From: poraty149@gmail.com   
      
   On Saturday, August 11, 2018 at 11:00:01 AM UTC+3, Lawrence Crowell wrote:   
   > On Friday, August 10, 2018 at 10:24:26 AM UTC-5, Y Porat wrote:   
   > > On Tuesday, August 7, 2018 at 10:04:42 AM UTC+3, Y Porat wrote:   
   > >> Does  'Dark matter ' has different densities   
   > >> in different locations of space ??   
   > >> =====   
   > >> TIA   
   > >> Y.Porat   
   > >> ===============================================   
   > >   
   > > i would add and say (and ask )   
   > > that according the picture/example   
   > > that Crowell brought j ust  above   
   > > we can say that next a bigger masess   
   > > a **wider zone** of dark matter is created   
   > > ??   
   > > ==   
   > > Y.P   
   > > ====================   
   >   
   > We really do not know the relationship between ordinary matter and dark   
   > matter for certain. A general rule for the relative prevalence of   
   > ordinary and dark matter is most likely beyond our knowledge.   
   >   
   > Clumping of matter occurred with gravitational waves in the early   
   > universe that got stretched into long wavelengths. These gravitational   
   > waves caused matter to oscillate and with ordinary matter there is   
   > enough friction by the production of electromagnetic radiation to cause   
   > them to clump. Dark matter has no friction so its gravitational   
   > interaction is purely conservative. With ordinary matter losing energy   
   > by radiation (friction) this probably provided enough gravitational   
   > potential to bind dark matter as well. This friction driven set of   
   > oscillations started by gravitational waves turned into acoustical   
   > energy in the hot medium of the universe in its first seconds to hours   
   > of existence. This anisotropy persisted with the expansion of the   
   > universe and is found in galaxies, galaxy clusters with dark matter   
   > halos. Comparisons between anisotropy of the CMB and subsequent galaxies   
   > is an ongoing program.   
   >   
   > A galaxy with little or dark matter tends to suggest there was little   
   > dark matter around to gravitationally bind to the ordinary matter, and   
   > so there was some initial anisotropy of dark matter. That leaves a big   
   > question to ponder. It is very difficult to address this question   
   > because we have no experimental evidence on what dark matter is. Eric   
   > Verlinde thinks dark matter is a type of spacetime physics, and with   
   > gravitational radiation around there might have been something odd. If   
   > dark matter is due to supersymmetric partners of ordinary matter, then   
   > the action of supergenerators to give local spacetime transformations   
   > might have played some role with primordial gravitational   
   > radiation. Maybe, and then again maybe not.   
      
   =================   
   thank you  Crowell !(and to  the moderator   
   that alwow that discussion )   
   ===   
   so we see that   
   for gravity we need 2 **active physical entities*   
      
   and mass becomes  an  ** active physical entity   
   NOT A PASSIVE PHYSICAL ENTITY ANY MORE ??!!   
   ie   
   producing forces !....   
      
   so how'suddenly ' active ??!!    by what ??   
   while 'we....'see' in mass (until now)   
   just a passive physical  entity ??!!   
   =====   
   TIA   
   Y.P   
   ============================   
      
   ==   
   TIA   
   Y.P   
   ==========================   
      
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