We study the automatic fine-tuning of isospin breaking effects by conformal coalescence found by Howard Georgi in the 2-flavor Schwinger model, i.e. 1+1D QED. Numerical investigation of pion mass splitting on a 1+1 dimensional lattice confirms that the symmetry breaking effects are exponentially suppressed in the fermion mass $m_f$ even for large splittings of $\delta m \approx m_f$. Some...
In a cosmological first-order phase transition, bubbles of true vacuum nucleate and expand due to the difference in vacuum energy. We study non-thermal particle production from the collisions of such bubbles, which can be relevant for many beyond the Standard Model scenarios, such as baryogenesis and dark matter. The bubble collisions result in local excitations of the background scalar field,...
To explain the observed baryon asymmetry of the universe (BAU) in an electroweak baryogenesis (EWBG) scenario, beyond the standard model (BSM) models are required to fulfill the necessary Sakharov conditions, i.e. they need to provide sufficient departure from thermal equilibrium by enabling a strong first-order electroweak phase transition (SFOEWPT), as well as provide a source of additional...
Many popular extensions of the SM require sizeable modifications to the trilinear Higgs boson coupling in order to accommodate a first-order electroweak (EW) phase transition. Cosmological first-order phase transitions can give rise to a primordial gravitational wave (GW) background which could be observable at future space-based GW detectors such as LISA. Focusing on the Yukawa type-II 2HDM...
The Standard Model (SM) of particle physics predicts a minimal Higgs
sector and the existence of one Higgs boson that has already been
discovered at the Large Hadron Collider (LHC). However, nothing
prevents nature from having a non minimal Higgs sector. In
particular, when a set of theoretical and experimental constraints
are taken into account, it is possible to postulate theories beyond
the...
In order to exploit the full potential of the high-precision measurements at LHC new theory predictions are needed. The Higgs boson plays an important role not only in the Standard Model (SM) but also in various BSM models. Thus, precise predictions of its kinematic distributions and of its decay products are crucial to be sensitive to possible deviations from the SM.
Unfortunately, in the...
