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The question (v2) that was closed as non-mainstream read: Title: How would a tachyonic antitelephone work? [...] So here's my question. Let's say that in the year 2067, a highly advanced alien race d …

Merging two posts is often a quite delicate and time-consuming job. E.g. even two questions, which are essentially duplicates of each others, can be worded slightly different, and the merged answers m …

Asking for close-reasons in comments is of course totally fine. And moderators and other Phys.SE users try to leave comments whenever the standard close-reason banner is insufficient. But do keep in …

It seems that OP's question (v3) is a valid mainstream conceptional question concerning the thermodynamical arrow of time in the same category as, say, inquiries about the Boltzmann H-theorem and Losc …

General comments: When it comes to non-mainstream topics, such as, e.g., faster-than-light travel, tachyons, time travel, warp-drive, wormholes, antigravity, multiverses, parallel universes, pre-big- …

This post seems like a list question is a standard comment that I have been using in lack of better to bring attention when a question has no unique answer, and fits poorly into the SE Q&A format in i …

It seems that this is a case where the close reason text from the SE engine is currently unreasonable, which possibly should be addressed on the SE mother meta site. E.g. it often happens that a user …

A question of the form What is the biggest X? presumably means that an answerer should only answer if they are 100% sure that they know the unique answer (which btw may change in the future), and all …

General comments (not addressing OP's specific question): Questions on negative effective mass are on-topic. Questions on particles with imaginary mass (tachyons) and/or negative mass are non-mainst …

Briefly speaking, asking about faster-than-light tachyonic particles is non-mainstream/primarily opinion-based and usually$^1$ off-topic (unless it's about experimental searches), while asking about t …

In the concrete case, it indeed seems to be a conceptional question rather than a typical HW-like question where the HW tag applies. That said, in general, whether a question is HW-like or on-topic is …

In general, tags are very useful tool in searching the site. Whether a question is on-topic or off-topic is determined by the Phys.SE community (partly via close & reopen votes), and its conclusion sh …

Speaking in general, the existence/non-existence of a tag does not imply that a certain question is on-topic/off-topic, respectively. This is instead decided by the Phys.SE community, e.g. via vote-to …