The bottom line is that we now have the prospect of an FTL space drive that is embedded in general relativity and that can be made without the need for negative mass-energy. Watch this column for future progress in the theory and observation of Lentz solitons.
John G. Cramer's 2016 nonfiction book (Amazon gives it 5 stars) describing his transactional interpretation of quantum mechanics, The Quantum Handshake - Entanglement, Nonlocality, and Transactions, (Springer, January-2016) is available online as a hardcover or eBook at: http://www.springer.com/gp/book/9783319246406 or https://www.amazon.com/dp/3319246402.
SF Novels by John Cramer: Printed editions of John's hard SF novels Twistor and Einstein's Bridge are available from Amazon at https://www.amazon.com/Twistor-John-Cramer/dp/048680450X and https://www.amazon.com/EINSTEINS-BRIDGE-H-John-Cramer/dp/0380975106 . His new novel, Fermi's Question may be coming soon.
Alternate View Columns Online: Electronic reprints of 212 or more "The Alternate View" columns by John G. Cramer published in Analog between 1984 and the present are currently available online at: http://www.npl.washington.edu/av .
Miguel Alcubierre, " The warp drive: hyper-fast travel within general relativity", Classical and Quantum Gravity 11 L73-L77 (1994): arXiv: gr-qc/0009013.
"Breaking the Warp Barrier: Hyper-Fast Solitons in Einstein-Maxwell Plasma Theory", Erik W. Lentz, June 15, 2020; arXiv:1910.03887 [hep-ex].
ADM Version of General Relativity:
R. Arnowitt, S. Deser, and C. Misner, "Dynamical Structure and Definition of Energy in General Relativity", Physical Review 116 1322–1330 (1959).