Universal properties of Dark Matter halos (2009)
Boyarsky, Alexey, Neronov, Andrey, Ruchayskiy, Oleg, Tkachev, Igor
We discuss the universal relation between density and size of Dark Matter halos.This relation was recently shown to hold on a wide range of scales, from dwarf galaxies to galaxy clusters, both in...
Signatures of a Graviton Mass in the Cosmic Microwave Background (2009)
Dubovsky, Sergei, Flauger, Raphael, Starobinsky, Alexei, Tkachev, Igor
There exist consistent low energy effective field theories describing gravity in the Higgs phase that allow the coexistence of massive gravitons and the conventional 1/r potential of gravity. In an...
Comment on "Correlation of the Highest-Energy Cosmic Rays with Nearby Extragalactic Objects" (2007)
Gorbunov, Dmitry, Tinyakov, Peter, Tkachev, Igor, Troitsky, Sergey
We argue that the data published by the Pierre Auger Collaboration (arXiv:0711.2256) disfavor at 99% confidence level their hypothesis that most of the highest-energy cosmic rays are protons from...
The $\nu$MSM, Inflation, and Dark Matter (2006)
Shaposhnikov, Mikhail, Tkachev, Igor
We show how to enlarge the $\nu$MSM (the minimal extension of the standard model by three right-handed neutrinos) to incorporate inflation and provide a common source for electroweak symmetry...
Dolag, Klaus, Grasso, Dario, Springel, Volker, Tkachev, Igor
We use simulations of LSS formation to study the build-up of magnetic fields (MFs) in the ICM. Our basic assumption is that cosmological MFs grow in a MHD amplification process driven by structure...
Magnetic fields in the local universe and the propagnation of UHECRS (2004)
Dolag, Klaus, Grasso, Dario, Springel, Volker, Tkachev, Igor
Dolag, Klaus, Grasso, Dario, Springel, Volker, Tkachev, Igor
We construct a map of deflections of ultra-high energy cosmic rays by extragalactic magnetic fields using a magneto-hydrodynamical simulation of cosmic structure formation that realistically...
Dynamics of Symmetry Breaking and Tachyonic Preheating (2000)
Felder, Gary, Garcia-Bellido, Juan, Greene, Patrick B., Kofman, Lev, Linde, Andrei, Tkachev, Igor
We reconsider the old problem of the dynamics of spontaneous symmetry breaking using 3d lattice simulations, and develop a theory of tachyonic preheating, which occurs due to the spinodal instability...
LATTICEEASY: A Program for Lattice Simulations of Scalar Fields in an Expanding Universe (2000)
We describe a C++ program that we have written and made available for calculating the evolution of interacting scalar fields in an expanding universe. The program is particularly useful for the study...
Inflation After Preheating (2000)
Felder, Gary, Kofman, Lev, Linde, Andrei, Tkachev, Igor
Preheating after inflation may lead to nonthermal phase transitions with symmetry restoration. These phase transitions may occur even if the total energy density of fluctuations produced during...
What if Dark matter is Bosonic and self-interacting (2000)
Riotto, Antonio, Tkachev, Igor
Recently the problem of singular galactic cores and over-abundant formation of dwarf galaxies, inherent to the standard cold dark matter model, had attracted a great deal of attention. One scenario...