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The State of the Department

The State of the Department

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The State of the Department

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  1. Paul Grannis, Sept. 14, 2004 The State of the Department

  2. Department Staff Paul Grannis, Chairman Pam Burris, Assistant to Chairman Laszlo Mihaly, Director of Graduate Studies Pat Peiliker, Assistant Director of Graduate Studies Emilio Mendez, Director of Undergraduate Studies Elaine Larsen, Assistant Director of Undergraduate Studies Bob Segnini, Director of Physical Labs Rich Berscak, Building Manager Sara Lutterbie, Business Manager Diane Siegel, Main Office Maria Hofer, Main Office Joe Feliciano & Frank Chin, Instructional Labs. Chuck Pancake, Electronics Center Walter Schmeling, Machine Shop Sal Natale, Receiving

  3. New faculty New appointments: Adam Durst, condensed matter theory. Adam studies high Tc superconductors and 2-dimensional electron gases. Adam is presently a postdoc with Subdir Sachev at Yale. He will join Stony Brook in January 2005. Science June 18 – Cooking a 2-dimensional electron gas with microwaves

  4. New faculty Dominik Schneble, atomic physics experiment. Dominik studies strongly correlated atoms in optical lattices. Dominik has just completed a postdoc at MIT with Wolfgang Ketterle. He will arrive in Stony Brook in January 2005. He and wife Elisa just had a baby girl on Sept. 5.

  5. News of the faculty Welcome back to those on the faculty who were on leave last year: Phil Solomon Peter Stephens Tom Kuo Dima Averin Michael Gurvitch On leave this year: Barbara Jacak Chris Jacobsen (fall) Chang Kee Jung (spring) Janos Kirz Ken Lanzetta Kostya Likharev (spring) Jim Lukens Mike Marx Edward Shuryak (spring) Bill Weisberger (spring)

  6. News of the faculty A special welcome back to Peter Paul after 6 years as Deputy for Science and Technology and Acting Interim Director at Brookhaven Lab.

  7. News of the faculty • Axel Drees was promoted to full professor • Concha Gonzalez-Garcia and John Hobbs were promoted to associate professor • Janos Kirz has been named Interim Director of Advanced Light Source at Lawrence Berkeley National Laboratory • Peter van Nieuwenhuizen was elected “Ridder in de Orde van de Nederlandse Leeuw” (knight of the order of the Dutch lion) • Norbert Pietralla won the Academy Prize for Physics from Academy of Sciences in Göttingen • Edward Shuryak was Dirac Lecturer at University of New South Wales in March and won the Dirac Medal

  8. News of the faculty • Hal Metcalf was elected to the chair line (vice chair) of the Division of Laser Science of the APS • Laszlo Mihaly received the Chancellor’s Award for Excellence in Teaching • George Sterman was named the 2004 Distinguished Alumnus by the University of Maryland Physics Department • Chang Kee Jung was given an Academy of Teacher-Scholar Award • Vladimir Litvinenko (BNL, adjunct in dep’t) was made APS Fellow. Vladimir won the 2004 Free Electron Laser Prize for "outstanding contributions for the Free electron Laser science and technology".

  9. News of the faculty Cover of 9/12/03 PRL: Brodsky, A.S. Goldhaber, J. Lee Feynman diagram illustrating an alternative production mechanism for glueballs; the glueball (a bound-gluon state predicted by QCD) is accompanied by a charmonium state H. The calculated cross section for this process in e+e- annihilation suggests that recent anomalous results from the Belle Collaboration may be due in part to production of charmonium-glueball pairs. KOPIO experiment (~$50M) approved by Congress as NSF MRE project; Mike Marx is project leader. Ko→ pon n decay is a clean and direct measure of CP violation. Barbara Jacak featured on NPR “Talk of the Nation: Science Friday” on Jan. 20, 2004, discussing the new RHIC quark gluon plasma results. Barbara has also joined a distinguished roster of speakers at NSF, exploring the science future for ‘Quarks and the Cosmos’ Ken Lanzetta conceived and organized “Astronomers Under Glass”, a public analysis of Hubble Deep Field images at the Rose Center of the American Museum of Natural History in March.

