Rajan Gupta

Professional Highlights

HIGHLIGHTS have been listed by the year in which the idea was first introduced or when the first work on the stated topic was published.

RESEARCH: Quantum Chromodynamics

  1. 1982: First one loop calculation of inclusive processes -- the pion form factor. (With R.D. Field, S. Otto and L. Chang)
  2. 1998: A critical analysis of the extraction of light quark masses from sum rules and Lattice QCD using axial and vector current Ward identities. (With T. Bhattacharya and K. Maltman)

RESEARCH: Lattice Quantum Chromodynamics

  1. 1982: First calculation of hadron spectrum detailing finite size corrections and proposed improved operators. Subsequently refined these calculations using both Wilson and staggered fermions. (With A. Patel)
  2. 1983: Introduced a novel blocking transformation for 4-dimensional gauge theories. First application to U(1) gauge theory. (With R. Cordery and M. Novotny)
  3. 1984: Calculated the non-perturbative beta-functions for SU(2) and SU(3) gauge theory and clarified the behavior of the phase diagram and scaling in the fundamental-adjoint plane. (with A. Patel)
  4. 1984: First calculations of weak matrix elements needed to understand CP violation in the Standard Model. Subsequently refined these calculations using both Wilson and Staggered Fermions. (With R.C. Brower, M.B. Gavela and G. Maturana)
  5. 1984: Introduced a numerical method to estimate the renormalized action produced under a blocking transformation. Carried out calculations for both SU(2) and SU(3) gauge theories. (with A. Patel)
  6. 1986: Showed that SU(3) gauge theory with four light dynamical flavors has a strong first order phase transition. (With G. Guralnik, G. Kilcup, A. Patel and S. Sharpe)
  7. 1988: Analyzed the scaling behavior of the Hybrid Monte Carlo Algorithm. (With G. Kilcup and S. Sharpe)
  8. 1989: Carried out first large scale simulations of QCD with two dynamical quark flavors. (With C. Baillie, G. Guralnik, G. Kilcup, A. Patel and S. Sharpe)
  9. 1990: First calculation of the kaon bag parameter with staggered fermions. Techniques developed by us have provided the state-of-the-art results used in QCD phenomenology since 1990. (with G. Kilcup, A. Patel, S. Sharpe)
  10. 1991: A calculation of the pion's quark distribution amplitude in lattice QCD with dynamical fermions. (With D. Daniel and D. Richards)
  11. 1991: First calculations of the glueball spectrum using improved action and operators. (With C. Baillie, G.W. Kilcup, A. Patel and S. Sharpe)
  12. 1992: Developed the formulation for calculating the pion scattering amplitude and carried out calculations for the I=2 part. (With A. Patel and S. Sharpe)
  13. 1993: Developed a novel method to estimate Bethe-Salpeter amplitudes and density correlations. (With D. Daniel and J. Grandy)
  14. 1994: Showed that matrix elements of the singlet Axial current in proton state current cannot be calculated in the quenched approximation. (With J. Mandula)
  15. 1996: First systematic analysis of light (up, down and strange) quark masses that predicted values much lower than conventionally used in phenomenology. (With T. Bhattacharya)
  16. 1998: Developed method to calculate all the improvement constants for bilinear operators using Ward identities.
  17. 1998: Calculation of the decay constant of beauty mesons using non-relativistic QCD. (With A. Ali Khan, T. Bhattacharya, S. Collins, C. Davies, C. Morni\ngstar, J. Shigemitsu, J. Sloan)
  18. 2000: Calculation of meson and baryon spectrum with beauty quarks using non-relativistic QCD. (With A. Ali Khan, T. Bhattacharya, S. Collins, C. Davies, C. Morningstar, J. Shigemitsu, J. Sloan)
  19. 2004: Demonstrated that hypercubic smeared staggered fermions have better scaling behavior and small corrections to renormalization constants. (With T. Bhattacharya, G. Fleming, G. Kilcup, W. Lee, S. Sharpe)

