NORDITA   NEWS   1996 / 6                       December 1, 1996

PROFESSORSHIP IN ASTROPHYSICS AT NORDITA
As was stated in the previous Nordita News, this position will be open in January 1998, on the retirement of Bernard Pagel. The Board has set up a committee whose members are Claes Fransson (Stockholm), Igor Novikov (Copenhagen), Sir Martin Rees (Cambridge), Hector Rubinstein (Uppsala), and Chris Pethick (Nordita, Chair, pethick@nordita.dk) to advise it. If you have views about desirable subject areas for the appointment, or wish to suggest suitable candidates, you are invited to contact members of the committee. Nordic physicists are invited in addition to contact members of the Nordita subfield committee in astrophysics, chaired by Claes Fransson (fransson@astro.su.se), or their national representative on the Nordita Board, concerning the form of the announcement. A list of the committee members is given in http://www.nordita.dk/locinfo/subcom.html.

NORDIC PROJECTS AND CORRESPONDING FELLOWS 1997
At its meeting on 5 November 1996, Nordita's Board decided to renew the following Nordic projects: ``Non-Linear Phenomena in Accretion Disk Around Black Holes'' organized by M. Abramowicz; ``Supersymmetric Theories'' organized by P. Di Vecchia; ``Computational Materials and Surface Physics'' organized by B. Lundqvist; ``Fundamental Constituents of Matter'', organized by P. Osland; ``The Nature of Gamma Ray Bursts'' organized by R. Svensson; ``Relativistic Heavy Ion Collisions'' organized by H. Heiselberg, L. Csernai, and V. Ruuskanen. The support is granted for a period of one year. In addition, M. Abramowicz, Goeteborg, B. Lundqvist, Goeteborg, and S. Aberg, Lund will continue as corresponding fellows. L. Thorlacius, (Princeton), who has been a regular visitor at Nordita, will continue his affiliation with the institute.

POSTDOCS IN NUCLEAR ASTROPHYSICS
UNIVERSITY OF AARHUS
The Institute for Physics and Astronomy of the University of Aarhus invites applicants for Postdoctoral positions in Nuclear Astrophysics to be filled in 1997. The candidates are expected to have a strong background and research interest in (nuclear) many-body theory and its application to astrophysics. Interested candidates should send their letter of application, along with a curriculum vitae, list of publications and three letters of recommendation before February 3, 1997 to Professor K. Langanke, Institute for Physics and Astronomy, Ny Munkegade/Building 520, DK-8000 Aarhus C, Denmark.

BOARD MEETINGS
Nordita's Board will meet on the following dates in 1997: 10 - 11 March (Copenhagen), 13 -14 June (Jyvaeskylae), and 3-5 November (Copenhagen).

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Items for Nordita News
If you have any information about meetings, etc. that would be useful to include in Nordita News, please send it to Nordita, att.: Jette Nielsen, Blegdamsvej 17, DK-2100 Copenhagen OE, Denmark or by e-mail: nielsen@nordita.dk. Nordita News appears on the first day of even numbered months, and material should be sent at least 3 weeks before the publication date.

COURSES / CONFERENCES / WORKSHOPS

NEW DEVELOPMENTS WITH STRONGLY CORRELATED ELECTRONS
December 12-14, 1996, Nordita, Copenhagen
A small workshop is planned to discuss recent analytical work in the field of strongly correlated two-dimensional electrons, with applications to high Tc superconductors and the Quantum Hall Effect. Among suggested topics of interest are the problems of the square Fermi surface and the related problem of calculating correlation functions in the exactly solvable one-dimensional models (particularly, the XXZ model in a magnetic field), as well as the non-Fermi liquid behavior in Quantum Hall states at even denominator fractions and the bosonization of the effective Fermi surface of composite fermions.
Participants include: Yu Lu (Trieste), R. Hlubinal (Bratislava), I. Dzyaloshinskii (Irvine), F. Essler (Oxford), H. Frahm (Hannover), H. Johannesson (Goeteborg)**, T. Kopp (Karlsruhe), S. Strong (Princeton), A. Sudboe (Trondheim), A. Tsvelik* (Oxford), A. Zuyagin (Goeteborg)*. *Waiting for visas/**uncertain (still).
If you are interested and would like to participate, or have suggestions, please send a message to the workshop secretary (pedersen@nordita.dk). Organizers: Per Hedegaard, H.C. OErsted Institute, Dima Khveshchenko, Nordita, (khvesh@nordita.dk), and Alan Luther, Nordita, (luther@nordita.dk).

