5 papers
HIP 61637 b: a TESS Brown Dwarf in a Near-circular Orbit around a Massive A-type Star
Nino Ephremidze, David W. Latham, Perry Berlind +8
We present the characterization of HIP 61637 b (TOI-5401 b), a brown dwarf discovered by TESS to transit an A-type star. HIP 61637 is the most massive and the brightest star known…
Statistical imprints of wave-like dark matter on multiply-imaged galaxies in strong cluster lenses from JWST
Nino Ephremidze, Daniel Gilman, Cora Dvorkin
Wave-like dark matter (DM) is an elusive dark matter (DM) candidate. The model, often also called fuzzy or ultralight DM, proposes that DM is an extremely light ($m\sim10^{-22}…
Fast Fourier Transform evaluation of the Fresnel integral for gravitational-wave lensing
Nino Ephremidze, Marc Kamionkowski, Cora Dvorkin
Gravitational waves (GWs) exhibit wave-optics effects when their wavelength is comparable to the scale of the gravitational lens. This may occur in lensing from galactic subhalos i…
Primordial features as probes of baryogenesis from supersymmetric flat directions
Yi-Peng Wu, Xingang Chen, Nino Ephremidze +1
The Affleck-Dine mechanism is a leading baryogenesis scenario in which scalar condensates form coherently during inflation along supersymmetric flat directions that are lifted by s…
Dark Matter Substructure or Source Model Systematics? A Case Study of Cluster Lens Abell S1063
Nino Ephremidze, Chandrika Chandrashekar, Atınç ÃaÄan Åengül +1
Mapping the small-scale structure of the universe through gravitational lensing is a promising tool for probing the particle nature of dark matter. Curved Arc Basis (CAB) has been…