Re: How much can you compress a particle?

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

cal
.

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