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what is the evidence that universe is 13.7B years old?

Hans Blaster

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Are you talking about how the laws of thermodynamics apply to the universe as a whole and its creation, or something else?
 
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Yet another assertion.
Everything we assert is an assertion. You have made many assertions, as have I. The difference is you seem unwilling to back up your assertions.

The principle of controlling nuclear energy is based on the 2nd Law of thermodynamics. Energy disperses through distance.

For example, D=ME/6r^2 works because the 2nd Law is a constant.

Your turn. Give an example of how energy becomes more concentrated absent any external control.

Can you, or were you just making unsubstantiated assumptions?
 
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Are you talking about how the laws of thermodynamics apply to the universe as a whole and its creation, or something else?
I am applying it solely to creation (in a closed system apart from any other forces).

The only way I can see an outcome in the way of creation is if there were several energy sources that existed eternally, and for some reason these sources had an abundance of kinetic energy so that they could somehow interact. But then it still seems the interaction would lead to dispursement (pair production, for example, does not result in order. 1.022 MeV is converted into a b+ and b- particle, each with the mass equlivant of .511 MeV which eventually should collide with their respective opposite and result again in energy, 1.022 MeV traveling in a different direction...and kinetic energy).

I am trying to understand how whatever is thought of to have existed prior to anything being formed could have formed anything.
 
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Astrid

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I guess I will stick to honest conversations.
Bye.
 
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Hans Blaster

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I am applying it solely to creation (in a closed system apart from any other forces).

OK. But we should consider that the Universe we know of may have been part of something larger at the point it began.


As far as we can tell the total energy of the Universe is zero which does not create a significant barrier to spontaneous generation in a quantum fluctuation in a source "substance".

I am trying to understand how whatever is thought of to have existed prior to anything being formed could have formed anything.

If it had physical and quantum properties (like the universe it spawned) it would have no problem forming a universe. Many of the sourcing theories for the origin of our Universe assume some sort of background something from which the Universe emerges and that thing always existed. This avoids the philosopher's question "how did something come from nothing" if the something didn't come from a nothing. If you have a problem with a substance that always existed and has no cause it is understandable. (It is also unproven.)
 
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OK. But we should consider that the Universe we know of may have been part of something larger at the point it began.
Good point. What I mean is the first thing.

Either way it is an issue of faith, I suppose. Do we believe in God, or a god? Or do we believe in a preexisting something?

I enjoy thinking about how things could have come about (or how God created). But this is where science becomes scientific philosophy and religion becomes religious philosophy.
 
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Hans Blaster

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And given that even my last post requires going beyond what is known (and likely can be known). I lose interest for just that reason.
 
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AV1611VET

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And in the midst of this, if I actually thought some septic skeptic was only here to put the ol' Kibosh on your faith, I'd be one of the first ones to land full frontal on them. That, I guarantee, would not be a pretty sight!
LOL

I'm hiring you as my official body guard!
 
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AV1611VET

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If you want to talk origin of the universe you are in way over your head.
Thermodynamics had nothing to do with the creation of the universe.

In fact, the level of mass/energy started out at zero, then was raised to its current level over a six-day period via a string of miracles.
 
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sjastro

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I've noticed when you discuss science in this thread there are errors.
For example in your post #104 you seem to under the impression a proton/electron pair are produced from a gamma photon when it is in fact a positron/electron pair.
A proton is not a positron.

What you are describing are the reactions defined by the equations;
(1) γ → e⁺+ e⁻ which is positron/electron pair production.
(2) e⁺+ e⁻ → 2γ which is positron/electron annihilation.
Where γ, e⁺, e⁻ are the gamma photon, positron and electron respectively.

Notice there is no symmetry between equations (1) and (2); in equation (1) a single photon of energy 1.022 MeV is required for positron/electron pair production whereas in equation (2) 2 x 0.511 MeV photons are created from positron/electron annihilation.

In equation (2) both energy and momentum are conserved, in equation (1) only energy is conserved.
Equation (1) can therefore not occur in the classical physics version of a vacuum where only an external electric field is present devoid of matter; it requires matter such as an atom of atomic number Z to take some of the momentum of the electron/positron pair in the form of recoil in order for momentum to be conserved.


You don't have to conjure up exotic mechanisms such as external energy sources when an external electric field and an atom will do for pair production to occur.

In the case of annihilation when the electron/positron rest mass energy plus kinetic energy exceeds 0.511 MeV a range of other particles are produced.

 
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SelfSim

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Where the external E field there, is taken as primordial in the cosmological context, no(?)
 
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sjastro

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Where the external E field there, is taken as primordial in the cosmological context, no(?)
In a local context the external E-field could be the field between two charged plates or the electric field of an atom.
In a cosmological context one doesn't even need an electric field, in the early history of the universe temperatures were high enough for photons to reach energies where positron/electron production occurred.
This however leads to a problem that the universe should contain equal amounts of matter and antimatter.
Baryon asymmetry - Wikipedia
 
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Thanks for the correction. I'm using my phone and didn't catch that one. I understand it is a positron/electron pair. A proton has significantly more mass than an electron.

Pair production is a gamma interaction and is caused when a photon (not proton) passes just outside the nucleus of an atom. The result is an electron and a positron. The electron is technically a negatron because an electron orbits (or orbited) the nucleus of an atom.

Annihilation is when one of the pair meets its opposite. The interaction produces energy equlivant to its mass.

Yes, a strong Coulomb field in a vacuum can result in pair production. I don't mention that at all. Thanks for bringing it up.

Do strong Coulomb fields in a vacuum exist naturally?
 
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sjastro

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Do strong Coulomb fields in a vacuum exist naturally?
From a classical physics perspective at cosmological scales the electron number density
nₑ ≈ 1 m⁻³.
At such ridiculously low densities far beyond the very best vacuums found in laboratories this is approximated as an infinitely conductive plasma.
Most people are familiar with Ohm’s law and in its generalized version the equation is
J = σE where J is the current density, σ is the conductivity and E the electric field.

Dividing both sides by E;
J/E = σ
As σ → ∞, E → 0
For infinitely conductive plasmas, the overall electric field is zero hence at cosmological scales the electric field is for all intents and purposes zero.

However there is Quantum Field Theory where a vacuum is a field with the lowest energy.
Vacuum energy is a property of space-time.
There are different types of vacuums including an electromagnetic vacuum.
In this electromagnetic vacuum virtual particle/antiparticle pairs are created as vacuum fluctuations and destroyed in a very short time frame.
These virtual particles have been confirmed experimentally in the lab as the electromagnetic vacuum exerts pressure via the Casimir effect.
 
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So what are the odds that energy spontaneously becomes matter in nature?
 
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sjastro

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For those who think BB cosmology has all the answers.....
 
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