# Energy of massless particles before electroweak symmetry breaking

• I
• Ranku
In summary: So, in summary, the energy of massless particles before electroweak symmetry breaking can be represented as ##E = cp##, just like with photons post-symmetry breaking. However, after symmetry breaking, if a particle gains mass, the energy equation would need to be modified to include the renormalized mass.
Ranku
Would it be correct to represent the energy of massless particles before electroweak symmetry breaking as ##E = cp##, just as we do with photons post-symmetry breaking?

Well, I'm not quite sure, and I'm not an expert, but I would say no. Because this equation is a kinematic equation, therefore it should not care about the dynamic process that gives mass to the particles. In the same way that even after SSB, if a particle acquires a mass ##m_0## is still not correct to write ##E=\sqrt{p^2+m_0^2}##, but rather you need the renormalized mass.

Ranku said:
Would it be correct to represent the energy of massless particles before electroweak symmetry breaking as ##E = cp##, just as we do with photons post-symmetry breaking?

Massless means ##E = cp##, so yes.

Gaussian97 said:
this equation is a kinematic equation, therefore it should not care about the dynamic process that gives mass to the particles

It's a kinematic equation describing massless particles. If a particle gains mass by a dynamic process, it's not massless any more and no longer satisfies a kinematic equation for massless particles. But if that dynamic process hasn't happened yet, and the particle is still massless, it obeys the massless kinematic equation.

Gaussian97 said:
even after SSB, if a particle acquires a mass ##m_0## is still not correct to write ##E=\sqrt{p^2+m_0^2}##, but rather you need the renormalized mass

Yes, you would write ##E = \sqrt{p^2 + m_r^2}##, where ##m_r## is the renormalized mass. But this has nothing to do with what kinematic equation you would write before symmetry breaking, when the particle is still massless.

Ranku

## 1. What are massless particles?

Massless particles are particles that have no rest mass, meaning they have no physical weight or mass at rest. They only have energy and momentum.

## 2. What is electroweak symmetry breaking?

Electroweak symmetry breaking is a phenomenon that occurs in particle physics where the electroweak force, which unifies the electromagnetic and weak nuclear forces, breaks into two separate forces at high energies.

## 3. How does electroweak symmetry breaking affect massless particles?

Before electroweak symmetry breaking, all particles are massless and have no physical weight. However, after the breaking, some particles acquire mass through interactions with the Higgs field, while others remain massless.

## 4. What is the energy of massless particles before electroweak symmetry breaking?

The energy of massless particles before electroweak symmetry breaking is equivalent to their momentum, as they have no rest mass. This energy is constantly changing and can be affected by interactions with other particles or fields.

## 5. How does the energy of massless particles change after electroweak symmetry breaking?

After electroweak symmetry breaking, some particles acquire mass and therefore have a fixed energy, while others remain massless and continue to have energy equivalent to their momentum. However, the interactions between particles and fields can still affect the energy of all particles, including massless ones.

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