We study the evolution of magnetic fields in freely decaying magnetohydrodynamic turbulence. By quasilinearizing the Navier-Stokes equation, we solve analytically the induction equation in theâ€¦ (More)

We analyze the decay laws of the kinetic and magnetic energies and the evolution of correlation lengths in freely decaying incompressible magnetohydrodynamic (MHD) turbulence. Scale invariance of MHDâ€¦ (More)

The recent 3 yr Wilkinson Microwave Anisotropy Probe data have confirmed the anomaly concerning the low quadrupole amplitude compared to the best-fit Lambda-cold dark matter prediction. We show thatâ€¦ (More)

Recent Wilkinson Microwave Anisotropy Probe (WMAP) data confirm the Cosmic Microwave Background (CMB) quadrupole anomaly. We further elaborate our previous proposal that the quadrupole power can beâ€¦ (More)

The gravitational field produced by a domain wall acts as a medium with spacetime-dependent permittivity Îµ. Therefore, the fine structure constant Î± = e 2 /4Ï€Îµ will be a time-dependent function atâ€¦ (More)

We discuss a new mechanism which allows domain walls produced during the primordial electroweak phase transition. We show that the effective surface tension of these domain walls can be madeâ€¦ (More)

Measurements of the Faraday rotation of the cosmic microwave background radiation (CMBR) polarization could provide evidence for the existence of primordial magnetic fields. The Faraday rotationâ€¦ (More)

Tina Kahniashvili,* Axel Brandenburg, Leonardo Campanelli, Bharat Ratra, and Alexander G. Tevzadze8,k Department of Physics and The McWilliams Center for Cosmology, Carnegie Mellon University, 5000â€¦ (More)

We investigate the effects of an external magnetic helicity production on the evolution of the cosmic axion field. It is shown that a helicity larger than (few x 10(-15) G)2 Mpc, if produced atâ€¦ (More)