuel, Off-shell conformal methods for the superstring, Nucl. Phys. B 310 (1988) 254–290. [21] O. Lechtenfeld and S. Samuel, Gauge-invariant modification of Witten’s open superstring, Phys. Lett. B 213 (1988) 431–438. [22] O. Lechtenfeld, On the finiteness of the superstring, Nucl. Phys. B 322 (1989) 82–106. [23] O. Lechtenfeld and A.J. Parkes, On covariant multi-loop superstring amplitudes, Nucl. Phys. B 332 (1990) 39–82. [24] O. Lechtenfeld and W. Lerche, On non-renormalization theorems for four-dimensional superstrings, Phys. Lett. B 227 (1989) 373–380. [25] O. Lechtenfeld, Superconformal ghost correlations on Riemann surfaces, Phys. Lett. B 232 (1989) 193–198. [26] O. Lechtenfeld, Factorization and modular invariance of multi-loop superstring amplitudes in the unitary gauge, Nucl. Phys. B 338 (1990) 403–414. [27] M. Dine, W. Fischler, O. Lechtenfeld, J. Polchinski and B. Sakita, Baryon number violation at high temperature in the Standard Model, Nucl. Phys. B 342 (1990) 381–408. [28] O. Lechtenfeld, High energy versus high temperature — a Minkowskian point of view of baryon number violation in the Standard Model, Talk at the Santa Fe Workshop on “Baryon Number Violation at the SSC?”, 27–30 April 1990, Proceedings, eds. Mattis & Mottola, pp.139–160, World Scientific, 1990. [29] O. Lechtenfeld, R. Ray and A. Ray, Phase diagram and orthogonal polynomials in multiple-well matrix models, Int. J. Mod. Phys. A 6 (1991) 4491–4515. 2 [30] O. Lechtenfeld, Chaos in matrix models?, Contribution to “Quarks, Symmetries and Strings: A Symposium in Honor of Bunji Sakita’s 60th Birthday”, New York City, 01–02 October 1990, eds. Kaku, Jevicki & Kikkawa, pp.149–163, World Scientific, 1991. [31] O. Lechtenfeld, Eigenvalue tunneling in matrix models, Int. J. Mod. Phys. A 7 (1992) 2335–2354. [32] O. Lechtenfeld, hep-th/9112045 Semiclassical approach to finite-N matrix models, Int. J. Mod. Phys. A 7 (1992) 7097–7118. [33] O. Lechtenfeld and C.R. Nappi, hep-th/9204026 Dilaton gravity and no-hair theorem in two dimensions, Phys. Lett. B 288 (1992) 72–76. [34] O. Lechtenfeld, hep-th/9312124 Collective field theory for D=0 matrix models, Talk at the 27th Int. Symposium Ahrenshoop on the Theory of Elementary Particles, Wendisch-Rietz, Germany, 07–11 Sept. 1993, Proceedings: pp. 32–44, DESY preprint 94-053. [35] S.V. Ketov, O. Lechtenfeld and A.J. Parkes, hep-th/9312150 Twisting the N=2 string, Phys. Rev. D 51 (1995) 2872–2890. [36] J. Bischoff, S.V. Ketov and O. Lechtenfeld, hep-th/9406101 The GSO projection, BRST cohomology and picture-changing in N=2 string theory, Nucl. Phys. B 438 (1995) 373–410. [37] S.V. Ketov and O. Lechtenfeld, Twisting and BRST cohomology of the N=2 string, Talk by S.V.K. at the 20th Yamada International Colloquium on Group Theoretical Methods in Physics, 04–09 July 1994, Toyonaka, Japan, eds. Arima, Eguchi & Nakanishi, pp. 272–277, World Scientific, 1995. [38] O. Lechtenfeld and S. Samuel, hep-th/9411001 Four-dimensional twisted group lattices, Nucl. Phys. B 449 (1995) 406–432. [39] O. Lechtenfeld and S. Samuel, hep-th/9412197 The solution of the d-dimensional twisted group lattices, Int. J. Mod. Phys. A 11 (1996) 3227–3246. [40] O. Lechtenfeld, hep-th/9412242 From N=2 fermionic strings to superstrings?, Talk at the 28th Int. Symposium Ahrenshoop on the Theory of Elementary Particles, Wendisch-Rietz, Germany, 30 August – 04 Sept. 1994, Proceedings: pp. 16–28, DESY preprint 95-027. [41] O. Bechmann and O. Lechtenfeld, gr-qc/9502011 Exact black-hole solution with self-interacting scalar field, Class. Quantum Grav. 12 (1995) 1473–1482. [42] S.V. Ketov and O. Lechtenfeld, hep-th/9503232 The string measure and spectral flow of critical N=2 strings, Phys. Lett. B 353 (1995) 463–470. 