Talk:Anti-gravity

Removed "Lagrangian Points"

I have removed the following paragraph from the section "Conventional effects that mimic anti-gravity effects":

• Multiple nearby gravity sources generate separate gravity fields. Thus, if an object is placed at a certain location between two sources (the so-called Lagrangian point, see picture), their gravity cancel out each other's. In this state, the object still experiences gravity, but from opposite directions with the same strength, so the resulting force is null.

It is not the gravity of the objects that cancels each other out, it is gravity *plus centrifugal forces*. The situation is very similar to a satellite staying in its orbit despite gravitation. --Lotharster --91.67.24.156 (talk) 13:11, 3 October 2008 (UTC)

Accelerating Objects Using Gravity

This is a general question to all Wikipedians: Using anti-gravity or some force of reversed gravity, would it be possible to accelerate a projectile to super speeds? I'm not talking about magnetic propulsion or anything of that sort, or a Gauss gun, but really taking an object, putting it in a chamber of some sort with Anti-Gravity or some sort of Zero-Gee space to make it reach higher speeds before going out and reacting to the Earth's gravity. You know, to make it faster. —Preceding unsigned comment added by 74.171.126.143 (talk) 03:29, 15 December 2008 (UTC)

Re: Tajmar effect tested in New Zealand

There is something amiss in what I have seen concerning this so-called testing of Tajmar's effect by the New Zealand group. For one thing, the discrepancy between the mass of Cooper pairs first measured in superconductors by Janet Tate et.al is a long-standing discrepancy. In New Scientist, 2006-11-11, Tate is quoted as saying The measurement has remained unexplained for the last 20 years. Whatever you may say about Tajmar's work, that discrepancy is still there and still remains unexplained. Moreover, at last check, the reported anomalies of the Gravity Probe B mission are also still unexplained. Thus, we still cannot rule out a gravito-magnetic effect.

Has anyone bothered to contact Tajmar directly? Because I did and this is what he tells me:

It's always the same problem that people just read abstracts only. The New Zealand group (Graham et al) tested my 2006 theory (which I already dismissed with my own experimental results) - not my experiment. They did not find any result with error bars two orders of magnitude above my signal strengths! If you read their paper they say in the last paragraph that their results can not confirm or refute my experimental claims but that they put limits on my old theoretical model.

So according to Tajmar, the New Zealand result is almost irrelevant. He also pointed me in the direction of a more recent paper (2008):

http://arxiv.org/abs/0806.2271v2

FYI, I would like to remind everyone: The astronomer William Wallace Campbell whose 1922 measurements of his observations of the Sun during a total eclipse in Australia would eventually confirm Einstein's predictions. However, before the said measurements, Campbell had made a preliminary set of measurements with inferior equipment during a solar eclipse of 1918 that did not confirm the results. He appeared at Cambridge and was about to refute Einstein's theory but Eddington had data, admittedly limited data, obtained from measurements precariously obtained during a solar eclipse in Africa that seem to confirm Einsein's bending of light.

Campbell decide to delay publication that would have refuted GRT, rather stating that yes, the Einstein theory is unsettled. In other words, Einstein's theory came very very close from being refuted before anybody invested in trying to vindicate it.

Imagine what would have happened had Campbell not been so conscientious?

Thus, I submit this section about the New Zealand group should be revised because it apparently does not really refute Tajmar's experimental findings and Tajmar has since discarded his theory. I would say the experimental result is unsettled NOT repudiated. I agree that Tajmar's experimental findings need to be vindicated and/or refuted by other groups, especially in America but this part of the web-site conveys the wrong and negative impression. Now. I could decide to be bold and make the changes myself but I would prefer not to enter a tug-of-war with the author(s) of this part of the web-site. I would like to get some feedback first But I submit that this part of the web-site conveys a premature conclusion and thus the wrong impression. —Preceding unsigned comment added by 171.71.55.135 (talk) 23:48, 18 December 2008 (UTC)

We can't really use the material directly from him, as it is unpublished.- (User) Wolfkeeper (Talk) 14:33, 25 March 2009 (UTC)

Anti-matter/gravity Question

The article states; "A longstanding question was whether or not these same equations applied to antimatter. The issue was considered solved in 1957 with the development of CPT symmetry, which demonstrated that antimatter follows the same laws of physics as "normal" matter, and therefore has positive energy content and also causes (and reacts to) gravity like normal matter." Has this been tested/verified experimentally? (David Kessler) 19:32, 12 March 2009 (UTC) —Preceding unsigned comment added by 94.169.180.52 (talk)

Does Crysis 1 feature Anti-gravity?

In the first game (Crysis) there are missions with zero gravity within alien spaceships (see: https://www.youtube.com/watch?v=6e2HjmL6B8s) and if I remember it correctly there were even frozen place outside which had a lessened force of gravity. Should it be added to the Video games section (anti-gravity seems to be implied there)? --Fixuture (talk) 18:20, 16 May 2015 (UTC)

Contrived circumstances?

Second paragraph states "Under general relativity, anti-gravity is impossible except under contrived circumstances.". While it is understandable that within the context of GR, the concept of anti-gravity doesn't make much sense, it is unclear which contrived circumstances are the exceptions.

The sentence ends with 3 references, which are textbooks [of which I've read one (GR by Wald) and half (Intro to QFT by P&S), but I don't remember that such contrived circumstances were mentioned], but without any further explanation.

It should be clarified which contrived circumstances would make anti-gravity possible. 93.142.224.42 (talk) 19:20, 23 January 2016 (UTC)

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