gravity has been calculated to begin in planck time . F=Ma (or E=mc^2) whqtever, the argument about who came first is kinda mooted by the first drop of time . (Dark energy actually translates to DARK GRAVITY)
What is Planck time? Why does it exist?
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In particle physics and physical cosmology, Planck units are a set of units of measurement defined exclusively in terms of five universal physical constants, in such a manner that these five physical constants take on the numerical value of 1 when expressed in terms of these units.
Originally proposed in 1899 by German physicist Max Planck, these units are also known as natural units because the origin of their definition comes only from properties of nature and not from any human construct. Planck units are only one system of several systems of natural units, but Planck units are not based on properties of any prototype object or particle (that would be arbitrarily chosen), but rather on only the properties of free space. Planck units have significance for theoretical physics since they simplify several recurring algebraic expressions of physical law by nondimensionalization. They are relevant in research on unified theories such as quantum gravity.
They exist because the space inside of atoms and the space outside of atoms is divided into discreet units of volume of something that is rotating as a standing wave of energy.
That discreet volume is a Planck Mass at zero energy.
A Planck time is how long it takes for one wave to travel through the Planck mass (Planck volume) at zero energy.
Planck Length is the radius of this volume at zero energy.
The amount of space in one of these units is a constant but as the temperature moves from zero energy the Planck length and Planck time change to new values. When the radius of the volume increases the density of the volume decreases because the amount of stuff in this Planck particle (a quantum of space) remains the same. This changes the amount of particles per volume of space. If each particle contains a bit of information, this changes the volume of information per volume of space thus, changing the information density, which is really the energy density, which is changing the entropy.
See Erik Verlinde Lecture: A new view of gravity and the dark side of the cosmos.
The interesting thing is what each Planck volume is constructed of. It is constructed of 2 entangled strings each made up of a particle and an antiparticle in a quantum of matter (half a neutron) and 2 entangled virtual strings in a quantum of space (a higgs boson).