Welcome to the NASA Breakthrough Propulsion Physics (BPP) Project Public Information Site. ABOUT BPP: NASA supported the Breakthrough Propulsion Physics Project from 1996–2002 to seek the ultimate breakthroughs in space transportation: (1) propulsion that requires no propellant mass, (2) propulsion that attains the maximum transit speeds physically possible, and (3) breakthrough methods of energy production to power such devices. Topics of interest include experiments and theories regarding the coupling of gravity and electromagnetism, the quantum vacuum, hyper-fast travel, and superluminal quantum effects. Because the propulsion goals are presumably far from fruition, a special emphasis is to identify affordable, near-term, and credible research that could make measurable progress toward these propulsion goals. The Project was managed by Marc Millis of the Glenn Research Center (GRC), and sponsored by the Advanced Space Transportation Program (ASTP) managed by NASA Marshall Space Flight Center (MSFC). In Summer 2002, funding under the ASTP was discontinued. Key Journal Publications: - Millis, M.G., 'NASA Breakthrough Propulsion Physics Program', Acta Astronautica 44 (1999), pp. 175-182. - Millis, M.G., 'Challenge to Create the Space Drive', AIAA Journal of Propulsion and Power 13 (1997), pp. 577-582. - Maclay, G.J., 'Analysis of zero-point electromagnetic energy and Casimir forces in conducting rectangular cavities', Physical Review A 61 (2000), 052110. - Mojahedi, M., Schamiloglu, Hegeler, and Malloy, 'Time-domain detection of superluminal group velocity for single microwave pulses', Physical Review E 62 (2000), pp. 5758-5766. - Segev, B., Milonni, Babb, and Chiao, 'Quantum noise and superluminal propagation', Physical Review A 62 (2000), 0022114. - Milonni, P.W. and Maclay, 'Quantized-Field Description of Light in Negative-Index Media', Optics Communications 228 (2003), pp. 161-165. - Maclay, J. and Forward, R., 'A Gedanken spacecraft that operates using the quantum vacuum (adiabatic Casimir effect)', Foundations of Physics 34 (2004), pp. 477-500. - NASA TM-2004-213082: 'Prospects for Breakthrough Propulsion from Physics' (Millis, 2004). Proposals and papers submitted to BPP were evaluated against rigorous Credibility Screening Criteria to balance visionary ambition with scientific rigor: 1. Based on Credible References: Grounded in peer-reviewed literature and recognized journals. 2. Leading Toward a Discriminating Test: Proposing definitive empirical tests that differentiate hypotheses from conventional explanations. 3. Overall Credibility: Sound methodology, error analysis, mathematical consistency, and reproducible physics. Criteria Map Across Paper Types: - Benefit Analysis: Must summarize maturity and calculate quantitative, numeric bounds rather than hand-waving. - Advancement of Published Theories: Must advance toward a discriminating empirical test. - New Theories: Must cite peer-reviewed phenomenon data and compare directly against existing models. - Anomalous Effects: Must focus on experimental isolation, elimination of spurious artifacts, and testable predictions. Task 1: An Experimental Test of a Dynamic Mach's Principle Prediction (PI: John G. Cramer, Univ. of Washington). Independent test of Woodward's transient mass fluctuation effect using a driven mechanical oscillator. Task 2: The Use of Surfaces in Systems to Exploit Quantum Vacuum Energy (PI: Jordan Maclay, Quantum Fields LLC; MEMS Optical). Investigating Casimir forces in microcavities and potential QED repulsive forces. Task 3: Search for Effects of an Electrostatic Potential on Clocks in the Frame of Reference of a Charged Particle (PI: Harry I. Ringermacher, Kronotran LLC; Washington Univ.). High-precision NMR tests searching for electrostatic-potential clock shifts based on non-Riemannian torsion theory. Task 4: Exploration of Gravity Modification by Josephson Junction Effects in Magnetized High-Tc Superconducting Oxides (PI: Glen A. Robertson and Ron R. Litchford, NASA MSFC). Testing claims of anomalous gravitational effects using RF-modulated YBCO superconductors. Task 5: Detection of Superluminal Propagation at Low or Near Resonance Frequencies (PI: Kevin Y. Malloy, M. Mojahedi, R. Chiao, Univ. of New Mexico/UC Berkeley). Measuring group velocity in 1D photonic crystals while verifying that front velocity