3 [43] O. Lechtenfeld, hep-th/9508100 On the BRST cohomology of N=2 strings, Talk at the Int. Conference “Strings ’95”, USC, 13–18 March 1995, Proceedings: pp. 309–310, Strings ’95, World Scientific, 1996. [44] O. Lechtenfeld, hep-th/9512189 Integration measure and spectral flow in the critical N=2 string, Talk at the 29th Int. Symposium Ahrenshoop on the Theory of Elementary Particles, Buckow, Germany, 29 August – 02 Sept. 1995, Proceedings: Nucl. Phys. B (Proc. Suppl.) 49 (1996) 51–56. [45] O. Lechtenfeld, hep-th/9607106 The self-dual critical N=2 string, Talk at the X Intern. Conference “Problems of Quantum Field Theory”, Alushta, Crimea, Ukraine, 13–18 May 1996, Proceedings: pp. 348–354, Dubna preprint JINR E2-96-369. [46] J. Bischoff and O. Lechtenfeld, hep-th/9608196 Restoring reality for the self-dual N=2 string, Phys. Lett. B 390 (1997) 153–160. [47] H. Dennhardt and O. Lechtenfeld, gr-qc/9612062 Scalar deformations of Schwarzschild holes and their stability, Int. J. Mod. Phys. A 13 (1998) 741–764. [48] J. Bischoff and O. Lechtenfeld, hep-th/9612218 Path-integral quantization of the (2,2) string, Int. J. Mod. Phys. A 12 (1997) 4933–4972. [49] O. Lechtenfeld and W. Siegel, hep-th/9704076 N=2 worldsheet instantons yield cubic self-dual Yang–Mills, Phys. Lett. B 405 (1997) 49–54. [50] Ch. Devchand and O. Lechtenfeld, hep-th/9712043 Extended self-dual Yang–Mills from the N=2 string, Nucl. Phys. B 516 (1998) 255–272. [51] K. J¨unemann and O. Lechtenfeld, hep-th/9712182 Chiral BRST cohomology of N=2 strings at arbitrary ghost and picture number, Commun. Math. Phys. 203 (1999) 53–69. [52] Ch. Devchand and O. Lechtenfeld, hep-th/9801117 On the self-dual geometry of N=2 strings, Talk by O.L. at the 31st Int. Symposium Ahrenshoop on the Theory of Elementary Particles, Buckow, Germany, 02–06 Sept. 1997, Proceedings: “Theory of Elementary Particles”, ed. H. Dorn, Wiley-VCH 1998, pp. 58–63. [53] Ch. Devchand and O. Lechtenfeld, hep-th/9808053 String-induced Yang–Mills coupling to self-dual gravity, Nucl. Phys. B 539 (1999) 309–328. [54] O. Lechtenfeld and A.S. Sorin, solv-int/9810009 Fermionic flows and tau function of the N=(1|1) superconformal Toda lattice hierarchy, Nucl. Phys. B 557 [PM] (1999) 535–547. [55] O. Lechtenfeld and B. Zupnik, hep-th/9812244 Manifestly invariant actions for harmonic self-dual gauge theory, unpublished. 4 [56] K. J¨unemann, O. Lechtenfeld and A.D. Popov, hep-th/9901164 Non-local symmetries of the closed N=2 string, Nucl. Phys. B 548 (1999) 449–474. [57] A. Galajinsky and O. Lechtenfeld, hep-th/9903149 Towards a stringy extension of self-dual super Yang–Mills, Phys. Lett. B 460 (1999) 288–294. [58] O. Lechtenfeld and A.S. Sorin, solv-int/9907021 Supersymmetric KP hierarchy in N=1 superspace and its N=2 reductions, Nucl.