Carnegie Mellon University

Tina Kahniashvili

Associate Research Professor

Astrophysics & Cosmology
Wean Hall 8313


Prof. Tina Kahniashvili

Education & Professional Experience

PhD: Russian Academy of Sciences (1988)
Habilitation: Lebedev Institute of Physics (Russia), Physics & Mathematical Scienes (2000)

Professional Societies:
American Physical Society, American Astronomical Society

Curriculum ViTAE

Associate Research Professor, Carnegie Mellon University, 2013–
Professor of Physics and Astronomy, Ilia State University (Georgia), 2010–
Visiting Research Professor, Carnegie Mellon University, 2010–12
Visiting Professor, Carnegie Mellon University, 2009–10
Adjunct Professor, Laurentian University (Canada), 2008–
Associate Professor, Ilia State University (Georgia), 2008–10
Visiting Professor, Kansas State University, 2007–08
Research Scientist, CCPP, New York University, 2006–07
Associate Research Professor, Kansas State University, 2005–06
Research Associate, Kansas State University, 2003–05
Leading Staff Scientist, Abastumani Astrophysical Observatory, 2002–07
Senior Research Scientist, Abastumani Astrophysical Observatory, 1993–2002
Researcher, Abastumani Astrophysical Observatory (Georgia), 1988–93

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.

Selected Publications

A. Brandenburg, T. Kahniashvili, S. Mandal, A. Roper Pol, A. Tevzadze, T. Vachaspati, Evolution of Hydromagnetic Turbulence from Electroweak Phase Transitions, Physical Review 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, Journal of Cosmology and Astroparticle Physics 1712, 002 (2017)

Axel Brandenburg, Tina Kahniashvili, Classes of hydrodynamic and magnetohydrodynamic turbulent decayPhysical Review Letters 118, 055102 (2017)

A. Brandenburg, J. Schober, I. Rogachvski, T. Kahniashvili, et al. The Turbulent Chiral Magnetic Cascade in the Early Universe, The Astrophysical Journal Letters, 845, no. 2, L21 (2017)

Axel Brandenburg, Tina Kahniashvili, Alexander G. Tevzadze, Nonhelical inverse transfer of a decaying turbulent magnetic fieldPhysical Review Letters 114, 75001 (2015)

Leonard Kisslinger, Tina Kahniashvili, Polarized gravitational waves from cosmological phase transitionsPhys. Rev. D 92, 43006 (2015)

Tina Kahniashvili, Yurii Maravin, George Lavrelashvili, Arthur Kosowsky, Primordial magnetic helicity constraints from WMAP nine-year dataPhys. Rev. D 90, 83004 (2014) 

Tina Kahniashvili, Alexander Tevzadze, Axel Brandenburg, Andrii Neronov, Evolution of primordial magnetic fields from phase transitionsPhys. Rev. D 87, 83007 (2013) 

Tina Kahniashvili, Axel Brandenburg, Leonardo Campanelli, Bharat Ratra, Alexander G. Tevzadze, Evolution of inflation-generated magnetic field through phase transitionsPhysical Review D 86, 103005 (2012)

Arthur Kosowsky, Tina Kahniashvili, Signature of Local Motion in the Microwave SkyPhysical Review Letters 106, 191301 (2011)

Gennady Y. Chitov, Tyler August, Aravind Natarajan, Tina Kahniashvili, Mass varying neutrinos, quintessence, and the accelerating expansion of the UniversePhysical Review D 83, 045033 (2011)

Tina Kahniashvili, Alexander G. Tevzadze, Bharat Ratra, Phase transition generated cosmological magnetic field at large scalesThe Astrophysical Journal 726, 78 (2011)

Tina Kahniashvili, Leonard Kisslinger, Trevor Stevens, Gravitational radiation generated by cosmological phase transition magnetic fieldsPhysical Review D 81, 023004 (2010)

Tina Kahniashvili, Ruth Durrer, Yurii Maravin, Testing Lorentz invariance violation with Wilkinson Microwave Anisotropy Probe five year dataPhysical Review D 78, 123009 (2008)

Tina Kahniashvili, George Lavrelashvili, Bharat Ratra, CMB temperature anisotropy from broken spatial isotropy due to a homogeneous cosmological magnetic fieldPhysical Review D 78, 063012 (2008)

Tina Kahniashvili, Grigol Gogoberidze, Bharat Ratra, Gravitational Radiation from Primordial Helical Magnetohydrodynamic TurbulencePhysical Review Letters 100, 231301 (2008)

More Publications: