hi reunite. great questions! i hope you dont mind me chiming in here with my perspective. like everything in this field, take what you like, use discernment, and dump the rest. we can always go back and reassess the information again later. i dont know many answers on this as we are all continually learning, but hopefully some of the information i provide here from these sources will help you.
here is my take, which is information drawn from sources which resonate with me: sanat, operation terra, hidden_hand, 'power vs force' by david hawkins, some 'undoing the ego' books, alex colliers lectures and his book 'defending sacred ground', and the Handbooks for the New Paradigm.
from collier, there were 11 densities. eons ago, we were 11th density beings (the Pa Taal, or The Founders) but decided to re-experience 3rd density again. so, humans fell through the densities and incarnated on 3rd density. this is almost like virtual reality for us. we are asleep in this dimension. the 2012 'phenomena' is like our alarm clock going off, waking us up out of this dream.
collier, via the andromedan perspective, states that in 1994, a color-sound frequency began emanating from the black holes in our galaxy. this frequency is causing everything in this galaxy to ascend. 2nd density is moving to 3rd, 3rd is moving to 4th, and so on. this is all being created by 12th density beings. who or what they are or what it is is unknown to even the andromedans.
i believe the concept of densities and dimensions are basically the same thing. densities seems to be a better way to describe them. as one moves up the scale, one becomes lighter and vibrates at a higher frequency, like you said.
the site below has some good information that will help explain levels of consciousness, and this is drawn from hawkins` material. it will help illustrate how the rise in densities and thus the rise in vibration and being "lighter" makes some connection. its not all of the answers, but it helped answer some of my questions:
http://www.stevepavlina.com/blog/2005/04/levels-of-consciousness/ this is from the Ra information: (my take in parentheses)
1. 1ST DENSITY: The cycle of awareness (basic instinctual animal behavior)
2. 2ND DENSITY: Growth (dogs, chimps, animals that respond to us emotionally)
3. 3RD DENSITY: Self-awareness (us, becoming aware)
4. 4TH DENSITY: Love or understanding (out of my realm of understanding right now)
5. 5TH DENSITY: Light or wisdom
6. 6TH DENSITY: Light/love, love/light or unity, also frequently referred to as compassionate wisdom
7. 7TH DENSITY: The gateway cycle-- also frequently referred to as that density where one perceives the sacramental nature of all things.
RA: At the 7th level or dimension, we shall. if our humble efforts are sufficient, become one with all, thus having no memory, no identity, no past or future, but existing in the all. (B1,153)
8.8TH DENSITY: The octave which moves into a mystery we do not plumb.
QUESTION: Does this mean that in the 8th density you would have awareness of all that is?
RA: This is partially correct. It is our understanding that it would not be our awareness, but the awareness of the Creator. In the Creator is all there is.
info source:
http://www.spiritofra.com/Ra-section%201.htm the Ra material states there are only 8 densities. the andromedan perspective has 12. it could be that the Ra source is simply not conscious of any higher dimensions, but the andromedans, via higher beings they are in contact with, are aware. or one source is mistaken. the andromedan perspective resonates with me, so i lean towards belief in that source.
this will give you a good breakdown on each density, according to Ra. i think this is what you really are interested in:
http://lawofone.info/results.php?category=Densities the infinite creator/the Source resides in all of us- every being. it transcends the scale, in my opinion, or one could say that the Source resides on every single density level. each of us are particles of the Source, and through each of us, the Source is able to see everything from every perspective.
imagine you are observing a rainbow. the viewpoint of where you are viewing the rainbow is only one perspective of the rainbow, as everyone sees a rainbow because everyone is standing at a different point. one cannot get a real understanding of the nature of the rainbow without viewing it from many different angles. only when we can see the rainbow from every single possible angle can we really KNOW the nature of the rainbow. and that is what the Source does with us: sees everything from every angle.
there is no zero density in anything ive read.
as we ascend the densities, we will be able to see things differently. according to collier/the andromedans, jupiter is a blue star in 5th density, and as we move to the 4th density, we will be able to see a wider spectrum of colors.
this stuff is taken from mostly the hidden hand and sanats 2012 website, which is a wealth of info:
regarding your question regarding 3rd density beings on earth who dont ascend:
at the time of harvest, there will be 3 different earths.
- for those StS (service to self), they will go to the 4th density negative earth to work off their karma. [the Hidden_hand perspectives take is that those ultra-dark forces paradoxically are good and created the disparity between good and evil so that humans could choose and evolve.]
- for those StO (service to others), they will move to 4th density positive. the andromedans say that we will move to 5th density soon after that, joining our galactic family.
- for those who dont fit into either of these categories, which is, unfortunately, most of the human race, they will unknowingly create a third reality- another third density for themselves where they will continue on until they 'get it'. theyll be opportunities for them to evolve out of it when theyre ready. someone else can probably better explain this, but this new 3rd density reality is created by these humans` consciousnesses, as the fabric of space- time bends around them (since they are not moving with the ascension of the galaxy, but staying stationary). they, essentially create a black hole and in their reality, they drop out of our reality and into another "dimension" where they can continue to live in 3rd density.
like seeing a rainbow from many different viewpoints will help the Source see the true nature of the rainbow, gathering many different viewpoints on this stuff will help us to better see the true nature of consciousness.