192 citations · 1.3k across the 33 of their papers we have counts for
5 papers · 1 filter
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…
Scalar correlation functions in de Sitter space from the stochastic spectral expansion
Tommi Markkanen, Arttu Rajantie, Stephen Stopyra +1
We consider light scalar fields during inflation and show how the stochastic spectral expansion method can be used to calculate two-point correlation functions of an arbitrary loca…
Renormalisation group improvement in the stochastic formalism
Robert J. Hardwick, Tommi Markkanen, Sami Nurmi
We investigate compatibility between the stochastic infrared (IR) resummation of light test fields on inflationary spacetimes and renormalisation group running of the ultra-violet…
Primordial Black Holes from Thermal Inflation
Konstantinos Dimopoulos, Tommi Markkanen, Antonio Racioppi +1
We present a novel mechanism for the production of primordial black holes (PBHs). The mechanism is based on a period of thermal inflation followed by fast-roll inflation due to tac…
Spectator Dark Matter
Tommi Markkanen, Arttu Rajantie, Tommi Tenkanen
The observed dark matter abundance in the Universe can be fully accounted for by a minimally coupled spectator scalar field that was light during inflation and has sufficiently str…