160 citations · 407 across the 11 of their papers we have counts for
11 papers
A universal constraint on axion non-Abelian dynamics during inflation
Ema Dimastrogiovanni, Matteo Fasiello, Martino Michelotti +1
Inflationary models equipped with Chern-Simons coupling between their axion and gauge sectors exhibit an array of interesting signals including a testable chiral gravitational wave…
Scale-dependent chirality as a smoking gun for Abelian gauge fields during inflation
Ogan Özsoy, Alexandros Papageorgiou, Matteo Fasiello
Axion-inflation models are a compelling candidate as a mechanism behind the accelerated expansion in the early universe in light of the possibility to embed them in higher dimensio…
Vector dark matter, inflation and non-minimal couplings with gravity
Ogan Özsoy, Gianmassimo Tasinato
We propose a cosmological dark matter production mechanism in the form of a longitudinal massive vector boson. We build upon the work of Graham et.al. including non-minimal couplin…
Inflation and Primordial Black Holes
Ogan Özsoy, Gianmassimo Tasinato
We review conceptual aspects of inflationary scenarios able to produce primordial black holes, by amplifying the size of curvature fluctuations to the level required for triggering…
New constraints on axion-gauge field dynamics during inflation from and BICEP/Keck data sets
Paolo Campeti, Ogan Özsoy, Ippei Obata +1
We present new constraints on spectator axion- gauge field interactions during inflation using the latest (PR4) and BICEP/Keck 2018 data releases. This model c…
Consistency conditions and primordial black holes in single field inflation
Ogan Özsoy, Gianmassimo Tasinato
We discuss new consistency relations for single field models of inflation capable of generating primordial black holes (PBH), and their observational implications for CMB -space…
Toward an Effective Field Theory Approach to Reheating
Ogan Ozsoy, John T. Giblin, Eva Nesbit +2
We investigate whether Effective Field Theory (EFT) approaches, which have been useful in examining inflation and dark energy, can also be used to establish a systematic approach t…
A Model Independent Approach to (p)Reheating
Ogan Özsoy, Gizem Sengor, Kuver Sinha +1
In this note we propose a model independent framework for inflationary (p)reheating. Our approach is analogous to the Effective Field Theory of Inflation, however here the inflaton…
How Well Can We Really Determine the Scale of Inflation?
Ogan Özsoy, Kuver Sinha, Scott Watson
A detection of primordial B-modes has been heralded not only as a smoking gun for the existence of inflation, but also as a way to establish the scale at which inflation took place…
Non-thermal Histories and Implications for Structure Formation
JiJi Fan, Ogan Ozsoy, Scott Watson
We examine the evolution of cosmological perturbations in a non-thermal post-inflationary history with a late-time matter domination period prior to BBN. Such a cosmology could ari…
Heavy Gravitino and Split SUSY in the Light of BICEP2
JiJi Fan, Bithika Jain, Ogan Ozsoy
High-scale supersymmetry (SUSY) with a split spectrum has become increasingly interesting given the current experimental results. A SUSY scale above the weak scale could be natural…