To Achieve Faster than Light Astronautic Travel Whether Human Beings can Use Wormholes or Warp Drive Propulsion

Abstract

Many physicists have repeatedly turned to general relativity(GR) for the feasibility of faster than light astronautic travel, bypassing the difficulties caused by special relativity (SR). This article argues that this should not and need not be done. Because SR's "ban" on faster than light motion is wrong. We think that the idea of relying on GR to achieve faster than light travel is not desirable, because as a theoretical system, GR's internal logic is chaotic and causality is reversed. Einstein's equation of gravitational field (EGFE) is the most important formula in GR, but EGFE has obvious assumptions and traces of patchwork. How to get to "gravity bends spacetime"(or "spacetime bending makes gravity") is a fundamental question. The physical effect of the gravitational field is determined to be embodied by the metric tensor of Riemann space, and it is necessary to know the distribution law of the metric field. However, in the absence of actual observational knowledge, EGFE is derived by speculative reasoning. That is, physics experiments have never provided the knowledge and laws that show the geometry of gravity that only Riemann geometry can show. Therefore, the spacetime bending of GR is not a reassuringly reliable theory. Wormhole or Warp drive propulsion require extreme spacetime bending and great negative energy, which are not achievable. Therefore, we should still pay attention to basic research. For example, we can learn from the experience of breaking sonic barrier in aviation engineering to achieve supersonic flight. Existing high energy particle accelerators could be modified to look for faster than light particles, and so on. Regarding negative energy and special matter, we believe that the concept of negative energy, first proposed by P. Dirac, is only a means or tool of analysis and does not necessarily exist in fact. However, several possible ways of generating negative energy are also provided for discussion. By contrast, electromagnetic propulsion(EM drive), which is feasible for faster than light travel, is presented in this paper. In addition, this paper points out that theoretical physicists and aviation and aerospace experts think differently about the same superluminal space travel problem. In this regard, a comparison between the first half and the second half of the article will make it clear that the former pay attention to mathematical analysis; The latter believe that mathematical analysis is necessary, but more attention should be paid to the study of physical reality. In this article, the Warp drive solution may be just a joke.