192 citations · 1.3k across the 33 of their papers we have counts for
9 papers · 1 filter
Higgs-like spectator field as the origin of structure
Alexandros Karam, Tommi Markkanen, Luca Marzola +3
We show that the observed primordial perturbations can be entirely sourced by a light spectator scalar field with a quartic potential, akin to the Higgs boson, provided that the fi…
Novel mechanism for CMB modulation in the Standard Model
Alexandros Karam, Tommi Markkanen, Luca Marzola +3
We demonstrate that light spectator fields can source sizeable CMB anisotropies through modulated reheating even in the absence of direct couplings to the inflaton. The effect aris…
The 1-loop effective potential for the Standard Model in curved spacetime
Tommi Markkanen, Sami Nurmi, Arttu Rajantie +1
The renormalisation group improved Standard Model effective potential in an arbitrary curved spacetime is computed to one loop order in perturbation theory. The loop corrections ar…
Vacuum Stability in the Early Universe and the Backreaction of Classical Gravity
Tommi Markkanen
In the case of a metastable electroweak vacuum the quantum corrected effective potential plays a crucial role in the potential instability of the Standard Model. In the Early Unive…
Do metric fluctuations affect the Higgs dynamics during inflation?
Tommi Markkanen, Sami Nurmi, Arttu Rajantie
We show that the dynamics of the Higgs field during inflation is not affected by metric fluctuations if the Higgs is an energetically subdominant light spectator. For Standard Mode…
Spacetime curvature and the Higgs stability during and after inflation: Gravity to the rescue?
Tommi Markkanen
We investigate the stability of the electroweak vacuum during and after inflation by taking into account the effects of classical gravity in the quantum dynamics. In particular we…