strictly obeys Einstein causality. Authors: John G. Cramer, Damon P. Cassissi, Curran W. Fey (University of Washington). Abstract: James F. Woodward predicted transient mass fluctuations in charging capacitors based on a Machian gravitational interaction term proportional to 1/G. To test this without relying on reactionless forces that violate Newton's 3rd law, this experiment couples the capacitor to a high-Q mechanical harmonic oscillator ('Mach Guitar') driven at resonance. Sizable mass variations would produce detectable constant phase shifts in oscillator motion with high signal integration precision. Authors: Jordan Maclay, Jay Hammer, Michael A. George, Lelon Sanderson, Rob Ilic, Quinn Leonard, Rod Clark. Abstract: QED calculations indicate that boundary geometries (such as rectangular cavities) can theoretically give rise to repulsive Casimir forces. The experiment utilizes an Atomic Force Microscope (AFM) with a 200 µm metallized sphere positioned over an array of sub-micron gold microcavities in high vacuum to detect potential repulsive forces. Authors: Harry I. Ringermacher, Mark S. Conradi, Caleb D. Browning, Brice N. Cassenti. Abstract: Experiments tested whether intense electric potentials alter the clock rate of charged particles (proton nuclear magnetic resonance in benzene). Results showed null frequency shifts to 6x10^-9 resolution, establishing that work and potential energy changes, rather than raw electrostatic potential, govern clock rates, leading to the formulation of the 'Clock Principle' and ruling out classical negative rest mass. Authors: Glen A. Robertson, Ron Litchford, Bryan Thompson, Randall Peters. Abstract: A Cavendish torsion balance was adapted to measure potential anomalous forces from YBCO superconductors under RF/EM modulation in liquid nitrogen. Results showed inconclusive upward drifts primarily caused by thermal and RF interference, while subsequent independent experiments by Hathaway et al. (2003) conclusively showed null gravitational effects. Authors: Mohammad Mojahedi, Kevin J. Malloy, Raymond Chiao. Abstract: Microwave pulse tunneling experiments in 1D photonic crystals exhibited superluminal group velocities (2.38 ± 0.15 c) and negative group delays. However, detailed theoretical and mathematical analysis confirms that the Sommerfeld forerunner ('front velocity') remains strictly luminal (c), proving full compliance with Einstein causality and special relativity. Official NASA solicitation and management structure establishing the BPP program. It defines Scientific Readiness Levels (SM-0 Pre-science through SM-4 Hypothesis Tested/TRL-1), prioritizing empirical testing of critical make-or-break issues, cost and schedule realism, and peer-reviewed deliverables. It details the governance model under NASA Glenn and MSFC ASTP. Author: Marc G. Millis (NASA GRC). Comprehensive summary of 16 research tasks across the project and external efforts: 6 tasks found non-viable (e.g., Podkletnov gravity shielding, Schlicher thruster, Biefeld-Brown ion wind effects), 4 tasks showing clear opportunities for sequels (Casimir vacuum force manipulation, negative index media, advanced QED cavity physics), and 6 remaining unresolved. Analysis of commonly submitted propulsion concepts by amateur researchers: - Oscillation Thrusters ('Sticktion' / Dean Drives): Fail due to internal friction imbalances; net momentum is zero in free space (pendulum test failure). - Gyroscopic Antigravity (e.g., Laithwaite demonstrations): Precession torque misidentified as lift; cannot alter linear momentum without external mass interaction. - Electrostatic Antigravity ('Lifters' / Biefeld-Brown): Rigorous vacuum tests confirm thrust is solely due to atmospheric ion wind / corona discharge. Taxonomy of seven hypothetical space drive concepts designed to explore physical boundary conditions: 1. Diametric Drive: Acceleration via asymmetric gravitational potential gradient created by paired positive and negative mass. 2. Pitch Drive: Inducing a localized slope in scalar gravitational potential without point sources. 3. Bias Drive: Locally altering the gravitational constant G or space metric properties. 4. Disjunction Drive: Decoupling source mass from reactant mass. 5. Induction / Collision Sails: Asymmetric reflection or absorption of isotropic vacuum electromagnetic fluctuations (ZPF).