Alan McDougall Posted January 27, 2014 Posted January 27, 2014 How would the force of gravity differ in an Antimatter Universe?
ajb Posted January 27, 2014 Posted January 27, 2014 (edited) All indications from the mathematical structure of general relativity suggest there would be no difference. This is due to the equivalence principal. However, I do know that people are looking for any differences in hydrogen and antihydrogen. Check out the ALPHA experiment http://alpha.web.cern.ch/ Edited January 27, 2014 by ajb
J.C.MacSwell Posted January 28, 2014 Posted January 28, 2014 All indications from the mathematical structure of general relativity suggest there would be no difference. This is due to the equivalence principal. However, I do know that people are looking for any differences in hydrogen and antihydrogen. Check out the ALPHA experiment http://alpha.web.cern.ch/ Seems like (my uninformed guess) a fair bit of antihydrogen might be required to get a meaningful result. What is the most that has been produced in one place at one time?
ajb Posted January 28, 2014 Posted January 28, 2014 What is the most that has been produced in one place at one time? I don't know. Try the link I gave for an answer.
swansont Posted January 28, 2014 Posted January 28, 2014 Seems like (my uninformed guess) a fair bit of antihydrogen might be required to get a meaningful result. What is the most that has been produced in one place at one time? I think it's on order of a few thousand atoms.
Strange Posted January 29, 2014 Posted January 29, 2014 This is not directly related to antimatter gravity (that is the ALPHA experiment) but there is some detail here about how antihydrogen is produced and manipulated: http://www.quantumdiaries.org/2014/01/28/anti-beam-me-up-scotty/
Schneibster Posted February 18, 2014 Posted February 18, 2014 My recollection is the same as swansont's, a handful of thousands of atoms. Supercooled and contained either magnetically or by some BEC effect or other. Aren't BECs coherent? I think it was a National Geographic article on BECs I read it in, IIRC. Perhaps 2006 or 2005; certainly pre-mid-2007.
Sensei Posted February 19, 2014 Posted February 19, 2014 How would the force of gravity differ in an Antimatter Universe? It would not differ. People don't understand that Antimatter is indispensable part of our Universe. Our atmosphere is full of pion+, muon+ and positrons (result of decay of two first). They're result of collisions of protons at relativistic velocity in upper region of atmosphere. Positron is also antimatter. Antiparticle of electron. The most common star fusion process is producing positrons: p+ + p+ -> D+ + e+ + Ve Also instable isotopes which have more protons than neutrons are decaying mostly through positron emission (beta decay +) Each banana is emitting 15 positrons per second http://en.wikipedia.org/wiki/Banana_equivalent_dose
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