ASPECTS OF SUBNUCLEAR PHYSICS IN THE NORDIC AREA
December 16-17, 1996, Nordita, Copenhagen
Informal meeting on aspects of Subnuclear Physics in the Nordic Area at Nordita, December 16-17, 1996 (in connection with the meeting of the committee of subnuclear physics).
During this meeting there will be 7 general 30 min. talks on nuclear and particle physics by: Sven Aberg, Hans Bijnens, Kari Enqvist, Henning Heiselberg, Jens Lyng Petersen, Bo-Sture Skagerstam, and Jan Vaagen.

NORDIC MEETING ON MEDIUM AND HIGH ENERGY NUCLEAR PHYSICS
January 7-11, 1997, Graeftaavallen, Sweden
The meeting will take place at Graeftaavallen in central Sweden, January 7-11, 1997 (with January 6 and 12 for travel). This biennal symposium is a long-term Nordic collaboration tradition. This time, it will be arranged by Jan Blomgren (main organizer), (e-mail: bumpen@tsl.uu.se), Juha AEystoe, Laszlo Csernai and Henning Heiselberg.

PHYSICS OF STRUCTURALLY DISORDERED MATERIALS
14 - 16 February 1997, Univ. of Jyvaeskylae, Finland
Topics in the conference include spatial correlations and percolation in disordered networks together with their elastic properties, cluster growth and sedimentation, dynamics of diffusion fronts and acoustic waves, and flow in random porous media. Invited lecturers: P.M. Duxbury; A. Hansen; M.H. Jensen; J. Kertesz; J. Krug; L.K. Kurnaz; A.J.C. Ladd; N. Provatas; S.Schwarzer; M.F. Thorpe. The registration deadline for the conference is 15 January 1997. Organizing committee: T. Ala-Nissilae (Univ. of Helsinki), M.J. Alava, K. Kaski, R. Nieminen (Helsinki Univ. of Technolgy), and J. Timonen (Univ. of Jyvaeskylae). For more information please contact: Ms. Marja Korhonen (conference secretary), e-mail: korhonen@jyfl.jyu.fi, Faculty of Mathematics and Natural Sciences, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae, Finland, phone: +358-14 602 205, fax: +358 14 602 201. Further information also available at: http//www.physics.helsinki.fi/$\sim$ala/MATRA.html.

DYNAMICAL PROPERTIES OF UNCONVENTIONAL MAGNETIC SYSTEMS
April 2 - 12, 1997, Bardoela Hoeyfjellshotel, Geilo, Norway
The objective of this Advanced Study Institute is to present in a pedagogical manner the current experimental and theoretical knowledge of the dynamical properties of unconventional magnetic systems (low-dimensional and mesoscopic magnetism, unconventional ground states, quantum magnets, soft matter etc.) that are important for an understanding of co-operative phenomena, fluctuations and excitations. Principal lecturers: G. Aeppli, I. Affleck, A. Aharony, D. Awschalom, C.P. Bean, C. Broholm, R. Cowley, P. Gruenberg, D. Loss, P. Nordblad, S.S.P. Parkin, R. Pynn, S. Sachdev, D. Sherrington, A.T. Skjeltorp, and H. Zabel. Topics: Frustrated magnets; Giant - and colossal magnetoresistance; Haldane gap; Low-dimensional magnetism; Magnetic multilayers; Magnetic quantum critical points; Magnetism in soft matter; Mesoscopic magnetism; Quantum magnets; Skyrmions; Spin liquids; Spin-Peierls gap; Spin solitons; Unconventional ground states. Topics will cover both experiments and theory. The advanced study institute is intended for postgraduates involved in research on condensed matter physics, statistical physics and materials science. The number of participants will be limited to about 75. Deadline for application is January 1. For further information please contact: Mary Byberg, Institute for Energy Technology, P.O. Box 40, N-2007 Kjeller, Norway, email: fysikk@ife.no, phone: +47-63 80 60 75, and fax: +47 63 81 09 20. More information is available on http://www.ife.no/physics/ASI97.html.

