123 citations · 659 across the 33 of their papers we have counts for
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A non-compact QCD axion
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
We investigate the cosmology of an axion that is fundamentally non-compact. During inflation, fluctuations of the effectively massless field populate many QCD vacua, thereby evadin…
Higgs inflation in Weyl-invariant Einstein-Cartan gravity
Georgios K. Karananas, Mikhail Shaposhnikov
In this short note we analyze the inflationary dynamics in Weyl-invariant Einstein-Cartan gravity coupled to the Standard Model of particle physics. We take the axion-like particle…
On the Gravitational Origin of the QCD Axion
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
Gravity can give rise to (pseudo)scalar fields, for instance due to torsion. In particular, axions of gravitational origin have been proposed as a minimal and compelling solution t…
The particle spectra of parity-violating theories: A less radical approach and an upgrade of PSALTer
Will Barker, Georgios K. Karananas, Haochen Tu
Due to computational barriers, the effects of parity violation have so far been grossly neglected in gravitational model-building, leading to a serious gap in the space of prior mo…
Geometrical origin of inflation in Weyl-invariant Einstein-Cartan gravity
Georgios K. Karananas
It is shown that the scalar degree of freedom built-in in the quadratic Weyl-invariant Einstein-Cartan gravity can drive inflation and with predictions in excellent agreement with…