Is Electroweak Symmetry Breaking a Requirement of Universal Law?

In summary: Planck scale.In summary, the law of nature that says electroweak symmetry must be broken is dictated by quantum field theory, specifically the lagrangian of the standard model. It is possible that in other parallel universes, electroweak symmetry is not broken even at lower temperatures similar to ours, and this difference may be due to our luck in having particles like the Higgs that break this symmetry. It is not a requirement for electroweak symmetry to always be broken in all universes. Spacetime symmetry, specifically diffeomorphism and local Lorentz invariance in General Relativity, are not broken in our universe. There are different ways to break these symmetries. The Higgs
  • #1
stglyde
275
0
What law of nature says that electroweak symmetry must be broken? Is it possible that in other parallel Superstrings (or others) universes.. electroweak symmetry were not broken and even after temperature of the Big Bang decreased to what is like ours, electroweak symmetry still existed in that universe? If so. The difference between our universe and it is due to our luck that we have stuff like Higgs or other alternatives that break electroweak symmetry? In other words. Is it a requirement of law of universes that electroweak symmetry must always be broken?

Also do you consider spacetime as a symmetry? Here our spacetime symmetry are not broken, or is it? If not. Then maybe we live in a universe that spacetime symmetry were not broken compared to other universes. What would be it like in a universe where the spacetime symmetry were broken (just wanted to under how to look at electroweak symmetry breaking/non-breaking from all angels)?
 
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  • #2
stglyde said:
What law of nature says that electroweak symmetry must be broken?

Quantum field theory dictates that the existence of massive vector bosons (W and Z particles), discovered in the 1980s in particle accelerators, is only possible with electroweak symmetry breaking.
 
  • #3
stglyde said:
What law of nature says that electroweak symmetry must be broken?
The lagrangian of the standard model.

stglyde said:
Is it possible that in other parallel Superstrings (or others) universes.. electroweak symmetry were not broken and even after temperature of the Big Bang decreased to what is like ours, electroweak symmetry still existed in that universe?
Are you asking whether it's possible to write down a different lagrangian with different symmetry properties? Yes it's possible. You don't need superstrings to do that. Write down the SM lagrangian w/o Higgs.

Afaik it's not possible to strictly derive the SM from any string theory - neither w/ nor w/o Higgs.

stglyde said:
Is it a requirement of law of universes that electroweak symmetry must always be broken?
In our universe in which the SM holds - yes; in other possible universes - no (if you like such speculative ideas ...)

stglyde said:
Here our spacetime symmetry are not broken, or is it?
What do you mean by spacetime symmetry? Diffeomorphism and (locaL) Lorentz invariance in GR? As far as we know these symmetries are not broken.

stglyde said:
What would be it like in a universe where the spacetime symmetry were broken
There are different ways to 'break' these symmetries ...
 
  • #4
tom.stoer said:
The lagrangian of the standard model.


Are you asking whether it's possible to write down a different lagrangian with different symmetry properties? Yes it's possible. You don't need superstrings to do that. Write down the SM lagrangian w/o Higgs.

Afaik it's not possible to strictly derive the SM from any string theory - neither w/ nor w/o Higgs.


In our universe in which the SM holds - yes; in other possible universes - no (if you like such speculative ideas ...)


What do you mean by spacetime symmetry? Diffeomorphism and (locaL) Lorentz invariance in GR? As far as we know these symmetries are not broken.


There are different ways to 'break' these symmetries ...

One can send electromagnetic signal at lightspeed in spacetime.. so can electrons or protons below lightspeed by sending them for example in particle accelerator or cathode tubes. How about the Higgs field. Can't one use it to send higgs signal from say USA to Europe at or below lightspeed? Why not?

In model building in Unified Theories. When one invent a new field (like Higgs field). Must it always follow the law of General Relativity.. meaning no rest frame? But GR is not the final theory because of its incompatibility with QM.

In local lorentz invariance violation experiment. For example. If they found out Planck scale violate lorentz invariance.. meaning there is a nonzero vector field... so I guess one can use this to establish absolute space/time even when apart say between Earth and pluto by treating the Planck scale as the preferred frame? If not. What arguments totally refute this?

Thanks.
 
  • #5
How about the Higgs field. Can't one use it to send higgs signal from say USA to Europe at or below lightspeed? Why not?
The Higgs field is a scalar, and takes on the same value at every point in every rest frame. The Higgs boson is a scalar particle and extremely short-lived, 10-25 or 10-26 sec.
When one invent a new field (like Higgs field). Must it always follow the law of General Relativity.. meaning no rest frame?
No, that's Special Relativity.
For example. If they found out Planck scale violate lorentz invariance.
The Planck scale is simply a combination of physical constants, G, c and ħ. They are all scalars, the same in all rest frames, and there is absolutely no reason to think otherwise.
 
