Re: Neutrino's Energy Has Gravity

The TimeLord wrote: 
Nick <macromitch@xxxxxxxxx> wrote in
<1117085358.688898.247070@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> on Thursday 26 May
2005 00:29 posted to sci.physics.relativity:


If neutrinos don't have mass they still have energy.
They are not nothing!



They would only be like photons in that respect.


According to GR by their energy they will always effect the gravity of
the universe.


No, even in GR gravity is produced by matter,

Err, not only. The source for gravity in GR is the energy-momentum tensor. Energy "produces" gravity, pressure does, too.


which always has mass, since
mass is defined to be the amount of matter. Photons do not produce gravity,

They do. What do *you* think why one considers the radiation density in cosmology?


since they have no mass, even though they have energy and momentum. 

And that's enough for them to "produce" gravity.


How hard is that? 


Well, the discussion may be moot anyway, since most physicists think that
neutrinos have mass after all, based on the Superkamiokande results.


And the SNO results. And some others.


Bye,
Bjoern

.

Relevant Pages

  • Re: Curved space
    ... not caused by gravity in the same sense of scale from Newtonian models. ... force by knowing the mass of the star and the mass of the photon and the ... Dark Matter came about from the discovery that stars at the edges of spiral ...
    (talk.origins)
  • Re: Slabinski and Mingst/Stowe disagree in Pushing Gravity
    ... >>1) It is the transparency of matter that gives rise to Newton's equation, ... > gravitational mass to be equal, and for Newton's third law to be true, ... >>> that gravity is proportional to mass rather than volume. ... >>LeSage assumed that corpuscles have their energy perfectly absorbed. ...
    (sci.physics.relativity)
  • Re: How do we know antimatter has POSITIVE mass?
    ... | QFT both suggest that like matter, antimatter has positive energy. ... acceleration due to a gravity of a negative ...
    (sci.physics)
  • Re: Curved space
    ... it's effects on the matter we can see. ... (I still find mass attracting mass ... Still following the "gravity" field, ... A yard stick in dense space would be shorter than ...
    (talk.origins)
  • Re: How do we know antimatter has POSITIVE mass?
    ... | QFT both suggest that like matter, antimatter has positive energy. ... acceleration due to a gravity of a negative ...
    (sci.physics)