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Drag Spirals



Picture%202This page describes one mechanism by which antigravity matter can create galaxy spiral arms. In this description it is assumed that the volume of space affected by the antigravity matter vortex is spherical.


This mechanism for creating drag spirals requires that there is not too much winding in the galaxy disc.Winding is where objects orbiting at a large radius take longer to complete an orbit than objects orbiting at a small radius.Where there is a lot of winding any radial or spiral structure will be quickly shredded.


Winding is reduced when the antigravity matter vortex has bottomed-out.That is, the density of antigravity matter within the galaxy is low and fairly constant over a large radius.


Picture%204Within the bottomed-out region both the gravitational acceleration felt by a normal matter object and the circular orbital velocity of a normal matter object increase in proportion to radius as explained here.Well away from the centre the gravitational acceleration reduces according to the inverse square law.


The result is that a group of stars in the bottomed-out region can orbit in almost fixed formation independent of radius.If one of the stars in the group loses kinetic energy it moves approximately radially inwards in relation to its neighbours.Further out there is a lot more winding and outer stars get left behind by inner stars.

Consider a group of stars orbiting within such a bottomed-out region.They pass though antigravity matter and experience AGM Drag.They lose energy and spiral inwards towards the centre.The groupís antigravity matter wake stretches out behind it in the direction of the relative flow of the antigravity matter wind.In the region of this wake the effect of the antigravity matter wind is reduced.

Now consider a second group of stars which happen to be orbiting the galaxy in the wake of the first group.

The second group experiences less drag and loses energy slower.The first group moves inwards almost radially with respect to the second group until the second group is no longer within the wake of the first group.The second group then feels more drag and begins to move inward with the first group.

A third group of stars similarly finds a stable position when it moves out of the wake of the first two groups and further groups continue to add to the sequence.Eventually the groups build a spiral arm.The arm is aligned at a shallow angle to the relative direction of the antigravity matter wind.


Small fluctuations in the density of stars may exist along the length of the arm.An area of reduced density causes an increase in the drag on the stars just outside (downwind from) that area.Those outer stars then lose energy and fall inwards faster to fill the density gap.Similarly an area of increased density causes a reduction in drag on the stars just outside (downwind from) that area.Those stars move inwards more slowly relative to those that are not shielded.Anti gravity matter therefore provides a mechanism by which the spiral arm tends to retain its linear structure and for example tends not to degrade into separate groups of stars.

The stars generate molecular clouds either during or at the end of their lives.The clouds are less dense than stars and are affected more by the antigravity matter wind.The clouds are swept outwards along the trailing edge of the spiral arm.

However winding may not be completely eliminated.The outer end of the spiral arm may take longer to orbit the galaxy than the inner end and the arm is stretched. Eventually the arm breaks.The leading end of the outer section slows due to drag and begins to fall inward.


© Copyright Tim E Simmons 2009 to 2015. Last updated 21st May 2015.