Tag Info

New answers tagged

-1

There is a concept known as entelechia, which basically means an idea so complicated and so full of border cases that no useful ideas can be obtained from it. One entelechia is the concepto of god, a súper being who created everything in just 6 days and who needs your money. And the fossil record was put there by good just to test your faith. Eventually it ...


3

The problem is analogous to the physics of gases. Do we need to describe the chaotic motion of every molecule before we can determine overall properties? No.


2

this may or may not be a misunderstanding, but there is no centre of the universe. Imagine the universe as being the surface of an expanding balloon, with all the galaxies and stars on the surface, being stretched away from each other. Just as there is no centre, for example, of the Earth's surface, there is no centre of the universe. If by 'centre' you mean ...


1

Yes you are correct Sophia. This is a major component of the standard model itself, which concludes the opposite (that space is expanding in an infinite cosmos), but the only reason a conclusion like that comes about, is because what we observe is indistinguishable from being at the centre of a finite universe that races away from precisely us, uniformly in ...


0

It is perhaps best to look at the entropy of an extremely dense system in terms of information (think von Neumann entropy). Although we do not know how superdense and superenergetic matter quantizes exactly (we would need a theory of quantum gravity for that), it is clear that it must. As such, in this extreme state, particles have likely been squeezed into ...


0

Your logic is flawed in that all mass-energy did not come from the same source. All mass-energy was created in a fairly even distribution across the universe, however without inflation, the different regions of the universe were not in causal contact with each other.


0

Since at the infinitesimal singularity there was less space, there were less microstates. If you consider a cup of cold water in a pressurised, insulated vessel at absolute zero, the system has zero entropy because the atoms cannot move, there is no energy and thus less possible states the system can be in. Here we have the opposite, but the same situation: ...


1

Let me show you that there is no contradiction by pointing out e.g. that for ordinary expansion periods (that is away from first order phase transitions, decouplings...) the total entropy is actually constant in time while the universe is getting bigger and cooler. Or, going back in time, the universe is getting hotter while S is kept constant. How is this ...


0

Entropy is not the existence of heat or energy, but is more accurately described as the spread of energy. A universe with high heat and low matter density has very low entropy, the same way that a cup of hot water has low energy distribution when compared to a cold pool. If you throw the hot water into the cold pool the heat will spread throughout the pool ...


0

In physics, the universe may be defined as the smallest system containing the earth and not interacting with something outside it. This is in agreement with the common usage of the term in astronomy and cosmology. It has a precise meaning in any concrete mathematically formulated theory of physics. In each such theory, there is only a single such system. ...


2

It's an example of adiabatic expansion. If you have a container full of gas and you expand the container, the gas cools. Entropy is preserved. Adiabatic processes preserve entropy. Any decrease in entropy due to lowered energy, and correspondingly fewer possible velocities for the particles, is offset by an increase in entropy due to the expanding volume, ...



Top 50 recent answers are included