10 citations · 18 across the 12 of their papers we have counts for
12 papers
Measuring Collective Semantic Change in Populations of Language Model Agents
Elena Kopteva
Collective semantic change in populations of language model agents is a measurable dynamical phenomenon. We present a passive longitudinal instrument called Kopterix that observes…
Charged black holes embedded in matter with anisotropic pressure: Horizon Structure and Quasinormal Mode Spectra
D. N. Garzon, Jiayi Zhang, Elena Kopteva +1
In realistic settings, black holes are expected to be embedded in astrophysical environments. These environments, including possible dark matter distributions, can modify observabl…
Rater State Bias in RLHF Preference Data: An Audit Framework
Elena Kopteva, Vitaliy Hlynianyi-Zhuk
We identify a structured confound in Reinforcement Learning from Human Feedback (RLHF). Pairwise preference labels are intended to reflect the compared outputs, but they may also r…
Isotropic Coordinates for Generalized Schwarzschild-like Solutions
Zeyu Zeng, Elena Kopteva
We consider a broad class of static, spherically symmetric generalized Schwarzschild-like solutions with multiple non-interacting anisotropic fluid sources and derive the coordinat…
Virial theorem for a cloud of stars obtained from Jeans equations with the second correlation moments
Stupka A. A., Kopteva E. M., Saliuk M. A. +1
A hydrodynamic model for small acoustic oscillations in a cloud of stars is built, taking into account the self-consistent gravitational field in equilibrium with a non-zero second…
Geodesic Structure of the Accelerated Stephani Universe
Irina Bormotova, Elena Kopteva, Zdenek Stuchlik
For the spherically symmetric Stephani cosmological model with an accelerated expansion, we investigate the main scenarios of the test particle and photon motion. We show that a co…