RESEARCH: STATISTICAL MECHANICS

  1. 1981: Introduced a numerical Hamiltonian method for calculating the mass gap in continuous spin and gauge systems. (With G.C. Fox, O. Martin and S. Otto)
  2. 1984: Developed a new method for Monte Carlo Renormalization Group calculations. (With R. Cordery)
  3. 1985: Provided numerical evidence for redundant operators in Ising models. (With R. Shankar)
  4. 1985: Explained why the truncation errors in the Monte Carlo Renormalization Group method are small. (With R. Shankar and G. Murthy)
  5. 1988,1991: Carried out state-of-the-art simulations of the 2D XY model. (With C. Baillie)
  6. 1992,1996: State-of-the-art analysis of the 3D Ising model using the Monte Carlo Renormalization Group method. (With C. Baillie and P. Tamayo)

RESEARCH: COMPUTATIONAL BIOLOGY

  1. 2000: Phylogenetic analysis of the HIV-1 virus leading to an estimate of the time of origin of the modern pandemic. (With T. Bhattacharya, F. Gao, B. Hahn, A. Lapedes, B. Korber, M. M\auldoon, J. Theiler, S. Wolensky)

RESEARCH AND ADVOCACY: PUBLIC HEALTH

  1. 1999-: Created the website ``HIV/AIDS Crisis in India'' to inform the public of the HIV/AIDS pandemic in India and social and political factors contributing to the spread.
  2. 1999-: Developed a program of health education and implemented it in schools and villages in India and in schools and public health institutions in New Mexico.
  3. 2004: Published monograph ``Risky Sex, Addictions, and Communicable Diseases in India: Implications for Health, Development and Security'' analyzing the HIV/AIDS pandemic in India. Published as Volume 9 in the series on Health and Security by Chemical and Biological Arms Control Institute, Washington D.C., September 2004.

CONTRIBUTIONS TO DEVELOPMENT OF PARALLEL COMPUTING

  1. 1981: First proposal for the ``Nearest Neighbor Concurrent Processor'' (with E. Benedictis, E. Brooks, G. C. Fox, O. Martin, S. Otto at Caltech).
  2. 1987: Harnessed the power of the Floating Points Systems T-100 parallel computer at Los Alamos to carry out state of the art simulations of statistical mechanics models. (With J. DeLapp)
  3. 1989: Lead Los Alamos's effort to acquire the largest Connection Machine CM-2, and showed it could be used efficiently to solve a wide class of problems. (With R. Brickner, N. Morse and A. White)
  4. 1988-91: PI on DOE Grand Challenges Awards (also 1992-96, 1997-2000)
  5. 1993: Demonstrated high sustained performance on the Connection Machine CM5 for QCD using a library of hand tuned modules written in assembly language. (With T. Bhattacharya)
  6. 1989- QCD codes developed by us have been used to validate and debug the hardware and software of all high performance parallel computers acquired by Los Alamos since 1989. (With T. Bhattacharya)
  7. 2002: Helped create Institutional Computing as a lab wide initiative to provide computing resources to LANL scientists. (With A. White)

CONTRIBUTIONS TO LOS ALAMOS

  1. 1999: Member, Search Committee for T-Division Leader
  2. 2000: Started the Los Alamos Strategic Studies Program that aims to develop the next generation of broad strategic thinkers on issues of national and international security.
  3. 2001-: Chair, Director's Colloquium Advisory Committee
  4. 2002-: Member, Institutional Computing committee
  5. 2003-: Leader, Advisory group on science to the Director (the A-team)
  6. 2004-: Leader, energy study group, LAGER (Los Alamos Global Energy Renaissance)

SUMMER SCHOOL AND MAJOR CONFERENCE ORGANIZATION

  1. 1994: Director, Santa Fe Workshop ``Large Scale Numerical Studies of QCD"
  2. 1997: Scientific Dierector, Les Houches Summer school ``Probing the Standard Model of Particle Interactions'', France, 1997.
  3. 1998: Director, Santa Fe Workshop ``Perturbative and Non-perturbative Aspects of the Standard Model''.
  4. 2000: Organizing committee, XVIII International Symposium ``Lattice Field Theory'',Bangalore, India.
  5. 2000: Director, West Fest ``Scaling Laws in Physics and Biology'', Santa Fe.
  6. 2002: Director, International workshop ``CONFRONTING TERRORISM - CT2002'', Los Alamos National Laboratory. (http://library.lanl.gov/ccw/ct2002/)
  7. 2005: Director, International workshop ``CONFRONTING TERRORISM - CT2005'', Los Alamos National Laboratory.
Rajan Gupta