  10. News of the faculty CERN Courier, May 2004: article by M. Rocek and G. Sterman on result from 1st Simons Workshop in 2003: “Space goes quantum at Stony Brook” Does a melting crystal provide the key to developing a quantum description of gravity? Advances at the first Simons Workshop point to a connection. This year’s workshop just finished: Superstrings and Topological Strings

  11. Adjunct Faculty The department made new adjunct faculty appointments to: Praveen Chaudhari – BNL Director, materials science Jim Davenport – theoretical condensed matter physics at BNL Peter Johnson – experimental condensed matter physics at BNL David Sayre – retired from IBM, affiliated with the x-ray optics group Jin Wang – theoretical physics of biology, Asst. Prof. in SB Chemistry Also appointed those outside the department who are supervising PhD theses on 1 year renewable terms as affiliated or adjunct faculty.

  12. Graduate student PhDs awarded Aug. 2003: (18 degrees) Lilia Anguelova Univ. Michigan postdoc Seth Aubin Univ. Toronto postdoc Tigran Bacarian Tirthabir Biswas McGill Univ. Fernando Camino Stony Brook postdoc Javier Cardona Univ. de los Andes faculty Matthew Cashen Stanford postdoc Alberto Iglisias New York Univ. postdoc Jiangyong Jia Colombia postdoc Bertram Klein GSI Darmstadt postdoc Takeshi Koike Stony Brook postdoc Peter Langfelder Perimeter Inst., Waterloo CA postdoc Mathew Malek Fermilab postdoc

  13. Graduate student PhDs awarded August 2003 cont’d Jaan Mannik Stony Brook postdoc Filipe Moura Ecole Polytechnique postdoc Joe Reiner NIST postdoc Kevin Schultz Ohio State postdoc John Wilson Duke medical imaging postdoc December 2003 (7 degrees) Yiing-rei Chen Columbia chemistry postdoc Gary Gluckman Radiation Oncology, Stony Brook Loic Grandchamp-Desraux Lawrence Berkeley Lab postdoc Athanasios Hatzikoutelis Univ. Virginia postdoc Oleg Kritsun Stony Brook postdoc Tianfang Li Stony Brook medical imaging postdoc Tevfik Mentes INFN Trieste postdoc

  14. Graduate student PhDs awarded May 2004 (7 degrees) Tobias Beetz Brookhaven Nat’l Lab Nathan Clisby Univ. Melbourne postdoc Alok Gambhir Stony Brook medical school Tibor Kucs Deutsche Bank, London Diyar Talbayev William & Mary postdoc Zhong Min Wang Radiation oncology, Univ. Penn Valeriu Zetocha Financial industry in New York August 2004 (1 degree) Marian Zdrazil Lawrence Berkeley Lab postdoc

  15. Graduate student degrees awarded MSI, May 2004 (2 degrees) Bob Azmoun BNL tech position Susan Metz Photon Research Associates Stony Brook is one of the leading universities in number of Ph.D. degrees granted. Ranking of 2001-2 PhDs granted 1. Illinois/Champaign Urbana 33 2. MIT 32 3. Stony Brook 29 3. Texas Austin 29 5. Harvard 27 6. Ohio State 25 7. UC Berkeley 23 8. Cornell 22 9. Stanford 20 10. UC San Diego 18 In 2003-4: 32 PhDs

  16. Incoming graduate students Almeida Leandro Florida Inst. Technology US Amparo Denis Joseph Ateneo de Manila Univ. Philippines Anderson William Gettysburg College US Chen Chin-Hao National Taiwan Univ. Taiwan Clow Stephen Portland State, Rice Univ. US Dai Peng Nanjing Univ. China Dixon Keri Univ. Illinois Urbana/Champain US Dusling Kevin Cooper Union US Faherty Jacqueline Notre Dame, Columbia US Farley Christopher Fordham Univ. US Goodson Jeremiah Univ. Colorado, Boulder US Grimes Jacob Southwest Texas State US Haeming Marc Univ. Würzburg Germany Huang Lei USTC China Johannsen Tim Univ. Würzburg Germany Jung Jay Hoon Sungkyun Univ. Korea Kamin Jason Hampshire College US Knochel Alexander Univ. Würzburg Germany Krejca Brian U. Mass Lowell/U. Illinois UC US Kuo Yueh-Cheng National Taiwan Univ. Taiwan