  • #6
Bill_K said:
The Higgs field is a scalar, and takes on the same value at every point in every rest frame. The Higgs boson is a scalar particle and extremely short-lived, 10-25 or 10-26 sec.

No, that's Special Relativity.

The Planck scale is simply a combination of physical constants, G, c and ħ. They are all scalars, the same in all rest frames, and there is absolutely no reason to think otherwise.

But Planck scale may not be that "simply". It is the heart and meat of search for Final Theory. Do you believe time doesn't exist there?

http://discovermagazine.com/2007/jun/in-no-time/article_view?b_start:int=1&-C=

Or do you believe Space doesn't exist in Planck Scale?

http://arxiv.org/abs/0909.1861

Or do you believe Planck contains 11 Spacetime Dimensions as in Superstring Theory?

What do you think is in Planck scale where the equations of quantum mechanics and general relativity break down?
 
  • #7
stglyde said:
What do you think is in Planck scale where the equations of quantum mechanics and general relativity break down?
That's a naive statement.

There are indications that gravity can be quantized non-perturbatively but more or less in a standard way, and that this theory (asymptotic safety) is still well-defined near Planck scale. What breaks down is perturbative quantization of gravity, but we know other examples where this approximation is inadequate (bound states in QCD).

We do not know (yet) how to formulate a theory quantum gravity.
 
  • #8
tom.stoer said:
The lagrangian of the standard model.


Are you asking whether it's possible to write down a different lagrangian with different symmetry properties? Yes it's possible. You don't need superstrings to do that. Write down the SM lagrangian w/o Higgs.

Afaik it's not possible to strictly derive the SM from any string theory - neither w/ nor w/o Higgs.


In our universe in which the SM holds - yes; in other possible universes - no (if you like such speculative ideas ...)


What do you mean by spacetime symmetry? Diffeomorphism and (locaL) Lorentz invariance in GR? As far as we know these symmetries are not broken.


There are different ways to 'break' these symmetries ...

So scalar fields like Higgs and Inflaton field can't be used to "move" in spacetime because they are not vectorial. Beside the following vectorial field:

1. Electromagnetic wave
2. Gravitational wave
3. Weak force wave
4. Strong force wave

Is there any law of physics that says that no other vectorial field can exist?

If not. And if there were another vectorial field not yet discovered in physics. Does it have to be a force like the above fundamental force? It appears all fundamental force are vectorial force. Why can't fundamental force be scalar?
 
  • #9
A scalar field can be used to 'move through spacetime'. The pion field (it's not an elementary particle, but that doesn't matter) is a scalar field. The pion is instable, but has a rather long lifetime such that e.g. pion beams can be generated.

There is no (known) law in physics which determines the elementary fields in the standard model. There is no physical law which forbids adding new forces - the only thing is that we do not observe them. That means that we do not understand WHY we onserve exactly the particles and forces which are described in the SM. We can describe them - fine - but we can't explain their origin.
 
  • #10
tom.stoer said:
A scalar field can be used to 'move through spacetime'. The pion field (it's not an elementary particle, but that doesn't matter) is a scalar field. The pion is instable, but has a rather long lifetime such that e.g. pion beams can be generated.

Earlier in the thread when I asked you "How about the Higgs field. Can't one use it to send higgs signal from say USA to Europe at or below lightspeed? Why not?"

You answered: "The Higgs field is a scalar, and takes on the same value at every point in every rest frame. The Higgs boson is a scalar particle and extremely short-lived, 10-25 or 10-26 sec."

I thought you meant scalar couldn't be used to 'move through spacetime'. But in this message, you said it can. So the higgs boson can be made to move a short distance in the LHC detector, isn't it. But at relativistic speed, it can last thousands of times longer.. so can't one send higgs boson at a distance of say 1 mile?
 
  • #11
stglyde said:
You answered: "The Higgs field is a scalar, and takes on the same value at every point in every rest frame. The Higgs boson is a scalar particle and extremely short-lived, 10-25 or 10-26 sec."
The fact that the Higgs field is a scalar field has nothing to do with the problem of sending messages through space; it only says something regarding it's transformation properties w.r.t. Lorentz transformations. The Higgs particle decays extremely fast, so it's difficult to send signals over macroscopic distances.

stglyde said:
I thought you meant scalar couldn't be used to 'move through spacetime'.
It can. I understand you confusion about the grammar in "... takes on the same value at every point in every rest frame". This does not mean that the field is constant, but that the value of the field at a certain point in space looks the same for all observers (all reference frames). Of course this value can be different at different points in space, and the field can "propagate".

stglyde said:
So the higgs boson can be made to move a short distance in the LHC detector, isn't it.
Yes

stglyde said:
But at relativistic speed, it can last thousands of times longer.. so can't one send higgs boson at a distance of say 1 mile?
It already has relativistic speed a LHC. It has a mass (if it exists ;-) of approx. 100 GeV/c² but is created in collisions of some TeV it's speed could very well be in the range of ~ 100 GeV to ~ TeV, therefore it's already at relativistic speed. But in order to send it over 1 mile its speed and therefore its kinetic energy have to be VERY large (this is a nice exercise in special relativity and time dilation).
 
