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The process inverse to particle annihilation can be called matter creation; more precisely, we are considering here the process obtained under time reversal of the annihilation process. This process is also known as pair production , and can be described as the conversion of light particles (i.e., photons) into one or more massive particles .
Some physicists, such as Lawrence Krauss, Stephen Hawking or Alexander Vilenkin, call or called this state "a universe from nothingness", although the zero-energy universe model requires both a matter field with positive energy and a gravitational field with negative energy to exist. [2] The hypothesis is broadly discussed in popular sources.
Creatio ex nihilo is the doctrine that all matter was created out of nothing by God in an initial or a beginning moment where the cosmos came into existence. [13] [14] The third-century founder of Neoplatonism, Plotinus, argued that the cosmos was instead an emanation from God.
In their interaction with earlier Greek philosophers who accepted this argument/dictum, Christian authors who accepted creatio ex nihilo, like Origen, simply denied the essential premise that something cannot come from nothing, and viewed it as a presumption of a limitation of God's power; God was seen as in fact able to create something out of ...
From this point on, and for several billion years to come, the presence of dark matter accelerates the formation of structure in the universe. In the early universe, dark matter gradually gathers in huge filaments under the effects of gravity, collapsing faster than ordinary (baryonic) matter because its collapse is not slowed by radiation ...
A definition of "matter" based on its physical and chemical structure is: matter is made up of atoms. [17] Such atomic matter is also sometimes termed ordinary matter. As an example, deoxyribonucleic acid molecules (DNA) are matter under this definition because they are made of atoms.
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Parmenides suggested it did not exist and used this to argue for the non-existence of change, motion, and differentiation, among other things. [2] In response to Parmenides, Democritus, one of the early proponents of atomism, posited that the universe was composed of atoms moving through the Void. According to Democritus, the Void was a ...