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Originally Posted by Vibecrewangel
Matter hasn't always existed.
Matter can be destroyed.
Energy on the other hand......
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Matter is energy (E=mc²).
Matter can also be thought of as energy concentrated at a location in space.
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Originally Posted by kellychaos
According to my understanding, matter may have been infinitely dense at one point ... but always present.
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Indeed.
One of the most interesting theories is the Ekpyrotic scenario.
"But instead of a universe springing forth in a violent instant from an infinitely small point of infinite density, the new view argues that our universe was created when two parallel "membranes" collided cataclysmically after evolving slowly in five-dimensional space over an exceedingly long period of time.
These membranes, or "branes" as theorists call them, would have floated like sheets of paper through a fifth dimension that even scientists admit they find hard to picture intuitively. (Our conventional view of 3-D physical space, along with time, make up the four known dimensions.)"
http://www.space.com/scienceastronom..._010413-1.html