Re: How much can you compress a particle?

On Sep 27, 7:51 am, Igor <thoov...@xxxxxxxxxx> wrote:
On Sep 25, 7:47 pm, Calorie <caloriehad...@xxxxxxxxx> wrote:





On Sep 26, 6:57 am, Igor <thoov...@xxxxxxxxxx> wrote:

On Sep 25, 2:09 am, Calorie <caloriehad...@xxxxxxxxx> wrote:

On Sep 25, 7:54 am, Igor <thoov...@xxxxxxxxxx> wrote:

On Sep 24, 7:35 pm, Calorie <caloriehad...@xxxxxxxxx> wrote:

How much smaller can you compress a particle such as a
quark or electron? Remember that in the Big Bang, trillions and
trillions to the nth power of quarks were compressed into the size
of a single quark. What happens to a particle when it is
compressed?

cal

You don't need to think in terms of compressed particles.  Around the
epoch of the big bang, there was supposedly nothing but an energy
soup.  In that hot, high energy state, particles as we understand them
didn't actually exist.  It was only through the various symmetry
breakings as the universe expanded and cooled that we arrived at the
universe we have today.  One of these symmetries involved particles
and antiparticles, which, after breaking, allowed for more particles
than antiparticles.  That's the main reason we seem to have a universe
dominated by matter rather than antimatter.

What symmetry prevent the particle-antiparticle pairs from
forming in say the grand unification epoch? So what if
the electroweak is still one just being separated from
gravity, a particle should already exist in the vacuum even
before there is inflation. I just want to know what conditions
prevent particles from existing in the vacuum.

No condition prevents them from existing in the vacuum.  Provided that
they obey conservation rules.  That means they pop out of vacuum as
particle-antiparticle pairs and then annihilate as pairs essentially
going back into the vacuum.- Hide quoted text -

- Show quoted text -

Some passage in the following perplexed me:

http://en.wikipedia.org/wiki/Grand_unification_epoch

"The grand unification epoch ended at approximately 10-36 seconds
after the Big Bang. At this point several key events took place. The
strong force separated from the other fundamental forces. The
temperature
fell below the threshold at which X and Y bosons could be created..."

It says "The temperature fell below the threshold at which X and Y
bosons
could be created..."

You know what is the relationship between temperature and the creation
of particle-antiparticle pairs?  

Temperature is directly related to energy, so if it's hot enough
certain particles can be created easily, provided the background
energy is above the particle's mass energy.  Once it cools down and
the background energy falls below the particle's mass energy, particle
production falls off since there is not sufficient energy to bring
them into existence.  It's conservation of energy, pure and simple.

If the temperature is very high, how
would it prevent the particles from existing?

It wouldn't.  But the heavier the particle, the higher the temperature
needs to be to create it.  And the X and Y bosons are hypothesised to
be two of the most extremely massive gauge bosons in nature.

In grand unification, it
is understandable that very high temperature can unite the strong
and electroweak force.. but not clear why high temperature can
prevent fundamental particle (not composite) from existing.. like
the X and Y boson.

Temperatures required to produce the weak bosons are much much lower
than those hypothesized for the X and Y's.- Hide quoted text -

- Show quoted text -

So what symmetry cause the production of the X and Y Boson right
after the grand unification epock, the article says after the
temperature
threshold gets lowered the X and Y Boson are produced. Home
come they can't exist at higher temperature?

cal
.

Relevant Pages

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