From: goldenfieldquaternions@gmail.com   
      
   On Saturday, November 3, 2018 at 4:57:56 AM UTC-6, Sabbir Rahman wrote:   
   > On Friday, November 2, 2018 at 5:25:34 PM UTC+3, Lawrence Crowell wrote:   
   > > On Friday, November 2, 2018 at 12:24:01 AM UTC-6, ben...@hotmail.com wr=   
   ote:   
   > > > On Thursday, November 1, 2018 at 10:21:57 PM UTC, Tom Roberts wrote:   
   > > >> ...   
   > > >> For test particles the GR prediction is unambiguous:=20   
   > > >> regardless of the test particle's mass (including sign, if any) it=20   
   > > >> "falls downward" toward a positive mass and "falls upward" away from=   
    a=20   
   > > >> negative mass.   
   > > >>   
   > > >> While there is currently no experimental evidence of antimatter's=20   
   > > >> behavior in gravity, the mass of every known antiparticle is=20   
   > > >> unequivocally positive.   
   > > >> ...   
   > > >   
   > > > I am not clear how it is shown that antimatter unequivocally has   
   > > > positive mass?  As both positive and negative test masses are attract=   
   ed   
   > > > to the positive mass of the earth, then how can attraction to the ear=   
   th   
   > > > be used to distinguish between a positive and a negative test mass?   
   > >=20   
   > > It makes little sense that antimatter has negative inertial mass. The   
   > > particle antiparticle interaction would give mc^2 - mc^2 =3D E =3D 0, w=   
   here   
   > > experiments measure photons. The gravitational mass is an open   
   > > questions, and an experiment at CERN is being set up to measure this   
   > > with anti-hydrogen atoms.   
   > >=20   
   > > LC   
   >=20   
   > This is actually not correct.   
   >=20   
   > If you take the time to work it out (by considering the interactions betw=   
   een   
   > the four classes of particles I mention), you will actually find that the   
   > energy and momentum of a particle of type (I,A,P) has to have a factor of   
   > IAP in front of the usual definition, so the momentum p =3D IAPmv, the ki=   
   netic=20   
   > energy E =3D IAPmv^2/2, and the rest mass energy is IAP mc^2.   
   >=20   
   > So your assumption that negative inertial mass implies negative energy is=   
   =20   
   > not correct in general.   
   >=20   
   > In actual fact, the rest mass energy is positive for particles of class A   
   > and D, and negative for particles of class B and C.   
   >=20   
   > Now, antiparticles are of type D (well at least according to the claim ma=   
   de   
   > here), and therefore have positive energy, so the total energy released u=   
   pon=20   
   > annihilation of a particle-antiparticle pair is positive (and equal to=20   
   > 2mc^2), as expected.   
      
   You are sort of creating a physics that is at best nonstandard. Within that=   
    setting you claim my statement is false. Within standard physics I hold to=   
    what I claim. Now if antimatter changes the sign of gravitational mass, bu=   
   t not inertial mass, then antimatter would fall upwards. This would be an a=   
   dulteration of the Einstein equivalence principle. I doubt this is the case=   
   , but the CERN experiment, a reference I sent yesterday, will demonstrate w=   
   hether this is or is not the case.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)