Research Professor, Physics
EducationDr. Sci. Physics, Lebedev Physics Institute, Russia
In the last decade or so, 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 valid from very large scales down to small scales, from today back to the very far past. Cosmological observations planned in the nearest feature will provide even higher quality data, improving our 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 areas include investigation of physical processes in the Universe at very early epochs, as well as late times. In particular, I study (i) fundamental symmetries tests at very high energies (early epochs of the universe expansion) using currently available data of astrophysical, cosmological, and particle physics experiments; (ii) gravitational waves signal from very early universe (inflation, phase transitions); (iii) CMB fluctuations in beyond standard cosmological models. I am interested to consider alternative scenarios to explain accelerated expansion of the universe, such as modifications of general relativity (especially massive gravity models). From astrophysics side I am working on cosmological magnetic fields and the origins, evolution, and observable signatures of primordial turbulence.
- T. Kahniashvili, A. Kar, G. Lavrelashvili, N. Agarwal, L. Heisenberg, and A. Kosowsky, Cosmic expansion in extended quasidilaton massive gravity, Phys. Rev. D 91, 041301(R) (2015)
- Tina Kahniashvili, Yurii Maravin, Aravind Natarajan, Nicholas Battaglia, Alexander G. Tevzadze, Constraining primordial magnetic fields through large-scale structure, The Astrophysical Journal 770, 47 (2013)
- Tina Kahniashvili, Alexander Tevzadze, Axel Brandenburg, Andrii Neronov, Evolution of primordial magnetic fields from phase transitions, Phys. Rev. D 87, 83007 (2013)
- Tina Kahniashvili, Axel Brandenburg, Leonardo Campanelli, Bharat Ratra, Alexander G. Tevzadze, Evolution of inflation-generated magnetic field through phase transitions, Physical Review D 86, 103005 (2012)
- Alexander G. Tevzadze, Leonard Kisslinger, Axel Brandenburg, Tina Kahniashvili, Magnetic fields from QCD phase transitions, The Astrophysical Journal 759, 54 (2012)
- Arthur Kosowsky, Tina Kahniashvili, Signature of Local Motion in the Microwave Sky, Physical Review Letters 106, 191301 (2011)
- Tina Kahniashvili, Alexander G. Tevzadze, Bharat Ratra, Phase transition generated cosmological magnetic field at large scales, The Astrophysical Journal 726, 78 (2011)
- Tina Kahniashvili, Leonard Kisslinger, Trevor Stevens, Gravitational radiation generated by cosmological phase transition magnetic fields, Physical Review D 81, 023004 (2010)
- Tina Kahniashvili, Yurii Maravin, Arthur Kosowsky, Faraday rotation limits on a primordial magnetic field from Wilkinson Microwave Anisotropy Probe five-year data, Physical Review D 80, 023009 (2009)
- Tina Kahniashvili, Ruth Durrer, Yurii Maravin, Testing Lorentz invariance violation with Wilkinson Microwave Anisotropy Probe five year data, Physical Review D 78, 123009 (2008)
- Tina Kahniashvili, George Lavrelashvili, Bharat Ratra, CMB temperature anisotropy from broken spatial isotropy due to a homogeneous cosmological magnetic field, Physical Review D 78, 063012 (2008)
- Tina Kahniashvili, Grigol Gogoberidze, Bharat Ratra, Gravitational Radiation from Primordial Helical Magnetohydrodynamic Turbulence, Physical Review Letters 100, 231301 (2008)