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False vacuum - Wikipedia, the free encyclopedia (1271 words) |
 | A false vacuum is a metastable sector of a quantum field theory which appears to be a perturbative vacuum but is unstable to instanton effects which tunnel to a lower energy state. |
| The key insight is that a false vacuum with positive potential energy density is a de Sitter vacuum, in which the potential energy acts as a cosmological constant and the universe is undergoing the exponential expansion of de Sitter space. |
| Vacuum decay is the ultimate ecological catastrophe; in the new vacuum there are new constants of nature; after vacuum decay, not only is life as we know it impossible, so is chemistry as we know it. |
| Vacuum toilet system - Patent 4063315 (7952 words) |
| Another advantage is that vacuum cleaner type outlets could be located throughout the interior of the airplane so that the vacuum power of the system could be used to clean the interior of the airplane or vacuum the rugs in a manner similar to a central vacuum cleaning system. |
| The main purpose in producing a vacuum is to be able to remove the waste matter from each of the toilet compartments and transport it through the drain lines to a central holding tank where it can be processed and simplify the servicing of the airplane. |
| In comparison with the dry matter flush tests, the decay rate in the vacuum pressure during the wet matter flush tests is much less due to the sealing of the water in the lines. |
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