Tina Kahniashvili
Associate Research Professor
Astrophysics & Cosmology
Wean Hall 8020
412-268-1818
Education & Professional Experience
American Physical Society, American Astronomical Society
IAU International Astronomical Union
Main Scientist, Abastumani Astrophysical Observatory (Georgia) 2020–
Professor of Physics and Astronomy, Ilia State University (Georgia), 2010–
Visiting Research Professor, Carnegie Mellon University, 2010–2012
Visiting Professor, Carnegie Mellon University, 2009–2010
Adjunct Professor, Laurentian University (Canada), 2008–2021
Associate Professor, Ilia State University (Georgia), 2008–2010
Visiting Professor, Kansas State University, 2007–2008
Research Scientist, CCPP, New York University, 2006–2007
Associate Research Professor, Kansas State University, 2005–2006
Research Associate, Kansas State University, 2003–2005
Leading Staff Scientist, Abastumani Astrophysical Observatory, 2002–2007
Senior Research Scientist, Abastumani Astrophysical Observatory, 1993–2002
Researcher, Abastumani Astrophysical Observatory (Georgia), 1988–1993
Research Interests
In the last decade, high quality cosmological data has greatly improved our understanding of physical processes in the Universe. It seems that cosmology is now in a "golden epoch", with observations of the cosmic microwave background (CMB), large scale structure distribution, gravitational lensing, and other observational data supporting a consistent "standard" model of the universe that may be valid from very large scales down to small scales, from today back to the very far past. Cosmological observations planned in the near future will provide data of even higher quality, improving further our current knowledge of the origin, structure, and evolution of the Universe. On the other hand, High Energy Particle Physics and High Energy Astrophysics are relevant for several issues arising in the cosmology of the early Universe.
My main research includes investigations of physical processes in the Universe at very early epochs as well as at late times. In particular, I study (i) fundamental symmetry tests at very high energies (early epochs of the universe expansion) using available data of astrophysical, cosmological, and particle physics experiments; (ii) gravitational wave signals from the very early universe (inflation, phase transitions); (iii) CMB fluctuations beyond standard cosmological models. I am interested in alternative scenarios to explain the accelerated expansion of the universe, such as modifications of general relativity (especially massive gravity models). From the astrophysics side, I am working on cosmological magnetic fields and the origins, evolution, and observable signatures of primordial turbulence.
Recent Publications
Salome Mtchedlidze et al, Evolution of Primordial Magnetic Fields during Large-scale Structure Formation, The Astrophysical Journal, 929:127, 2022
Kahniashvili, Tina and Clarke, Emma and Stepp, Jonathan and Brandenburg, Axel, Big Bang Nucleosynthesis Limits and Relic Gravitational-Wave Detection Prospects, Phys. Rev. Lett 128 22 (2022)
Alberto Roper Pol et al., Polarization of gravitational waves from helical MHD turbulent sources, JCAP 04 019 (2022)
A. Brandenburg et al., The scalar, vector, and tensor modes in gravitational wave turbulence simulations, Class. Quantum Grav. 38 145002 (2021)
A. Brandenburg, E. Clarke, Y. He, and T. Kahniashvili, Can we observe the QCD phase transition-generated gravitational waves through pulsar timing arrays?, Phys. Rev. D 104, 043513 (2021)
A. Brandenburg, Y. He, T. Kahniashvili, M. Rheinhardt, and J. Schober, Relic Gravitational Waves from the Chiral Magnetic Effect, The Astrophysical Journal, 911, 110 (2021)
A. Brandenburg, G. Gogoberidze, T. Kahniashvili, S. Mandal, A. Roper Pol, Circular polarization of gravitational waves from early-Universe helical turbulence, Phys. Rev. Research 3, 013193 (2021)
A. Brandenburg, R. Durrer, Y. Huang, T. Kahniashvili, S. Mandal, S. Mukohyama, Primordial magnetic helicity evolution with a homogeneous magnetic field from inflation, Phys. Rev. D 102, 023536 (2020)
A. Roper Pol, S. Mandal, A. Brandenburg, T. Kahniashvili, A. Kosowsky, Numerical simulations of gravitational waves from early-universe turbulence, Phys. Rev. D 102, 083512 (2020)
A. Brandenburg, R. Durrer, T. Kahniashvili, S. Mandal, W.W. Yin, Statistical Properties of Scale-Invariant Helical Magnetic Fields and Applications to Cosmology, JCAP 08, 034 (2018)
A. Brandenburg, T. Kahniashvili, S. Mandal, A. Roper Pol, A. Tevzadze, T. Vachaspati, Evolution of Hydromagnetic Turbulence from Electroweak Phase Transitions, Phys. Rev. D 96, 123528 (2017)
T. Kahniashvili, A. Brandenburg, R. Durrer, A. Tevzadze, W. Yin, Scale-invariant helical magnetic field evolution and the duration of inflation, JCAP 12, 002 (2017)
Axel Brandenburg, Tina Kahniashvili, Classes of hydrodynamic and magnetohydrodynamic turbulent decay, Phys. Rev. Lett. 118, 055102 (2017)
More Publications:
ORCID Researcher ID INSPIRES HEP ADS