107 citations · 347 across the 11 of their papers we have counts for
11 papers
Testing Exotic Electron-Electron Interactions with the Helium Ionization-Energy Anomaly
Lei Cong, Filip Ficek, Rinat Abdullin +2
Precision atomic spectroscopy provides a sensitive probe of physics beyond the Standard Model. A recently reported theory-experiment discrepancy in the ionization energy of me…
Searching for Exotic Interactions between Antimatter
Lei Cong, Filip Ficek, Pavel Fadeev +2
We show that atomic antimatter spectroscopy can be used to search for new bosons that carry spin-dependent exotic forces between antifermions. A comparison of a recent precise meas…
Spin-dependent exotic interactions
Lei Cong, Wei Ji, Pavel Fadeev +8
Novel interactions beyond the four known fundamental forces in nature (electromagnetic, gravitational, strong and weak interactions), may arise due to "new physics" beyond the stan…
Improved constraints on exotic interactions between electron and proton in hydrogen
Lei Cong, Filip Ficek, Pavel Fadeev +1
Atomic spectroscopy can be used to search for new bosons that carry exotic forces between elementary fermions. A comparison of a recent precise measurement [Bullis \textit{et al.},…
Quasinormal modes of Reissner-Nordström-AdS: the approach to extremality
Filip Ficek, Claude Warnick
We consider the quasinormal spectrum of scalar and axial perturbations of the Reissner-Nordström-AdS black hole as the horizon approaches extremality. By considering a foliation of…
Constraints on Spin-Spin-Velocity-Dependent Interaction
Wei Ji, Weipeng Li, Pavel Fadeev +5
The existence of exotic spin-dependent forces may shine light on new physics beyond the Standard Model. We utilize two iron shielded SmCo electron-spin sources and two opticall…
Pseudovector and pseudoscalar spin-dependent interactions in atoms
Pavel Fadeev, Filip Ficek, Mikhail G. Kozlov +2
Hitherto unknown elementary particles can be searched for with atomic spectroscopy. We conduct such a search using a potential that results from the longitudinal polarization of a…
Revisiting spin-dependent forces mediated by new bosons: Potentials in the coordinate-space representation for macroscopic- and atomic-scale experiments
Pavel Fadeev, Yevgeny V. Stadnik, Filip Ficek +3
The exchange of spin-0 or spin-1 bosons between fermions or spin-polarised macroscopic objects gives rise to various spin-dependent potentials. We derive the coordinate-space non-r…
Constraining exotic interactions
Filip Ficek, Dmitry Budker
Beyond-the-standard-model interactions mediated by an exchange of virtual "new" bosons result in a finite set of possible effective interaction potentials between standard-model pa…
Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy
Filip Ficek, Pavel Fadeev, Victor V. Flambaum +4
Heretofore undiscovered spin-0 or spin-1 bosons can mediate exotic spin-dependent interactions between standard-model particles. Here we carry out the first search for semileptonic…
Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy
Filip Ficek, Derek F. Jackson Kimball, Mikhail Kozlov +3
Agreement between theoretical calculations of atomic structure and spectroscopic measurements is used to constrain possible contribution of exotic spin-dependent interactions betwe…