  17. Incoming graduate students Lapidus Saul Rochester Inst. Technology US Lepzelter David MIT US Li Rundong Beijing University China Liao Jinfeng Tsinghua Univ. China Lim Yeunhwan Seoul National Univ. Korea Lin Shu Beijing Univ. China Lopez Glenn Univ. Michigan US Means Nathan Cornell College US Nesteroff James Clarkson Univ. US Patu Ionel Univ. Bucharest Romania Pomoni Elli Univ. Athens Greece Reeves Jason Knox College US Riedmann Matthias Univ. Würzburg Germany Ryb Itai Hebrew Univ. Jerusalem Israel Schiff Philip Truman State Univ. US Shen Xiao Fudan Univ. China Staedele Verena Konstanz Germany Steinbrener Jan Univ. Würzburg Germany Stewart Steven SUNY Oneonta US Stone Kevin Univ. California Berkeley US

  18. Incoming graduate students Strauss Emanuel Johns Hopkins Univ. US Tan Zhongkui Beijing Univ. China Tschann-Grimm Kathryn UCLA US Xu Jianhua USTC China You Sifang USTC China Young Clint SUNY Binghamton US Zhang Yan USTC China 47 incoming graduate students this year; 39 PhD candidates; 6 exchange students (MA); 2 MSI Europe US Where do new students come from? Asia

  19. Undergraduate Degrees Bachelor degrees , December 2003(3) Alisha Cramer Yoshitaka Yamagata Meng Yan May 2004 (12) Sevan Aydin Zoe Berger Law school Stuart Fishkin seeking jobs Philip Grandin Vanderbilt planetarium; grad school ‘05 Taiga Inoue (PHY minor) graduate school, systems science Jason Pawlowski graduate study, physics - Colorado Amy Roberts BNL research

  20. Undergraduate Degrees Jude Schneck graduate school, chemistry - Boston University Ki Wi Song (PHY minor) Anthony Traglia undecided; graduate school in future Chui Yi Woo graduate school, physics - Duke Adi Zolotov research at Stony Brook; graduate school August 2004 (4) Eirini Anastasiou Pharmaceutical industry/ medical school Spiro Kartsonis industry James Scholtz undecided Sebastian Trujillo research at Stony Brook; graduate school

  21. Enrollments last yr. this yr. AST101 141 161 AST105 262 266 AST248 230 225 PHY113 50 50 New “Physics of Sport” -- market seems >100 PHY121 351 426 PHY122 133 150 PHY131 302 270 PHY132 91 59 PHY125 87 98 PHY126 81 PHY301 44 31 PHY303 42 28 Introductory course enrollments continue high. Junior level courses down somewhat but still larger than we’ve seen in the past. We continue to need to improve in finding opportunities for research projects for undergraduates, and the increased number of majors amplifies this need.

  22. 2004 Teacher of the year Emilio Mendez

  23. The great softball challenge In a warm up for the Olympic games on August 19, the graduate student Team Tiger took on the dream team, Godzilla made up of faculty, staff (and a few ringers). Final score:Team Godzilla21(base 4) : Team Tiger20(base 8) Age and treachery will always overcome youth and enthusiasm! Better luck next year to the grad students!

  24. Simons Lecturers The bequest by the Simons Foundation will be used this year to sponsor two special lecturers who will visit the department for a week or more and give a combination of colloquium and seminar level talks. The lecturers will also be available for discussions and interactions with students and faculty. Lecturers were chosen to present recent theoretical advances of physics and astronomy, and to represent theoretical fields not strongly represented at Stony Brook. Paul Steinhardt of Princeton University will talk on alternatives to big bang cosmology and quasi-crystals during his visit from Oct. 25 – 29. (Host: Bill Weisberger) Sir Michael Berry of the University of Bristol will discuss optical singularities, chaos and Riemann zeroes, non-hermitian degeneracies and asymptotic oscillatory phenomena. He will visit Jan. 31 – Feb. 11 (Host: Hal Metcalf)

  25. Alumni News Li Hua Yu (PhD with C.N. Yang in 1984) of Brookhaven Lab received the 2003 Free Electron Laser prize. Abid Patwa (PhD 2002 with M. Rijssenbeek) got the DØ Forward Preshower Module installed in a Museum of Modern Art (NY) exhibition, and subsequently at the Palais de la Decouverte in Paris. Bill Weng, BNL director of Center for Particle Accelerators (1974 PhD with Tom Kuo) named fellow of IEEE

