192 citations · 1.3k across the 33 of their papers we have counts for
34 papers
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…
Vacuum decay constraints on the Higgs curvature coupling from inflation
Andreas Mantziris, Tommi Markkanen, Arttu Rajantie
We derive lower bounds for the Higgs-curvature coupling from vacuum stability during inflation in three inflationary models: quadratic and quartic chaotic inflation, and Starobinsk…
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…
Primordial dark matter from curvature induced symmetry breaking
Laura Laulumaa, Tommi Markkanen, Sami Nurmi
We demonstrate that adiabatic dark matter can be generated by gravity induced symmetry breaking during inflation. We study a symmetric scalar singlet that couples to other fi…
Scalar correlation functions for a double-well potential in de Sitter space
Tommi Markkanen, Arttu Rajantie
We use the spectral representation of the stochastic Starobinsky-Yokoyama approach to compute correlation functions in de Sitter space for a scalar field with a symmetric or asymme…
Dark energy without fine tuning
José Eliel Camargo-Molina, Tommi Markkanen, Pat Scott
We present a two-field model that realises inflation and the observed density of dark energy today, whilst solving the fine-tuning problems inherent in quintessence models. One fie…