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BobbyHurley
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Is the "missing mass" the mass of the photons connected to and neighboring the matter which are displaced by the matter?
This doesn't even make sense. There is no such thing as a "massive" photon. Photons are massless.BobbyHurley said:Is dark matter a sea of massive photons?
I can't make any sense out of this sentence but I'm sure the answer is no.Is the "missing mass" the mass of the photons connected to and neighboring the matter which are displaced by the matter?
phinds said:This doesn't even make sense. There is no such thing as a "massive" photon. Photons are massless.
I can't make any sense out of this sentence but I'm sure the answer is no.
BobbyHurley said:Massive Photon and Dark Energy
I still can't figure out what you mean by that. What particles displaced by what matter?BobbyHurley said:Could the "missing mass" associated with dark matter actually be the mass of the particles displaced by the matter?
the nonvanishing photon mass of the order of 10 - 34eV is consistent with the current observations. This magnitude is far less than the most stringent limit on the photon mass available so far, which is of the order of m<=10 - 27eV.
But the paper discusses whether photons with a small mass could explain Dark Energy not Dark Matter.ChrisVer said:I am not sure, but even if photons had a mass below the excluded by experiment region let's say [itex]10^{-27}eV[/itex], then the photons are still supposed to be radiation (under cosmology), so at best they could account for HDM and not CDM.
Garth said:Peter have you a reference(s) to your statement that it "is ruled out by experiment unless the "scalar" and "vector" parts are given coupling constants so small as to be negligible"?
ChrisVer said:even if photons had a mass below the excluded by experiment region let's say ##10^{-27}## eV, then the photons are still supposed to be radiation (under cosmology), so at best they could account for HDM and not CDM.
PeterDonis said:I agree if we are using GR as our theory of gravity. The paper the OP linked to talks about a different theory of gravity, a "scalar-vector-tensor" theory, which can produce different behavior of photons, theoretically speaking.
The theory consists of massive vector field and Stuckelberg scalar field interacting with Einstein gravity.
George Jones said:The introduction seems to say that it is QED that is modified, not GR
The TeVeS theories were proposed after MTW was published and are not inconsistent with solar system tests, papers can be found here: The Tensor-Vector-Scalar theory and its cosmology and A tensor-vector-scalar framework for modified dynamics and cosmic dark matter except, as that latter paper proposes, the MOND increase (over Newtonian/GR gravity) of gravitational sun-wards acceleration at large radii in the outer solar system would be interpreted as a Pioneer type anomaly.PeterDonis said:I'm going by what I have seen in textbooks such as MTW, which IIRC discusses this in some detail. As I remember it (don't have my copy handy to check), various solar system tests, such as light bending by the Sun, rule out significant scalar or vector terms in the Lagrangian. The paper that the OP linked to talks about comparisons with cosmological data, but does not talk at all about consistency with other data such as solar system tests.
TeVeS cannot explain observations without assuming an additional dark mass component in both cluster centers, which is in accordance with previous work.
I agree but some might say that about the [itex]\Lambda[/itex]CDM theory, what with the undiscovered dark sector, the coincidence problems - [itex]\Omega_M \sim \Omega_\Lambda [/itex], [itex]\Omega_m + \Omega_{DM} + \Omega_\Lambda = 1[/itex] , Age of Universe = H-1, and built on GR which has proved so far incompatible with quantum theory.Chronos said:I still think TeVes is a mathematical cluster of hooey.
Dark matter is a hypothetical type of matter that is believed to make up a large portion of the universe. It cannot be seen or detected by traditional means, but its existence is inferred through its gravitational effects on visible matter.
Massive photons are one of the proposed explanations for dark matter. They are particles with mass that travel at the speed of light, and some theories suggest that they could account for the missing mass in the universe that is attributed to dark matter.
Currently, there is no conclusive evidence that dark matter is a sea of massive photons. While some theories suggest this as a possibility, it is still a topic of ongoing research and debate in the scientific community.
Scientists use various methods to study the effects of dark matter, such as observing its gravitational effects on visible matter, looking for signals from dark matter interactions, and studying the cosmic microwave background radiation. They also conduct experiments using particle accelerators to try and produce dark matter particles.
Understanding dark matter is crucial because it makes up a significant portion of the universe and has a significant impact on the formation and evolution of galaxies. It also plays a role in the structure of the universe and could potentially impact our understanding of fundamental laws of physics.