Person

Igor Tkachev

This person is no longer with EPFL

Related publications (8)

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A White Paper on keV sterile neutrino Dark Matter

Antoine Pierre Emmanuel Alexis Merle, Alexey Boyarsky, Laurent Gastaldo, Jonathan Leon Wolf, Julien Lesgourgues, Oleg Ruchayskiy, Marco Drewes, Igor Tkachev, Jan Hamann

We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/o ...

Iop Publishing Ltd2017

Universal Properties of Dark Matter Halos

Alexey Boyarsky, Oleg Ruchayskiy, Igor Tkachev

We discuss the universal relation between density and size of observed dark matter halos that was recently shown to hold on a wide range of scales, from dwarf galaxies to galaxy clusters. Predictions of cold dark matter (Lambda CDM) N-body simulations are ...

2010

Quantum scale invariance on the lattice

Igor Tkachev

We propose a scheme leading to a non-perturbative definition of lattice field theories which are scale-invariant on the quantum level. A key idea of the construction is the replacement of the lattice spacing by a propagating dynamical field - the dilaton. ...

2009

The nuMSM, inflation, and dark matter

Igor Tkachev

We show how to enlarge the νMSM (the minimal extension of the Standard Model by three right-handed neutrinos) to incorporate inflation and provide a common source for electroweak symmetry breaking and for right-handed neutrino masses. In addition to inflat ...

2006

How to find a dark matter sterile neutrino?

Alexey Boyarsky, Oleg Ruchayskiy, Igor Tkachev

We propose a strategy for how to look for dark matter particles possessing a radiative decay channel and derive constraints on their parameters from observations of x rays from our own Galaxy and its dwarf satellites. When applied to sterile neutrinos in t ...

2006

Strong CP violation, electroweak baryogenesis and axionic dark matter

Igor Tkachev

We discuss the influence of strong CP-violating effects in invisible-axion models on electroweak baryogenesis. We find that they can be important only if the electroweak phase transition (EPT) occurs simultaneously with the chirality-breaking phase transit ...

1992

PHASE PORTRAIT OF SU(5) MODEL

Igor Tkachev

The one-loop effective potential of the SU(5) model is investigated both in high and low temperature approximation. We find the regions of values of coupling constants and temperatures where the SU(5), the SU(4)×U(1) and the SU(3)×SU(2)×U(1) symmetric stat ...

1982

PHASE PORTRAIT OF SU(5) MODEL. 2. INTERMEDIATE PHASES SU(3) X U(1)2 AND SU(2)2 X U(1)**2

Igor Tkachev

The effective potential of the scalar field in the SU(5) model has extrema with symmetry:SU(5), SU(4)×U(1), SU(3)×SU(2)×U(1), SU(3)×[U(1)]2, [SU(2)]2×[U(1)]2. In our recent paper it was shown that the SU(4)×U(1) phase as well as SU(3)×SU(2)×U(1) phase were ...

1982