Exploring the Mystery of Dark Flow: How Does It Work?

In summary, there is a theory known as dark flow that suggests the existence of another universe pulling our own universe apart by gravity. This theory is based on observations of residual cosmic microwave background radiation dipole and temperature decrement in cluster galaxies. If true, it could have significant implications on our understanding of the universe. However, there is still some uncertainty and further research is needed to confirm this theory.
  • #1
filegraphy
93
0
How does dark flow work? Thanks
 
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  • #2
It probably is just an artifact of imagination and the imagery taken. I personally don't believe that it exists.
 
  • #3
A prove that there is another universe which pulls our universe apart by gravity. Dark matters are actually matters in another universe which explains why it has not been detected so far?
"Big bang" might actually be a "big pull" - empty space being torn apart fby another universe. The universe may actually be infinite. Tear and crunch are actually manifestations of different components of the "whole"
 
  • #4
bchui said:
A prove that there is another universe which pulls our universe apart by gravity. Dark matters are actually matters in another universe which explains why it has not been detected so far?
"Big bang" might actually be a "big pull" - empty space being torn apart fby another universe. The universe may actually be infinite. Tear and crunch are actually manifestations of different components of the "whole"

Yeah, it's a HUUUUUUGE might, that is more popsci than science.
 
  • #5
thanks for answering
 
  • #6
If true Dark Flow could be one of the most important observations since the CMBR. Looking forward to hearing the latest updates on this discovery. For one thing it would change our views a little on a homogenious and isotropic universe at different scales.


http://www.sciencedaily.com/releases/2010/03/100310162829.htm

http://en.wikipedia.org/wiki/Dark_flow

http://www.kashlinsky.info/anima/skash.nsf/home?OpenForm



"We now summarize the main conclusions from this study:

• Our measurements indicate the existence of the residual CMB dipole evaluated over
the CMB pixels associated with the hot SZ producing gas in clusters of galaxies. The dipole
is measured at high-signifance level (∼ 8σ in the outer bins) and persists out the limit of
our cluster catalog zmedian 0.1. Its direction is not far off the direction of the ”global CMB
dipole” measured from the entire unprocessed maps.

• We show with detailed simulation that the CMB mask and/or cluster sample discreteness
induced cross-talk effects are negligible and cannot mimic the measured dipole.

• The dipole originates exclusively at the cluster pixels and, hence, cannot be produced
by foregrounds or instrument noise. It must originate from the CMB photons that have
passed through the hot gas in the catalog clusters.

• We prove that the signal arises from the hot SZ producing cluster gas because we
demonstrate that in the unfiltered CMB maps there remains statistically significant temperature
decrement as expected from the TSZ effect. Its profile is consistent with the NFW
profile out the largest aperture where we still detect hot gas (∼ 30). At larger radii the
dipole begins to decrease as expected.

• In the filtered maps, designed to reduce the cosmological CMB fluctuations, the dipole
is isolated simultaneously as the monopole component vanishes. This proves that its origin
lies in the KSZ component. The monopole vanishes (within the noise) because for the
NFW profile the gas in hydrostatic equilibrium must have a strong decrease in the X-ray
temperature in the outer parts. This decrease is consistent with the available direct X-ray
measurements, but more importantly is demonstrated empirically in AKKE.

• With the current cluster catalog we determine that the amplitude of the dipole corresponds
to bulk flow of 600-1000 km/sec. This conversion factor, C1,100, may however
have some systematic offset related to our current cluster modelling. However, this possible
uncertainty only affect the amplitude of the motion, not its coherence scale or existence.

• The cosmological implications are discussed in Kashlinsky et al (2008). We show
there that the concordance ΛCDM model cannot account for this motion at many standard
deviations. Instead, it is possible that this motion extends all the way to the current cosmological
horizon and may originate from the tilt across the observable Universe from far away
pre-inflationary inhomogeneities (Kashlinsky et al 1994; Turner 1991)."


I suggest they prove their method by looking in a few other directions to see if there are other dark flows or if this a unique one off event.
 
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  • #7
If true a lot of things would blow away previous discoveries... got to watch out for those big if's.
 
  • #8
Here is the answer:
Dark matter travels at around six miles (nine kilometers) per second.

http://news.nationalgeographic.com/news/2006/02/0213_060213_dark_matter.html
 
Last edited by a moderator:

1. What is Dark Flow?

Dark Flow is a phenomenon in astrophysics that describes the movement of galaxies in a particular direction with a consistent velocity, despite the fact that the expansion of the universe should cause them to move in random directions. It appears to be a large-scale flow of matter that is not influenced by the gravity of nearby objects.

2. How is Dark Flow different from Dark Matter?

Dark Flow and Dark Matter are two separate and distinct concepts. Dark Matter is a type of matter that does not emit or absorb light, but can be detected through its gravitational effects on visible matter. Dark Flow, on the other hand, is a phenomenon that describes the movement of galaxies in a particular direction, and is not related to the presence of dark matter.

3. What causes Dark Flow?

The exact cause of Dark Flow is still a mystery, but it is believed to be related to the large-scale structure of the universe and the gravitational pull of unknown objects beyond our observable universe. Some theories suggest that it could be a remnant of the early universe, while others propose that it could be a result of the influence of neighboring universes.

4. How is Dark Flow detected?

Dark Flow is detected through observations of the Cosmic Microwave Background (CMB) radiation, which is the leftover thermal radiation from the early universe. Scientists analyze the fluctuations in the CMB to determine the direction and velocity of the flow of galaxies. This can be done using advanced telescopes and satellite missions, such as the Wilkinson Microwave Anisotropy Probe (WMAP) and the Planck satellite.

5. What implications does Dark Flow have for our understanding of the universe?

The existence of Dark Flow challenges our current understanding of the universe and raises many questions about the nature of space and time. It suggests that there may be unknown forces or structures at work on a grand scale that we have yet to discover. Studying Dark Flow can provide valuable insights into the evolution and structure of the universe, and may lead to breakthroughs in our understanding of fundamental physics.

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