  26. Alumni News Joo Sang Kang (PhD 1970, Ben Lee), now on the faculty at Korea University, has established the Benjamin W. Lee Memorial Fellowship, to be used in preference for graduate students from Korea. Sergei Maslov, PhD 1996 (Phil Allen) (now Adjunct Professor) won the Presidential Science and Engineering Award this year. Rajiv Kamilla (PhD 1997, Jainendra Jain), now at Goldman Sachs in NY, won a $10,000 prize for innovation in futures trading – and donated it to the Department! (upcoming colloquium) Mohsen Yeganeh, BS summa cum laude in ~1987, is now at Exxon Mobil Laboratories. He is a candidate for the Forum of Industrial and Applied Physics Sec’y/Treasurer position in the APS.

  27. Events On Oct. 1 at 5PM (Wang Center) Carolyn Porco, Stony Brook BS in 1974 and now Cassini imaging team leader at the Space Science Institute in Boulder, CO will give a Provost’s Lecture describing the recent studies of Saturn and its moons and rings. This lecture is part of the Alumni Homecoming Weekend activities.

  28. Colloquium Sept. 21 Jin Wang, Department of Chemistry and new affiliated member of Physics and Astronomy: “Biomolecular Folding and Recognition-Energy Landscape Perspectives” Carolyn Porco: Special Physics, Astronomy, Geosciences Colloquium on THURSDAY, Sept. 30 “The Rings of Saturn as Seen by Cassini”, Harriman Hall 137. Attending colloquium – Physics and Astronomy is a collection of special research areas that are all connected in deep and interesting ways. The weekly colloquium is our opportunity to learn about the richness of physics and to expand our horizons. It is our responsibility to join in this central activity of the Department.

  29. Outreach The popular Open Night Friday night series for the general public continues.Deane PetersonandTom Hemmickare planning a star-studded roster for 2003 – 2004.Friday nights at 7:30 PM (ESS 001) Astronomy Open Nights Fall 2003: This is the 21st year anniversary of Astronomy Open Nights Jim Lattimer“What is a neutron star made of” (Sept. 3) Fred Walter: “SMARTS: Big science with small telescopes” (Oct. 1) Phil Solomon: “The Spitzer telescope: a new look at the infrared universe” (Oct. 29) … and more Astronomy Open Nights Astronomy Open Night Worlds of Physics Fall 2003 Abhay Deshpande: Nucleon spin: from crisis to a puzzle (Sept. 10) Laszlo Mihaly: Spin resonance and spin echo (Oct. 8) … and more Also ‘Geology Open Nights and The Living World series. Worlds of Physics

  30. Outreach 2005 is the ‘Year of Physics’, commemorating the 1905 Einstein publications of Brownian motion, special relativity and photoelectric effect. Outreach, interactions with schools, special events. We and our students should be involved.

  31. The building PHYSICS AND MATH BUILDING MASONRY REPAIR STATUS: Masonry probes were performed in 2003 to determine the condition of the masonry facade, corner soldier brick courses, masonry column enclosures, and relieving angle structures by all the windows. Scope of Work for the masonry repairs are defined. Budgetary Cost estimates for masonry repair and new roof were completed: $1.86M We are at the top of the list -- Hoping for the NY State budget to pass! Over the past year, many repairs made to the AC systems on the roof – new catchment trays for condensate water, redo plumbing. So far, the most awful leaks seem to be gone!

  32. Research highlights of the past year This year I asked for one slide that represents the work of each of the research groupings. Thus this summary is NOT complete, but I hope that it gives the students a flavor for the research opportunities that the Department offers. Organizing principle for areas is from smallest to largest. The physics mistakes in presenting these are mine!! Phys/Astro merger Physical Sciences and Math research expenditures ~ $13.3M in AY’03 (14th in the nation); highest in the university

  33. Twistor superstrings(Nair; Witten; Roiban, Spradlin, & Volovich; Berkovits; Vafa; ...) W. Siegel • Old idea (1988), recently revived and extended (December, 2003) • New string theories, for just 4 dimensions • Actually describe particles, not strings • Tailored to describe Quantum Chromodynamics (as part of maximally supersymmetric Yang-Mills) • Directly give known simple results for tree graphs (Born approximation scattering) • Much simpler than Feynman diagrams; possible replacement • Use topology, twistors, superspace, worldsheet instantons • May generalize to new kinds of QCD strings • Work by Stony Brook people: Roiban (former student); Berkovits (former postdoc); Siegel (faculty); Giombi, Ricci, Robles-Llana, Trancanelli (students) • One of the topics at the Simons Workshop here, “Superstrings & Topological Strings”, July 26 - August 27, 2004 Stringy ideas are now influencing understanding of phenomena observed in the lab; may lead to ability to calculate complex higher order supersymmetry processes at LHC.

