Elena Kopteva

Research record

Selected publications

Papers in general relativity, cosmology, cosmological black holes, and semantic dynamics in agent populations.

arXiv author pageORCID

2026

  1. Measuring Collective Semantic Change in Populations of Language Model Agents

    E. Kopteva

    arXiv preprint (2026)

    arXiv

  2. Charged black holes embedded in matter with anisotropic pressure: Horizon Structure and Quasinormal Mode Spectra

    D. N. Garzon, Jiayi Zhang, E. Kopteva, H. Witek

    arXiv preprint (2026)

    arXivINSPIRE

  3. Rater State Bias in RLHF Preference Data: An Audit Framework

    E. Kopteva, V. Hlynianyi-Zhuk

    arXiv preprint (2026)

    arXiv

  4. Isotropic Coordinates for Generalized Schwarzschild-like Solutions

    Z. Zeng, E. Kopteva

    Journal of Mathematical Physics 67(6), 062501 (2026)

    arXivDOIINSPIRE

2023

  1. Virial theorem for a cloud of stars obtained from the Jeans equations with second correlation moments

    A. Stupka, E. Kopteva, M. Saliuk, I. Bormotova

    European Physical Journal C 83(7), 598 (2023)

    arXiv

2021

  1. Geodesic Structure of the Accelerated Stephani Universe

    I. Bormotova, E. Kopteva, Z. Stuchlik

    Symmetry 13(6), 1001 (2021)

    arXiv

2020

  1. Accelerated expansion of the universe from the perspective of inhomogeneous cosmology

    I. Bormotova, E. Kopteva, M. Churilova, Z. Stuchlik

    International Journal of Modern Physics A (2020)

    arXiv

2019

  1. Accelerated Expansion of the Universe in the Model with Non-Uniform Pressure

    E. Kopteva, I. Bormotova, M. Churilova, Z. Stuchlik

    Astrophysical Journal 887, 98 (2019)

    arXiv

2018

  1. Exact Solution for a Black Hole Embedded in a Nonstatic Dust-filled Universe

    E. Kopteva, P. Jaluvkova, I. Bormotova, Z. Stuchlik

    Astrophysical Journal 866, 98 (2018)

    arXiv

2017

  1. The model of the black hole enclosed in dust: the flat space case

    P. Jaluvkova, E. Kopteva, Z. Stuchlik

    General Relativity and Gravitation 49, 80 (2017)

    arXiv

2016

  1. Stefani cosmological models with accelerated expansion

    M. Korkina, O. Iegurnov, E. Kopteva

    Russian Physics Journal 59(3), 328–334 (2016)

  2. Geodesic motion of test particles in Korkina-Grigoryev metric

    I. Bormotova, E. Kopteva

    arXiv preprint (2016)

    arXiv

  3. The generalized Lemaitre-Tolman-Bondi solutions with nonzero pressure in modeling the cosmological black holes

    E. Kopteva, P. Jaluvkova, Z. Stuchlik

    arXiv preprint (2016)

    arXiv

2015

  1. Friedmann cosmological models with various equations of state of matter

    I. Bormotova, E. Kopteva

    Ukrainian Physics Journal (2015)

2012

  1. The mass function method for obtaining exact solutions in General Relativity

    M. Korkina, E. Kopteva

    Space, Time and Fundamental Interactions 1, 38–47 (2012)

    arXiv

2008

  1. T-Models and Kantowski-Sachs Models

    M. Korkina, E. Kopteva, W. Kazemir

    Ukrainian Physics Journal 53(2), 107–111 (2008)

2005

  1. The Friedman Models with the Pressure and the Cosmological Constant

    M. Korkina, E. Kopteva, O. Orlyansky

    Ukrainian Physics Journal 50(1), 11–15 (2005)

Research archives

  1. Kopterix: A Low-Footprint Instrument for Observing Agent-Native Populations, with a Two-Month Validation on Moltbook

    E. Kopteva

    Zenodo (2026)

    DOI