Research Interests
I am a researcher in theoretical cosmology at Tel Aviv University. My work has covered a range of topics in cosmic microwave background (CMB) physics, CMB polarization, Sunyaev-Zel'dovich physics, galaxy clusters, cosmological parameter estimation, and observational systematics. I have also been involved in several CMB-related projects, including POLARBEAR, CMBPol, EPIC, and the Simons Observatory.
My earlier work focused mainly on primary and secondary CMB anisotropies, including polarization systematics, gravitational lensing of the CMB, cluster-induced CMB signals, the Sunyaev-Zel'dovich effect, cosmological birefringence, neutrino-mass constraints, and possible biases in the extraction of cosmological parameters.
In recent years, my research has shifted toward more foundational questions in cosmology and gravitation. I have been exploring Weyl-invariant and locally scale-invariant extensions of general relativity, their possible implications for dark matter phenomenology, the Hubble tension, cosmic coincidence, spatial curvature, and the interpretation of cosmological observables.
More broadly, I am interested in whether some of the standard components of the cosmological model — including dark matter, dark energy, spatial curvature, and cosmic expansion history — may admit alternative theoretical interpretations. My current work also addresses fine-tuning, the role of spatial curvature in Friedmann-Robertson-Walker cosmology, nonstandard cosmological dynamics, and possible reformulations of the relation between observation and cosmological inference.
The common theme of my research is the use of cosmological observations, especially CMB and large-scale-structure data, not only to estimate model parameters, but also to test the theoretical assumptions underlying the standard cosmological framework.
