/Tissa Perera

What about the following logic:

Given the statement:

–
The Milky Way is moving at around 600 km/s
with respect to the photons of the Cosmic Microwave Background (CMB).
This has been observed by satellites
such as COBE and WMAP as a dipole contribution to the CMB,
as photons in equilibrium at the CMB frame
get blue-shifted in the direction of the motion
and red-shifted in the opposite direction.
–

and also:

–
the solar system is orbiting galactic center at about 200 km/sec
–

and also:

–
the earth has a velocity of 30 km/sec around the sun.
–
and also

–
ref: Dark Matter search
http://arxiv.org/abs/astro-ph/0307403
Fig 10

Harmonic DAMA/NaI experimental data
indicates an annual oscillation of detected radiation flux
detected on earth.
–

Has anyone done the trigonometry in order to calculate
the correlation of annual DAMA/NaI experimental data
on earth due to earth_solar annual differential velocity projection
to CMB velocity vector?

I have found some information to answer the question.
Possibly you could comment.

The CMB ‘hot spot’ or ‘wind origin’ is in constellation Leo

http://aether.lbl.gov/www/projects/u2/

Now the earth moves around the sun at 30 km/sec
The hypothesis would be that average flux would be
when earth – sun line
would be parallel
to earth – Leo line
which occurs September 1 (sun in Leo) and March 1.
with maximum flux (earth against the CMB dipole wind) on December 1
and minimum (CMB dipole wind to earth’s back) on June 1.

This is 180 degrees out of phase with your data
but perhaps that is a reflection of dark matter reality

This CMB dipole wind and earth solar rotation
are then approximately 180 degrees of phase with data expressed in:

http://arxiv.org/abs/astro-ph/0307403
Fig 10

http://arxiv.org/abs/0704.3543
Figure 2

where t0 = 152.5 is ~June 1 (maximum flux)

Is this a coincidence or an indication
of connection between DAMA/NaI observed data and CMB dipole wind.

I am interested in the above from the point of view
that dark matter exists in congruence with CMB
and critical space density as follows:

m/B3 ~ critical space density 2 H2 / (8 pi G) = 6E-30 g/cm3

where:

B = 22 cm
m = 56 Mev/c2 (110 x electron mass)

and may be a source of your observed annual DAMA NaI observation.

1: Don’t get confused by the fact that the consensus is that we live in a “cold dark matter” (CDM) universe… although they both refer to the same aspect of dark matter (the relative velocity dispersion of nearby dark matter particles), the “cold” in CDM basically means that they’re not moving relativistically, merely at a pedestrian 200 km/s. That’s still plenty “hot” enough to keep them from clustering around the Earth, though.

2: This is known as the “Jeans mass”, and is actually the same quantity that’s used when talking about the collapse of gas clouds to form stars. In that case, it’s the individual atoms in the gas cloud that are moving about (we normally call that temperature… see point 1 above), and you need a given amount of mass to have enough gravity to overcome a given temperature.

Viggen, think of it this way: If you walk into a sprinkler, you’ll get wetter than if you walk away from it. GR doesn’t prevent water droplets from having a special direction with respect to the center of their distribution. Same thing with dark matter in a galaxy.

[TMB]

1) The amplitude and phase of the annual modulation are consistent with what you would expect from a DM signal.

2) The DAMA/LIBRA signal is within the error margin of the DAMA/NaI signal, except for a 2 sigma deviation in one energy bin. After dismantling the old apparatus, and installing the new detector and presumably making changes to other things as well, how likely is it for the alleged systematic error to cause a fake DM like signal within the bounds of the previously “detected” signal?

3) Absense of spurious signals. Sean’s hypothetical ski season effect has a period of one year, but such an effect, however it is supposed to work, will generically have higher harmonics with relatively large amplitudes. The effect causing the detected signal does not. It seems to vary quite smoothly over the course of a year, consistent with how an expected DM signal should behave.

4) Absense of an annual modulation in the multiple hit signal. The DAMA/NaI and DAMA/LIBRA experiment use not one but a few detectors. Unlike weakly interacting DM particles, cosmic rays like muons have a significant probability of hitting more than one detector. By looking at the multiple hit events you can estimate the background. If the annual modulation were to be caused by variations in the muon flux you would see an annual modulation in the multiple hit rates as well.

Another thing to think about:

The DAMA team made public a very significant effect, but there are smaller effects like a diurnal modulation (caused by the rotation of the earth) that by now should be visible but are probably not yet statistically significant. If such signals turn out to be nonexisting in the future as more data comes in, then that would falsify that the annual modulation is due to DM.

So, I guess that the DAMA team waited until they saw a diurnal modulation constent with what one would expect given the annual modulation and went ahead with announcing the annual modulation results.

Will they ban us? Or did we pass the test thanks to the Italians?

Nevertheless, it would seem that it exists in quantities that should have an effect.

Pfft. Have fun on your voyage while we debate semantics.

The significance of June/December vs. other months is that it is during those months that the Earth’s movement around the Sun is best aligned with the motion of the Sun around the Milky Way. If an observer on the Sun were watching the Earth as it was being lit by the radiation escaping from the accretion disk around the black hole at the center of the Milky Way, at June 2 that observer would see a “Full Earth” while at around December 2 (presumably) would be a “New Earth.”

Very Cool!!

The most important thing is that if confirmed it proves that Dark Matter exists! The only other option besides dark matter is another theory of gravity and gravity as it is is complicated and mysterious enough.

Now you know the awful truth. The Dark Matter signal is rooted in peoples’ insatiable hunger for regular time off.

Then what is the significance of a peak in June and a trough in December? Why not a peak in April and a trough in October? Why is the earth moving “into the DM wind” in June? Doesn’t it signify something about the relationship of DM to the galaxy?

I’m rooting for DM being something that has absolutely no physically detectable connection with this universe other than gravity. If it doesn’t turn out to be the gravitational interaction of baryon-like particles across branes, I will be sorely disappointed.

That would be great. If that could be shown, then brane theory would get a huge boost. The reason it seems like a possibility is that there are some hypotheses that state that the reason gravity is so weak compared to (and hence hard to unify with) the other forces is that it really isn’t weaker, but that much of the force “leaks” out of our universe. That would be brilliant. Of course, my knowledge of this is very limited, so perhaps Phil will come back and smash our hopes to tiny, yet massive, hard to detect bits.

“…. If weâ??re spinning relative to the center of the galaxy, wouldnâ??t our view of the stars change? ….”

Most of the stars we can see are pretty close to us on a galactic scale and are moving around the galactic centre at about the same speed and in roughly the same direction so their positions relative to us change pretty slowly (though stars do have “proper motions” across the sky). Also, it takes us about 200 million years to go round the galaxy so any change of perspective is not likely to be blindingly obvious over the course of an evening or two.