64 citations · 254 across the 9 of their papers we have counts for
9 papers
Stop comparing resummation methods
Johan Löfgren
I argue that the consistency of any resummation method can be established if the method follows a power counting derived from a hierarchy of scales. I.e., whether it encodes a top-…
Radiative first-order phase transitions to next-to-next-to-leading order
Andreas Ekstedt, Oliver Gould, Johan Löfgren
We develop new perturbative tools to accurately study radiatively-induced first-order phase transitions. Previous perturbative methods have suffered internal inconsistencies and be…
Nucleation at finite temperature: a gauge-invariant, perturbative framework
Johan Löfgren, Michael J. Ramsey-Musolf, Philipp Schicho +1
We present a gauge-invariant framework for bubble nucleation in theories with radiative symmetry breaking at high temperature. As a procedure, this perturbative framework establish…
Computing the gauge-invariant bubble nucleation rate in finite temperature effective field theory
Joonas Hirvonen, Johan Löfgren, Michael J. Ramsey-Musolf +2
A gauge-invariant framework for computing bubble nucleation rates at finite temperature in the presence of radiative barriers was presented and advocated for model-building and phe…
A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
José Eliel Camargo-Molina, Rikard Enberg, Johan Löfgren
A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, whi…
A Critical Look at the Electroweak Phase Transition
Andreas Ekstedt, Johan Löfgren
The electroweak phase transition broke the electroweak symmetry. Perturbative methods used to calculate observables related to this phase transition suffer from severe problems suc…
On the relationship between gauge dependence and IR divergences in the -expansion of the effective potential
Andreas Ekstedt, Johan Löfgren
Perturbative calculations of the effective potential evaluated at a broken minimum, , are plagued by difficulties. It is hard to get a finite and gauge invariant…
Minimal anomalous theories and collider phenomenology
Andreas Ekstedt, Rikard Enberg, Gunnar Ingelman +2
We study the collider phenomenology of a neutral gauge boson arising in minimal but anomalous extensions of the Standard Model (SM). To retain gauge invariance…
Constraining minimal anomaly free extensions of the Standard Model
Andreas Ekstedt, Rikard Enberg, Gunnar Ingelman +2
We consider a class of minimal anomaly free extensions of the Standard Model with three generations of right-handed neutrinos and a complex scalar. Using electrowea…