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They are both about "effective mass", as can be seen in the first bullet of your screenshot already.

Actual negative mass is just a hypothetical idea at the moment and has never been observed. No matter how Thomas tries to embellish the story, for obvious reasons, it's quite clear that the vast majority of experts regard its existence highly unlikely, and even if it existed, it may not actually work for space travel.

Tajmar makes it clear how Zeilinger obtained just negative effective mass here:

http://www.ifi.unicamp.br/~assis/J-Advanced-Phys-V4-p77-82(2015).pdf

Those don't really make actual negative masses any more likely, as is already evident from the news articles about those findings, including that you linked from NewScientist:

Light can break Newton’s third law – by cheating

https://www.fau.eu/2013/10/22/news/research/the-negative-mass-effect/

Researchers break Newton's third law - with lasers - ExtremeTech

<blockquote data-quote="Realm" data-source="post: 268496" data-attributes="member: 9250">They are both about &quot;effective mass&quot;, as can be seen in the first bullet of your screenshot already.Actual negative mass is just a hypothetical idea at the moment and has never been observed. No matter how Thomas tries to embellish the story, for obvious reasons, it&#039;s quite clear that the vast majority of experts regard its existence highly unlikely, and even if it existed, it may not actually work for space travel.Tajmar makes it clear how Zeilinger obtained just negative effective mass here:<a href="http://www.ifi.unicamp.br/~assis/J-Advanced-Phys-V4-p77-82(2015).pdf" target="_blank">http://www.ifi.unicamp.br/~assis/J-Advanced-Phys-V4-p77-82(2015).pdf</a>Those don&#039;t really make actual negative masses any more likely, as is already evident from the news articles about those findings, including that you linked from NewScientist:<a href="https://www.newscientist.com/article/dn24411-light-can-break-newtons-third-law-by-cheating/" target="_blank">Light can break Newton’s third law – by cheating</a><a href="https://www.fau.eu/2013/10/22/news/research/the-negative-mass-effect/" target="_blank">https://www.fau.eu/2013/10/22/news/research/the-negative-mass-effect/</a><a href="https://www.extremetech.com/extreme/168771-researchers-seemingly-break-newtons-third-law-create-optical-diametric-drive" target="_blank">Researchers break Newton&#039;s third law - with lasers - ExtremeTech</a></blockquote>

[QUOTE="Realm, post: 268496, member: 9250"] They are both about "effective mass", as can be seen in the first bullet of your screenshot already. Actual negative mass is just a hypothetical idea at the moment and has never been observed. No matter how Thomas tries to embellish the story, for obvious reasons, it's quite clear that the vast majority of experts regard its existence highly unlikely, and even if it existed, it may not actually work for space travel. Tajmar makes it clear how Zeilinger obtained just negative effective mass here: [URL]http://www.ifi.unicamp.br/~assis/J-Advanced-Phys-V4-p77-82(2015).pdf[/URL] Those don't really make actual negative masses any more likely, as is already evident from the news articles about those findings, including that you linked from NewScientist: [URL="https://www.newscientist.com/article/dn24411-light-can-break-newtons-third-law-by-cheating/"]Light can break Newton’s third law – by cheating[/URL] [URL]https://www.fau.eu/2013/10/22/news/research/the-negative-mass-effect/[/URL] [URL="https://www.extremetech.com/extreme/168771-researchers-seemingly-break-newtons-third-law-create-optical-diametric-drive"]Researchers break Newton's third law - with lasers - ExtremeTech[/URL] [/QUOTE]

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