  34. Concha Gonzalez-Garcia

  35. Nucleon Decay and Neutrino Group No Oscillations Normalized to the number of entries Best Fit Super-Kamiokande, K2K, T2K, and UNO C.K. Jung, C. McGrew, C. Yanagisawa, A. Sarrat, K. Kobayashi, T. Kato, D. Kerr, R. Terri, L. Whitehead, L.P. Trung K2K Confirmation of Neutrino Oscillation Topics: Neutrino Mass and Mixing, Solar Neutrinos, Supernova Neutrinos, Atmospheric Neutrinos, Experimental Tests of Grand Unification, Proton Decay, Accelerator and Non-Accelerator based High Energy Particle Physics, Neutrino Cross Section Measurements K2K Allowed Region Exclude Null Osc. by 3.9σ • NSKobs=108 • NSKexp (best fit)=104.8 • N(no oscillation) ~ 150 Evidence for Neutrino Mass not in Standard Model

  36. Experimental high energy physics at accelerators Sr. staff: Rod Engelmann, Paul Grannis, John Hobbs, Mike Marx, Bob McCarthy, Michael Rijssenbeek, Dean Schamberger Marian Zdrazil's Thesis Search for doubly charged Higgs Bosons H++or H-- Look for decays into like sign dimuons Expected in some models extending the Standard Model. New limit on the mass m(H++) > 119 GeV To be published in PRL soon 1stDØ publication from upgraded detector

  37. Experiments at RHIC #overlapped nucleons In central collisions the particle production associated with both mesons and baryons in Au Au is similar and significantly higher than observed in pp and dAu collisions. This suggests that baryons are produced in jets, rather than by recombination of thermal quarks. Particles near trigger fragmentation A. Sickles, B. Jacak Run-3 submitted to PRL Study p0production asymmetry (ALL) from two polarized protons. This asymmetry is sensitive to the fraction of the proton spin carried by gluons. First publication (A.Deshpande et al.) established the technique and the polarization measurement. The result is consistent with DIS measurement of gluon contribution to proton spin. Run 5 will refine the measurement and help unravel the proton “spin crisis”

  38. Nuclear Theory Group Ismail Zahed Newly discovered chiral partners of charm-strange mesons by experiments at SLAC, Cornell, KEK (Japan) and Fermilab Predicted by Nowak, Rho, Zahed (1993) Bardeen, Hill (1994) temperature Boundaries for decomposing various quark systems QCD Phase Diagram of the Strongly Coupled Quark Gluon Plasma as currently probed At RHIC Shuryak and Zahed (2003) Brown, Shuryak (2004) Adiabatic trajectories of experiments Normal hadronic phase Cold superconducting phase density

  39. Gamma Ray Spectroscopy Group jn jn jp long long short R Int Int R Proton-neutron asymmetric structure Stony CUBE Scissors Mode (Mixed-Symmetry States) N. Pietralla, G. Rainovski, C. Vaman, T. Koike, A. Costin, T. Ahn, K. Dusling, T.-C. Lu Chiral doublet bands

  40. COLLIMATING ATOMS WITH THE BICHROMATIC FORCE FOCUSING ATOMS WITH A DC ELECTRIC FIELD Why the bichromatic force ??? Why electrostatic forces ??? Note – even though these look similar, they are indeed very different images. It’s HUGE, and it spans a HUGE velocity range!!! This is a new domain for atom optics andcontrol. Electrostatic forces act on neutral atoms ONLY through an induced dipole moment, a process efficient ONLY in Rydberg atoms. Here the Rydberg states (high n) have been produced by a novel process and focused to a small spot. (Thesis of Oleg Kritsun). The bichromatic force offers a new domain of optical forces to exploit for control of atomic motion. Here it collimates a metastable He beam to high intensity and brightness for use in atomic lithography. (Thesis of Matt Partlow).

