S. N. Gupta introduced in 1950, simultaneously and independently of
Konrad Bleuler, the
Gupta–Bleuler quantization of the
quantum electrodynamics (QED), that takes the covariant
Lorenz gauge condition on an indefinite metric in
Hilbert space of states realized. From it came some of the first attempts, to derive the equations of
general relativity from
quantum field theory for a massless spin-2 particle (
graviton). Similar work has also led
Robert Kraichnan in the 1940s (not published until 1955) and later in the 1960s, by
Richard Feynman and
Steven Weinberg. Later he worked in various areas of
quantum field theory and elementary
particle physics, including
quantum chromodynamics and
quarkonium.
Notable works and contributions • Barua, D. & Gupta, S. N. (1977). Magnetic and quadrupole moments of the W boson.
Physical Review D,
15(2), 509. • Gupta, S. N., & Radford, S. F. (1985). Quark confinement in quantum chromodynamics.
Physical Review D,
32(3), 781. • Gupta, S. N., Radford, S. F., & Repko, W. W. (1985). (A comment on) Spin-dependent forces in heavy-quark systems.
Physical Review Letters,
55(27), 3006. • Gupta, S. N., Johnson, J. M., & Repko, W. W. (1996). Relativistic two-photon and two-gluon decay rates of heavy quarkonia.
Physical Review D,
54(3), 2075. • Gupta, S. N., Johnson, J. M., Ladinsky, G. A., & Repko, W. W. (1996). Gauge-boson scattering signals at the CERN LHC.
Physical Review D,
53(9), 4897. ==Personal life and death==