NORDITA MASTER CLASS IN PHYSICS
July 26 - August 2, 1997, Nordita, Copenhagen
This school for undergraduate students will be organized at NORDITA during the period July 26 - August 2, 1997. Four hot physics topics will be covered by internationally renowned physicists. The school aims to show undergraduate students how interesting physics is, and to inspire them to make their own excursions in the field. The school is open to students with at least three years university study in physics, or corresponding studies at technical university, but who have not embarked upon a PhD programme. About 45 Nordic and Baltic students will be selected on the basis of their grades in physics/mathematics together with a recommendation letter from a teacher. The school is organized by the Educational Committee at Nordita through its chairman Sven Aberg (Lund/Nordita, e-mail: Sven.Aberg@matfys.lth.se), and is sponsored by NordPlus and Nordita. Deadline for application: March 15th, 1997. http://www.matfys.lth.se/~sven/masterclass97.html.

FOURTH NORDIC SUMMER SCHOOL IN NUCLEAR PHYSICS
August 11 - 22, 1997, Falsterbo, Sweden
The fourth Nordic Summer School in Nuclear Physics will take place in Falsterbo, Sweden, August 11-22, 1997. The preliminary list of topics is: Nuclear Structure - Basic Ideas; Standard Model - Basic Ideas; Euroball Physics; Physics with Radioactive Beams; Hadron Physics; Electron Probes; Ultrarelativistic Collisions; Chaotic Phenomena. The school is aimed at graduate students in experimental as well as in theoretical physics. The main emphasis is on nuclear physics, but we also welcome students from other areas of physics who would like to learn about modern nuclear physics. The school is open to students from all parts of the world, but with priority for Nordic and Baltic students. The school is organized by Sven Aberg (Lund/Nordita, e-mail: Sven.Aberg@matfys.lth.se) and Ben Mottelson (Nordita/Trento), and is supported by NorFA. Deadline for application: April 1st, 1997. More information is available on http://www.matfys.lth.se/~sven/falsterbo97.html.

TRENDS IN PHYSICS:
A PROGRAM FOR YOUNG GRADUATE STUDENTS
August 17-29, 1997, at Nordita, Copenhagen.
Nordita is planning a two-week program for young graduate students from the Nordic countries and neighbouring areas. This will include lectures, demonstrations, working sessions and visits to other scientific centers. The organizers are: Henning Heiselberg (hh@nordita.dk), Thomas Bohr, Dima Khveshchenko, Jesper Sommer-Larsen and Larry McLerran, and more information will be available shortly.

VISITORS AT NORDITA / NBI / CATS / TAC

The fields are listed after the names as: A (Astrophysics), C (Complex Systems & Chaos), N (Nuclear Physics), P (Particle Physics), and S (Condensed Matter Physics).
If you are interested in having any of these people visit your institute, please contact NORDITA.

LONG-TERM VISITORS AT NORDITA

PREPRINTS / REPRINTS

G. Akemann, P.H. Damgaard, U. Magnea, and S. Nishigaki: Universality of random matrices in the microscopic limit and the Dirac operator spectrum. 96/59.