  41. Condensed matter theory P. B. Allen, A. G. Abanov, R. Requist, cond-mat/031104 Spontaneous Quantum Electrical Dipole Predicted in Triangular Molecules

  42. self-assembled molecular devices interface pin gold nanowire levels (nanoimprint) CMOS wiring and plugs CMOS stack MOSFET Si wafer Nanodevice physics A collaboration including Phil Allen,Kostya Likharev and Jim Lukens, as well as experts from several other SBU departments (Chemistry, Material Sciences, and Neurobiology & Behavior) and ORNL, develops scientific basis for future hybrid semiconductor/molecular (“CMOL”) integrated circuits. CMOL circuit concept The work includes self-assembly of single-molecule devices on pre-fabricated metallic nanowires, experimental and theoretical study of electron transport in these devices, and development of novel bio-inspired architectures for CMOL circuits. A molecular single-electron transistor… ...and its I-V curve 5 nm gap gold electrodes

  43. Large Charge Quanta in Supercond/Semicond/SupercondJunctions F. Camino, V. Kuznetsov, and E. E. Mendez (F. E. Camino et. al., cond-mat/0406650) Dependence of noise on current, measured at 1.2 K. The thick solid line is the experimental curve. The dashed line is the calculated noise assuming a charge equal to e, while the thin solid line considers a charge q » 6e. Sketch of the semiconductor/superconductor structure used in this work. Electron Cooper pairs are transferred from one Nb electrode to another via a two-dimensional electron gas formed in the InAs semiconducting layer.

  44. Chris Jacobsen Spectra reveal organic functional groups Scanning microscopy at BNL: cluster analysis of Clostridium sp. forming a spore (bacterium can reduce U in soils, decreasing mobility). With J. Gillow, A.J. Francis, BNL. Center for Environmental Molecular Sciences Nanofabrication of diffractive optics X-ray optics group • H. Fleckenstein, B. Hornberger, X. Huang, C. Jacobsen, B. Larson, M. Lerotić, E. Lima, M. Lu, H. Miao, D. Sayre, D. Shapiro, S. Wirick • Departures: J. Kirz as Acting Director of Advanced Light Source, Berkeley; T. Beetz to postdoc at BNL (May 2003 photo) Lensless imaging of yeast at LBL: image reconstructed from diffraction data alone. This sample freeze-dried; now working with frozen hydrated cells. With A. Niemann, Stony Brook; P. Thibault, V. Elser, Cornell.

  45. Observational astronomy: Aaron Evans, Ken Lanzetta, Deane Peterson, Mike Simon, Phil Solomon, Fred Walte Use telescopes in Chile, Hawaii, Owens Valley, Vancouver(!) and elsewhere From the 2MASS (2 mm All Sky Survey) list of 100 largest galaxies in the near infrared. Work of Aaron Evans in collaboration with CalTech, Univ. Massachusetts.

  46. Research outside the Department • Many of our students find good thesis research beyond the Department • Accelerator physics: our adjunct professors Peggs, Ben-Zvi, Litvinenko, MacKay at BNL offer many theoretical and experimental topics. (Note the Accel. Phys course this fall by Waldo MacKay) • Atmospheric physics: the physics of our atmosphere through the Marine Sciences Research Center (Geller, de Zafra) • Biological Physics: Opportunities in genomics, brain design, bio computation at Cold Spring Harbor Lab (Chklovskii, Zhang); on campus topics in biophysics, structural biology, protein folding, radiation oncology, pharmacology (Kisker, Liang, McLaughlin, S. Smith, J. Wang) • Condensed Matter and Materials Science at BNL: (Abbamonte, Chaudhari, Davenport, Dierker, P. Johnson, Kao, Ku, Liang, Mazlov, Tsvelik) – both theory and experiment. • Particle theory and Lattice Gauge: BNL adjuncts Creutz and Dawson also opportunities in chemical physics, medical imaging etc. About 20 students supervised in these external areas.

  47. A wealth of exciting physics and astronomy has emerged your work over the past year. I have only scratched the surface (more reports to come in colloquia, seminars, Friday presentations) • The students, research associates and faculty at Stony Brook are recognized as being at the leading edge in many of the most important areas of science. • We welcome the new students to our community, and wish you every success in the exciting enterprises to come. Reception outside the Department Office (in the keg circle) follows ! This talk: