### 15 Answers

- RaymondLv 71 year agoFavourite answer
In the real Big Bang theory, there is no singularity. The earliest moment where the theory applies is called the Planck Time. At that moment, the density is extremely high. However, it is NOT infinite. It has a finite value that CAN be measured (it can be measured by using formulas developed by Max Planck, hence the name of the unit "Planck density".

The value is 5.15500×10^96 kg/m3

This is gigantic. However, it is EXACTLY 0% of INFINITY.

The problem with this density is not that it cannot be topped. Mathematically, you can multiply it by 2, by 10, by a million, you are still at 0% of infinity.

The real problem is that we do not understand how things work when the density is above this value. Worst, we do not understand how time itself can flow at higher densities.

This is why many people (including scientists) say that "time did not exist" before the Planck Time. It is not so much that time did not exist, but that we do not have a clue how time behaved "before" that moment. To put it bluntly, we do not know what the word "before" means, when it is applied to the Planck Time.

The word "singularity" in mathematics simply represents a part of the domain (for a function) where the output is undefined, specially if it grows without bound (what many people confuse with "infinity" which simply means "there is no finite value"). There are some (very few) cases where the singularity is a single point, but most of the time, it is a lot more than that.

In the mathematical models supporting the Big Bang theory, "time" is an input value. Energy density is an output.

In the Big Bang theory, the "singularity" is any value of time that happens to fall "before" the Planck Time. Because any output for such time is greater than the Planck density, the highest value that (for now) makes sense.

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- Annsan_In_HimLv 71 year ago
First, it wasn't 'the singularity' that expanded at the start of the BB. It was an intensely compacted atom. The singularity is that moment BEFORE the expansion started. Let me quote this scientist - According to Professor Edgar Andrews (expert in the science of large molecules) a singularity is:

"an event or situation in which one or more physical quantities (like temperature or density) become infinite in value." He goes on to show how a singularity is involved in the origins of our universe (as per the BB model). Science is not equipped to deal with infinite values because those do not conform to known laws of physics.

Time for our universe had to start at the point of that sudden expansion, for it takes time for matter to expand. The matter inside that tiny, condensed particle took time to spread out into our universe. No time, no universe. Once matter started to expand and move, gravity began to form and affect the particles, eventually causing clumps of gas, then eventually rocks. All of that required - first - time, then gravitational forces.

What is gravity? Science is in the business of describing things and tell us this: Any object that has mass is attracted to any other object that has mass by a gravitational force that is proportional to their masses and inversely proportional to the distance between them squared (and mass is the quantity of matter in a body, and matter is made of particles).

Inertia is what keeps a body moving in a straight line at constant speed unless you apply a force to it. Physicists believe that this might be due to 'empty space' not being empty at all but filled with an 'ocean' of Higgs bosons. Any object that has mass distorts the fabric of space around it, making other objects want to move towards it. The gravitational force is transmitted by as-yet-hypothetical particles called 'gravitons', which apparently don't have any mass.

BB cosmology says the universe was created in a low entropy state and this is where time links in with gravity. The universe can only run downhill from high order to low order - the entropy or randomness can increase but never decrease. So time is simply the measure and experience of change, as the universe is transformed progressively from an initial highly ordered state of low entropy to some final condition of maximum entropy. In this final condition the universe would be in a reversible state - entropy would stop increasing and time would cease to 'flow'. One idea is that immediately after the universe originated, it underwent an 'inflationary' stage in which the force of gravity was actually negative, thus pushing apart space and its contents at a fantastic speed. This inflation, it is argued, smoothed out any irregularities in the chaotic pre-inflationary universe and produced an expanded universe having low entropy. This agrees with the conclusion that energy must have been input to create a low-entropy universe. In this scenario, it was the negative gravitational field that donated this energy. But where did this get ITS energy from? From "a statistical fluctuation from primordial chaos" - a nugget that weighed a mere twenty pounds (9.07 kg) and was just 10 to the power of 26 cm in diameter (about one billionth of one billionth of one billionth of a centimetre). That answers your question, "what was the density"?

The point I want to make to you is that you need to consider the singularity BEFORE expansion (and hence before gravity). Guesses and theories are being made but because a singularity does not square with known laws of physics, this is why science struggles at this point.

Source(s): Who Made God? Searching for a theory of everything, Edgar Andrews, pp 41, 93, 116-117 (EP Books 2009)- Log in to reply to the answers

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- Jeffrey KLv 61 year ago
The Big Bang theory doesn't include the initial singularity. If it really was a singularity, it is infinitely dense, by definition. But Quantum Gravity theory might predict a finite density.

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- Ronald 7Lv 71 year ago
By General and Special Relativity there is no such thing as an Infinite Density

Infinity is something else

Nearest guestimate is 10^-17 Kilogramme/ Metre^3

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- 1 year ago
By definition, a gravitational singularity is infinitely dense, having a finite mass at a single point.

Quantum effects probably prevent the formation of a true singularity.

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- MysteryGuyLv 51 year ago
You should in theory have 2 kinds of singularity, Positive (White hole) allegedly the one thrown around with the big bang theory and negative singularity ( normal blackhole )no one knows for a fact what density was at that time but it would have been near infinity if not infinite. This can be proved by both general and special relativity,

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- Tom SLv 71 year ago
An "original singularity" is only an extrapolation of the theory, not really directly a part of the BB theory. Any singularity would, by definition, have an infinite density, which is why they likely don't exist in reality.

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- thomas fLv 71 year ago
Infinite, of course. That is the definition of a singularity.

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- Tom SLv 71 year agoReport
Yes, goring, singularity = zero volume.

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