金哥占卜者
发表于 2025-3-23 13:38:35
Book 2018 book compiles the results of its author and also reviews other work in the field. In particular, the following popular questions are addressed: .Is causality protected by quantum divergence at the relevant Cauchy horizon? .How much "exotic matter" would it take to create a time machine or a warp dr
Exonerate
发表于 2025-3-23 14:40:43
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使满足
发表于 2025-3-23 21:23:55
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繁重
发表于 2025-3-23 22:34:42
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失望昨天
发表于 2025-3-24 05:07:50
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打火石
发表于 2025-3-24 06:42:15
Frosso S. Makri,Zaharias M. Psillakisrespondingly, we start the book with a brief introduction to that discipline. In the first four sections of this chapter some basic notions—such as convexity, causal simplicity and global hyperbolicity—are defined and some basic facts about them are provided, such as Whitehead’s and Geroch’s theorem
合唱队
发表于 2025-3-24 11:49:34
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TAP
发表于 2025-3-24 17:22:21
https://doi.org/10.1007/978-1-4614-8033-4at we plan an expedition to Deneb. The distance . from the Sun to Deneb, determined from the parallax, is about .ly. So, a pessimist could think that the expedition, if it is scheduled to start in .CE, will reach the destination no sooner than in .CE and its report will be received on the Earth no s
constellation
发表于 2025-3-24 21:42:58
Adrian Preda,Robert Bota,Philip Harveyradoxes seem to be something inherent to time machines (their main attribute, perhaps). On the other hand, the (supposed) paradoxicalness of time travel is traditionally the main objection against it and a good pretext for dismissing causality violating spacetimes from consideration. Recall, however
atopic
发表于 2025-3-25 01:06:52
Michael S. Ritsner,Paul H. Lysaker As a next step, it is natural to find out whether among such spaces there are solutions of the Einstein equations with realistic matter sources. In general, any . property of matter filling these spacetimes would be of interest. The only such property found so far is that the geometries under consi