D.V. Khveshchenko and M. Reizer: Non Fermi liquid renormalization of the conductivity of fermions coupled to gauge fields. 96/62

P. Hoyer: A perturbative gluon condensate ? 96/63.

V. Braun and L. Magnea: Renormalons and power corrections in QCD. 96/64.

V.M. Braun: Theoretical uncertainties in the determination of $\alpha_{s}$ from hadronic event observables: the impact of nonperturbative effects. 96/65.

M. Billo, M. Caselle, A. D'Adda, and S. Panzeri: Finite temperature lattice QCD in the large $N$ limit. 96/66.

G. Gustafson, H. Kharraziha, and L. Loennblad: The LDC event generator. 96/67.

S.J. Brodsky, P. Hoyer, and L. Magnea: Rapidity gaps in perturbative QCD. 96/68.

J. Bijnens and P. Talavera: $\pi \to \l\nu \gamma$ form factors at two-loop. 96/69.

J. Bijnes and J. Prades: Electromagnetic corrections for pions and kaons: masses and polarizabilities. 96/70.

H. Heiselberg and A.P. Vischer: Many-particle correlations in relativistic nuclear collisions. 96/71.

P. Di Vecchia, L. Magnea, R. Marotta, A. Lerda, and R. Russo: The field theory limit of multiloop string amplitudes. 96/73.

P. Diener, V.P. Frolov, A.M. Khokhlov, I.D. Novikov, and C.J. Pethick: Relativistic tidal interaction of stars with a rotating black hole. TAC, August 1996.

I.V. Artemova, G.S. Bisnovatyi-Kogan, G. Bjoernsson, and I.D. Novikov: Structure of accretion disks with optically thick-optically thin transitions. The Astrophys. J. 456 (1996) 119-123.

I.V. Artemova, G. Bjoernsson, and I.D. Novikov: Modified Newtonian potentials for the description of relativistic effects in accretion disks around black holes. The Astrophys. J. 461 (1996) 565-571.

I.V. Artemova, G.S. Bisnovatyi-Kogan, G. Bjoernsson, and I.D. Novikov: Highly viscious accretion disks with advection.

A. Carlini, D.H. Coule, and D.M. Solomons: Classical and quantum wormholes with perfect fluids and scalar fields. Mod. Phys. Lett. A11 (1996) 1453-1465.

M. Billo, M. Caselle, A. D'Adda, and S. Panzeri: Toward an analytic determination of the deconfinement temperature in SU(2) lattice gauge theory. Nucl. Phys. B472 (1996) 163-193.

A. Brandenburg, K. Enqvist, and P. Olesen: Large-scale magnetic fields from hydromagnetic turbulence in the very early universe. Phys. Rev. D54 (1996) 1291.

J. Bijnens and E. Pallante:} On the tensor formulation of effective vector lagrangians and duality transformations. Mod. Phys. Lett. A11 (1996) 1069-1080.

J. Bijnens, G. Colangelo, G. Ecker, J. Gasser, and M.E. Sainio: Elastic $\pi \pi$ scattering to two loops. Phys. Lett. B374 (1996) 210-216.

P. Talavera, Ll. Amettler, J. Bijnens, A. Bramon, and F. Cornet: $\gamma \gamma \rightarrow \pi \pi \pi$ to one loop in chiral perturbation theory. Phys. Lett. B376 (1996) 186-192.

J. Bijnens: Chiral lagrangians and Nambu-Jona-Lasinio like models. Physics Reports 265 (1996) 369-448.

C.J. Pethick and D.G. Ravenhall: The dependence of neutron skin thickness and surface tension on neutron excess. Nucl. Phys. A606 (1996) 173-182.

B. Eynard and C.F. Kristjansen: More on the exact solution of the $O(n)$ model on a random lattice and an investigation of the case $|n| > 2$. Nucl. Phys. B 466 (1996) 463-487.

OVERVIEW OF FUTURE NORDITA and OTHER CONFERENCES