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Ott, R.

Publications and source records attributed to Ott, R..

4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Non-cancellation of the parity anomaly in the strong-field regime of QED 2+1

Quantum fluctuations lead to an anomalous violation of parity symmetry in quantum electrodynamics for an even number of spatial dimensions. While the leading parity-odd electric current vanishes in vacuum, we uncover a non-cancellation of the anomaly for strong electric fields with distinct macroscopic signatures. We perform real-time lattice simulations with fully dynamical gauge fields and Wilson fermions in 2 + 1 space-time dimensions. In the static field limit, relevant at early times, we solve the problem analytically. Our results point out the fundamental role of quantum anomalies for strong-field phenomena, relevant for a wide range of condensed matter and high-energy applications, but also for the next generation of gauge theory quantum simulators.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
NASA NTRS1976

The Nike-Black Brant V development program

The Nike-Black Brant V represents a combined U.S.-Canadian program to achieve a 40 percent increase in apogee performance over that of the unboosted BBV, with minimum component modification and no meaningful increase in flight environment levels. The process of achieving these objectives is described, in particular optimization of sustainer coast period and roll history, and the techniques used to ensure good stage separation. Details of the structural test program and subsequent successful vehicle proving flight are provided. Basic performance data are preented, with an indication of the further potential offered by Terrier boost.

Sevier, H.↗
NASA NTRS1975

Astronomy Spacelab payloads

Preliminary analyses of four typical Spacelab astronomy payloads have been completed. The payloads consist of instrumentation recommended by NASA and other scientists for early Shuttle missions. Design concepts have been prepared and compatibility with Shuttle and Spacelab verified. Mission parameters that meet payload requirements and efficiently utilize Shuttle resources have been selected. Integrated pointing and stabilization and command and data-handling system concepts have been developed. The results of all these activities indicate that productive astronomy missions can be carried out with Shuttle and Spacelab systems.

Ott, R.↗