most recent 30 from physics.meta.stackexchange.com 2025-08-07T12:59:24Z https://physics.meta.stackexchange.com/feeds/question/14874 https://creativecommons.org/licenses/by-sa/4.0/rdf https://physics.meta.stackexchange.com/q/14874 -1 Anixx https://physics.meta.stackexchange.com/users/1186 2025-08-07T16:29:27Z 2025-08-07T03:07:34Z

<p>This <a href="https://physics.stackexchange.com/q/840559">question of mine</a> was closed as being &quot;not about mainstream physics&quot;.</p> <p>But the question is simply about how the mechanical equations would work if one of the physical quantities (mass) has reserved sign.</p> <p>Matter with negative mass is known as exotic matter, and is needed in other hypothetical transportation devices as well, such as Alcubierre drive or wormholes. Is this also considered non-mainstream?</p> <p>Are the questions about any hypothetical particles (such as magnetic monopoles) or matter considered off-topic?</p> <p>For the reference, &quot;exotic matter&quot; is found 612 times on Arxiv: <a href="https://arxiv.org/search/?query=%22exotic+matter%22&amp;searchtype=all&amp;abstracts=show&amp;order=-announced_date_first&amp;size=50" rel="nofollow noreferrer">https://arxiv.org/search/?query=%22exotic+matter%22&amp;searchtype=all&amp;abstracts=show&amp;order=-announced_date_first&amp;size=50</a></p> <p>&quot;Negative mass&quot; is found 498 times: <a href="https://arxiv.org/search/?query=%22negative+mass%22&amp;searchtype=all&amp;abstracts=show&amp;order=-announced_date_first&amp;size=50" rel="nofollow noreferrer">https://arxiv.org/search/?query=%22negative+mass%22&amp;searchtype=all&amp;abstracts=show&amp;order=-announced_date_first&amp;size=50</a></p> <p>Published articles regarding hypothetical diametric drive:</p> <hr /> <p>Unveiling the Link between Airy-Like Self-Acceleration and Diametric Drive Acceleration</p> <p>August 2021 Physical Review Letters 127(8)</p> <p>DOI:10.1103/PhysRevLett.127.083901</p> <p><a href="https://www.researchgate.net/publication/353969117_Unveiling_the_Link_between_Airy-Like_Self-Acceleration_and_Diametric_Drive_Acceleration" rel="nofollow noreferrer">https://www.researchgate.net/publication/353969117_Unveiling_the_Link_between_Airy-Like_Self-Acceleration_and_Diametric_Drive_Acceleration</a></p> <hr /> <p>Spontaneous diametric-drive acceleration initiated by a single beam in a photonic lattice</p> <p>Optica Publishing Group Optics Letters</p> <p>June 2020 45(11)</p> <p>DOI:10.1364/OL.394838</p> <hr /> <p>Optical diametric drive acceleration via action-reaction symmetry breaking</p> <p>October 2013 Nature Physics 9(12)</p> <p>DOI:10.1038/nphys2777</p> <p><a href="https://www.researchgate.net/publication/257958489_Optical_diametric_drive_acceleration_via_action-reaction_symmetry_breaking" rel="nofollow noreferrer">https://www.researchgate.net/publication/257958489_Optical_diametric_drive_acceleration_via_action-reaction_symmetry_breaking</a></p> <hr /> <p>Observation of spatial optical diametric drive acceleration in photonic lattices</p> <p>Optica Publishing Group Optics Letters</p> <p>December 201743(1):118</p> <p>DOI:10.1364/OL.43.000118</p> <p><a href="https://www.researchgate.net/publication/322009622_Observation_of_spatial_optical_diametric_drive_acceleration_in_photonic_lattices" rel="nofollow noreferrer">https://www.researchgate.net/publication/322009622_Observation_of_spatial_optical_diametric_drive_acceleration_in_photonic_lattices</a></p> <hr /> <p>Moreover, negative mass is expected to be obtained in quantum energy teleportation process.</p> <p>If this is off-topic here, then where should it be asked? On math?</p>

https://physics.meta.stackexchange.com/questions/14874/-/14875#14875 7 ZeroTheHero https://physics.meta.stackexchange.com/users/36194 2025-08-07T17:39:19Z 2025-08-07T17:39:19Z

<ol> <li>It is difficult to believe that a question about a hypothetical drive can be mainstream.</li> <li>&quot;Assuming the matter with negative mass&quot; -- which we have never seen -- &quot;would have both negative gravitational and inertial properties&quot;: why would we assume this?</li> <li>&quot;other hypothetical transportation devices as well, such as Alcubierre drive or wormholes. Is this also considered non-mainstream?&quot; Yes.</li> <li>You ask 3 questions, so it lacks focus.</li> <li>Finally, finding isolated references to a diametric drive does not make the topic mainstream: it makes it anecdotal. I'm sure one can find dozens of papers on flat Earth, or on why QED is a conspiracy.</li> </ol> <p>You can do serious work on non-mainstream topics (presumably within some assumptions), but this is not the place to discuss such work.</p> <p>(For clarity: I was not involved in the closure.)</p>

https://physics.meta.stackexchange.com/questions/14874/-/14876#14876 4 controlgroup https://physics.meta.stackexchange.com/users/391067 2025-08-07T21:02:25Z 2025-08-07T21:02:25Z

<blockquote> <p>The question is simply about how the [mechanical] equations would work if one of the [physical] quantities (mass) has reserved sign.</p> </blockquote> <p>Things can't properly have negative mass, according to physics.</p> <p>The reason this post was closed is because you're essentially asking &quot;if I drop this assumption that basically all physics makes, what does physics say will happen?&quot; which is not necessarily even reasonable to ask, let alone a question about a mainstream physics concept. There are papers that deal with negative mass, but that does not mean that you would find a Negative-Mass Mechanics 101 class at any university, or a widely-popular book that we could reference to give you a definitive answer. Other people's research doesn't count as mainstream unless that's specifically what's being looked for.</p> <blockquote> <p>Matter with negative mass is known as exotic matter, and is needed in other hypothetical transportation devices as well, such as Alcubierre drive or wormholes. Is this also considered non-mainstream?</p> </blockquote> <p>The Alcubierre drive, as a spacetime metric, is not off-topic, and there's a whole tag devoted to it. It is known that its physical construction is unphysical, so discussing <em>how to build one</em> is not mainstream physics. But asking about the geometry itself is perfectly-valid, since that geometry falls neatly into a spot in general relativity (albeit a spot that doesn't have physical correspondence in many other places).</p> <hr /> <p>All that aside, you're still asking too many questions in that post (maximum: 1).</p>

https://physics.meta.stackexchange.com/questions/14874/-/14881#14881 5 rob https://physics.meta.stackexchange.com/users/44126 2025-08-07T03:07:34Z 2025-08-07T03:07:34Z

<p>Your linked research papers (the four with Digital Object Identifiers in v3 of your question) are not about &quot;diametric drives,&quot; even though they mention the existence of the idea in general relativity. Your bibliography is about optical systems where some condensed-matter conspiracy produces <em>quasi</em>particles with negative <em>effective</em> mass (like an air bubble has in water). These electronic interactions give the materials in question nonlinear optical properties, so that intense pulses of light behave in a surprising way.</p> <p>If you have questions about how this negative-mass phenomenon behaves in the mathematics of general relativity, it's not enough to assert that a literature exists which uses some of the words in your question. Find some mainstream articles which actually discuss the topic that interests you (perhaps from the bibliographies of your optics articles). Read those. Then you might benefit from returning here and asking specific questions about the actual contents of that mainstream research.</p>

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