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At the very beginning of the unvierse, the Higgs potential had a paraboloid shape. After the electroweak Symmetry Breaking, it took the mexican hat shape.

Is the analytical dependence of Higgs potential with temperature known ?

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    $\begingroup$ Related: Temperature dependence of the Higgs VEV $\endgroup$ – G. Smith May 28 at 21:20
  • $\begingroup$ Thank you, but the vev is a consequence of the potential, so my question is different. And also, the answer to the other link needs to pay for accessing the document. $\endgroup$ – Mathieu Krisztian May 29 at 7:56
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    $\begingroup$ That paper behind the paywall is the original 1974 Weinberg paper that Simon’s answer mentions. It calculates the temperature corrections to the potential, not just the vev. $\endgroup$ – G. Smith May 29 at 16:19
  • $\begingroup$ @G. Smith : thank you $\endgroup$ – Mathieu Krisztian May 29 at 19:49
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The formalism used to describe the temperature dependence of the Higgs VEV is called a finite temperature effective potential (FTEP).

The temperature contribution to the effective potential was calculated by Weinberg and by Jackiw & Dolan independently in 1974. The FTEP at one-loop order and at high temperature ($T\gg T_c$) looks like $$ V_{\mathrm{T}}(\phi_{\mathrm{cl}})= V_{\mathrm{eff}}(\phi_{\mathrm{cl}}) + \frac{\lambda}{8}T^2\phi_{\mathrm{cl}}^2 - \frac{\pi^2}{90}T^4 + \cdots $$ where $V_{\mathrm{eff}}(\phi_{\mathrm{cl}})$ is the zero-temperature one-loop effective potential (which will have the Mexican hat shape). This means that the additional $ \phi_{\mathrm{cl}}^2$ term due to the temperature contribution will dominate over the original $ \phi_{\mathrm{cl}}^2$ term due to the "mass term" in the Higgs potential. Here is a plot of the FTEP temperature dependence: enter image description here Note that the expression above is only valid for high temperatures, so plotting out that potential will not produce the same figure.

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  • $\begingroup$ A million thanks for your answer $\endgroup$ – Mathieu Krisztian May 29 at 8:12

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