Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Tevzadze, Alexander G."'
Autor:
Brandenburg, Axel, Kahniashvili, Tina, Mandal, Sayan, Pol, Alberto Roper, Tevzadze, Alexander G., Vachaspati, Tanmay
Publikováno v:
Phys. Rev. D 96, 123528 (2017)
We present new simulations of decaying hydromagnetic turbulence for a relativistic equation of state relevant to the early universe. We compare helical and nonhelical cases either with kinetically or magnetically dominated initial fields. Both kineti
Externí odkaz:
http://arxiv.org/abs/1711.03804
Autor:
Brandenburg, Axel, Kahniashvili, Tina, Mandal, Sayan, Pol, Alberto Roper, Tevzadze, Alexander G., Vachaspati, Tanmay
Publikováno v:
Phys. Rev. Fluids 4, 024608 (2019)
We show that in decaying hydromagnetic turbulence with initial kinetic helicity, a weak magnetic field eventually becomes fully helical. The sign of magnetic helicity is opposite to that of the kinetic helicity - regardless of whether or not the init
Externí odkaz:
http://arxiv.org/abs/1710.01628
Publikováno v:
Phys. Rev. E 96, 010901 (2017)
The linear stability of viscous Keplerian flow around a gravitating center is studied using the rheological granular fluid model. The linear rheological instability triggered by the interplay of the shear rheology and Keplerian differential rotation
Externí odkaz:
http://arxiv.org/abs/1702.07271
Publikováno v:
J. Cosmol. Astropart. Phys. 12, 002 (2017)
We consider a scale-invariant helical magnetic field generated during inflation. We show that, if the mean magnetic helicity density of such a field is measured, it can be used to determine a lower bound on the duration of inflation. Upper bounds can
Externí odkaz:
http://arxiv.org/abs/1610.03139
Publikováno v:
Physica Scripta, Volume 91, Issue 10, article id. 104008 (2016)
We study the evolution of primordial magnetic fields in an expanding cosmic plasma. For this purpose we present a comprehensive theoretical model to consider the evolution of MHD turbulence that can be used over a wide range of physical conditions, i
Externí odkaz:
http://arxiv.org/abs/1507.00510
Publikováno v:
Phys. Rev. Lett. 114, 075001 (2015)
In the presence of magnetic helicity, inverse transfer from small to large scales is well known in magnetohydrodynamic (MHD) turbulence and has applications in astrophysics, cosmology, and fusion plasmas. Using high resolution direct numerical simula
Externí odkaz:
http://arxiv.org/abs/1404.2238
We consider the evolution of primordial magnetic fields generated during cosmological, electroweak or QCD, phase transitions. We assume that the magnetic field generation can be described as an injection of magnetic energy to cosmological plasma at a
Externí odkaz:
http://arxiv.org/abs/1212.0596
Autor:
Kahniashvili, Tina, Maravin, Yurii, Natarajan, Aravind, Battaglia, Nicholas, Tevzadze, Alexander G.
We study primordial magnetic field effects on the matter perturbations in the Universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e. during the radiation dominated epoch of the Universe expansion, but do not l
Externí odkaz:
http://arxiv.org/abs/1211.2769
Publikováno v:
Astrophys. J. 759, 54 (2012)
We study the evolution of QCD phase transition-generated magnetic fields in freely decaying MHD turbulence of the expanding Universe. We consider a magnetic field generation model that starts from basic non-perturbative QCD theory and predicts stocha
Externí odkaz:
http://arxiv.org/abs/1207.0751
Autor:
Kahniashvili, Tina, Brandenburg, Axel, Campanelli, Leonardo, Ratra, Bharat, Tevzadze, Alexander G.
We study the evolution of an inflation-generated magnetic field, due to its coupling to fluid motions, during cosmological phase transitions. We find that the magnetic field stays almost unchanged on large scales, while on small scales the spectrum i
Externí odkaz:
http://arxiv.org/abs/1206.2428