scholarly journals Nonequilibrium effective field theory for absorbing state phase transitions in driven open quantum spin systems

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
Michael Buchhold ◽  
Benjamin Everest ◽  
Matteo Marcuzzi ◽  
Igor Lesanovsky ◽  
Sebastian Diehl
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
Effective Field Theory ◽  
Effective Field ◽  
Quantum Spin ◽  
Spin Systems ◽  
Quantum Spin Systems ◽  
Open Quantum ◽  
Absorbing State

scholarly journals Cosmological phase transitions: is effective field theory just a toy?

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Marieke Postma ◽  
Graham White
Keyword(s):  
Field Theory ◽  
Phase Transition ◽  
Phase Transitions ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
Tree Level ◽  
Dark Sector ◽  
First Order ◽  
First Order Phase

Abstract To obtain a first order phase transition requires large new physics corrections to the Standard Model (SM) Higgs potential. This implies that the scale of new physics is relatively low, raising the question whether an effective field theory (EFT) description can be used to analyse the phase transition in a (nearly) model-independent way. We show analytically and numerically that first order phase transitions in perturbative extensions of the SM cannot be described by the SM-EFT. The exception are Higgs-singlet extension with tree-level matching; but even in this case the SM-EFT can only capture part of the full parameter space, and if truncated at dim-6 operators, the description is at most qualitative. We also comment on the applicability of EFT techniques to dark sector phase transitions.

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