  • #12
tom.stoer said:
The fact that the Higgs field is a scalar field has nothing to do with the problem of sending messages through space; it only says something regarding it's transformation properties w.r.t. Lorentz transformations. The Higgs particle decays extremely fast, so it's difficult to send signals over macroscopic distances.


It can. I understand you confusion about the grammar in "... takes on the same value at every point in every rest frame". This does not mean that the field is constant, but that the value of the field at a certain point in space looks the same for all observers (all reference frames). Of course this value can be different at different points in space, and the field can "propagate".


Yes


It already has relativistic speed a LHC. It has a mass (if it exists ;-) of approx. 100 GeV/c² but is created in collisions of some TeV it's speed could very well be in the range of ~ 100 GeV to ~ TeV, therefore it's already at relativistic speed. But in order to send it over 1 mile its speed and therefore its kinetic energy have to be VERY large (this is a nice exercise in special relativity and time dilation).

Do you know of other scalar field that can also propagate in space? How does it differ to vectorial field as far as movement is concerned? None? But you said scalar and vector differs only with respect to lorentz transformation.. how? something got to do with polarization or something?
 
  • #13
stglyde said:
Do you know of other scalar field that can also propagate in space?
Pions (I do not now any example of a physical field that does NOT propagate).

stglyde said:
How does it differ to vectorial field as far as movement is concerned?
Different field equations (compare Maxwell equations and Klein-Gordon equation); but for free fields e.g. E² = p² + m² always holds.

stglyde said:
But you said scalar and vector differs only with respect to lorentz transformation.. how?
Have a look at http://en.wikipedia.org/wiki/Lorent...z_transformation_of_the_electromagnetic_field

Example: suppose you are an observer at rest looking at a point like charge at rest. What you see is the radially symmetric, electric Coulomb field; now suppose you move with a certain speed w.r.t. to the same charge.; of course you will still see a charge, but due to Lorentz contraction the field gets deformed; in addition the charge is also moving w.r.t. you - but moving charges create magnetic fields, so you in addition you will see a magnetic field, which is not there in the rest frame of the charge.
 
  • #14
tom.stoer said:
A scalar field can be used to 'move through spacetime'. The pion field (it's not an elementary particle, but that doesn't matter) is a scalar field. The pion is instable, but has a rather long lifetime such that e.g. pion beams can be generated.

There is no (known) law in physics which determines the elementary fields in the standard model. There is no physical law which forbids adding new forces - the only thing is that we do not observe them. That means that we do not understand WHY we onserve exactly the particles and forces which are described in the SM. We can describe them - fine - but we can't explain their origin.

We have narrowed the window for the allowed values of the Higgs boson mass to be 114-141 GeV. Have they taken the Inflaton field and dark energy into consideration? Isn't it that new forces and fields can affect the final masses of the Higgs boson? If not. What other particles or parameters that can be influenced if there are more particles, fields and forces not yet discovered by present physics? We may not be able to detect them.. but if they can affect the masses of higgs or other particles.. then it's one way to detect them indirectly.
 

1. What is electroweak symmetry breaking?

Electroweak symmetry breaking is a fundamental principle in particle physics that explains how the weak nuclear force and electromagnetic force are related. It is the process by which the Higgs field gives mass to the W and Z bosons, which are the carrier particles of the weak nuclear force.

2. Why is electroweak symmetry breaking important?

Electroweak symmetry breaking is important because it helps to unify two of the four fundamental forces of nature (weak nuclear force and electromagnetic force) into a single electroweak force, as described by the Standard Model of particle physics. It also provides a mechanism for particles to acquire mass, which is a crucial aspect of our understanding of the universe.

3. How does the Higgs boson relate to electroweak symmetry breaking?

The Higgs boson is the particle associated with the Higgs field, which is responsible for electroweak symmetry breaking. The Higgs boson was first theorized in the 1960s as part of the Standard Model, and its discovery in 2012 at the Large Hadron Collider confirmed the existence of the Higgs field and its role in giving mass to particles.

4. Are there any alternative theories to explain electroweak symmetry breaking?

While the Standard Model successfully describes electroweak symmetry breaking, there are some alternative theories that attempt to explain this phenomenon. These include supersymmetry, which proposes the existence of additional particles that could help explain the mass of particles, and technicolor, which suggests that electroweak symmetry breaking is a result of a new strong force.

5. How does electroweak symmetry breaking relate to the early universe?

In the early universe, the electroweak force was unified with the strong nuclear force, and particles did not have mass. As the universe cooled and expanded, the Higgs field was activated and electroweak symmetry breaking occurred, separating the electroweak force from the strong nuclear force and giving particles mass. This process is crucial in understanding the evolution of the universe and the formation of matter as we know it.

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