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xdrgnh
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Doesn't the expansion of the universe defy conservation of energy, as the universe expands more dark energy is being created. That means the total energy in the universe isn't stable and is increasing.
nicksauce said:GR point of view: There is no global conservation in the universe, because the FRW metric is time dependent. In GR there is only local energy conservation enforced by [tex]\nabla_{\mu}T^{\mu\nu}=0[/tex], and adding a term to the stress tensor of the form [tex]\Lambda\,g_{\mu\nu}[/tex] doesn't change that.
Newtonian point of view: As the universe gets bigger, there is more energy from dark energy. However, as the universe gets bigger, PdV work is done on it by sources of pressure. Since dark energy has a negative pressure, this work is negative, and so the two energies exactly cancel out to conserve energy.
The Expansion of the Universe refers to the observed phenomenon that the distance between galaxies in the universe is increasing over time. This was first discovered by Edwin Hubble in the 1920s and has been confirmed by numerous experiments and observations since then.
Dark Energy is a theoretical form of energy that is believed to make up about 70% of the total energy in the universe. It is thought to be the force responsible for the accelerating expansion of the universe. However, its exact nature and properties are still not fully understood.
Dark Energy is thought to be the driving force behind the accelerated expansion of the universe. It is believed to counteract the gravitational pull of matter, causing galaxies to move further apart from each other at an increasing rate.
No, the Expansion of the Universe does not violate the Conservation of Energy. While the total energy in the universe may be increasing due to the expansion, energy cannot be created or destroyed. The law of Conservation of Energy still holds true in this case.
Scientists study the Expansion of the Universe and Dark Energy through various methods, including observations of distant galaxies and their redshift, measurements of the cosmic microwave background radiation, and experiments using gravitational lensing and supernovae. These methods provide valuable data and insights into the nature of the universe and its expansion.