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Mikhail Chapochnikov

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Publications associées (139)

Search for GeV-Scale Sterile Neutrinos Responsible for Active Neutrino Oscillations and Baryon Asymmetry of the Universe

Mikhail Chapochnikov

Standard Model fails to explain neutrino oscillations, dark matter, and baryon asymmetry of the Universe. All these problems can be solved with three sterile neutrinos added to SM. Quite remarkably, if sterile neutrino masses are well below the electroweak ...

Hindawi Publishing Corporation2012

Higgs boson mass and new physics

Mikhail Chapochnikov

We discuss the lower Higgs boson mass bounds which come from the absolute stability of the Standard Model (SM) vacuum and from the Higgs inflation, as well as the prediction of the Higgs boson mass coming from the asymptotic safety of the SM. We account fo ...

Springer Nature2012

Higgs-Dilaton cosmology: Are there extra relativistic species?

Mikhail Chapochnikov, Javier Rubio

Recent analyses of cosmological data suggest the presence of an extra relativistic component beyond the Standard Model content. The Higgs-Dilaton cosmological model predicts the existence of a massless particle - the dilaton - associated with the spontaneo ...

Elsevier Science Bv2012

ORIGIN: metal creation and evolution from the cosmic dawn

Mikhail Chapochnikov, Alexey Boyarsky, Oleg Ruchayskiy, Douglas Cameron Watson, Simone Campana

ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using high-spectral resolution in the soft X-ray band, ORIGIN will be able to identify the physical conditions of all abundant elements ...

Springer2012

Long-Range Magnetic Fields in the Ground State of the Standard Model Plasma

Mikhail Chapochnikov, Alexey Boyarsky, Oleg Ruchayskiy

In thermal equilibrium the ground state of the plasma of Standard Model particles is determined by temperature and exactly conserved combinations of baryon and lepton numbers. We show that at nonzero values of the global charges a translation invariant and ...

American Physical Society2012

Matter and antimatter in the universe

Mikhail Chapochnikov, Laurent Canetti, Marco Drewes

We review observational evidence for a matter-antimatter asymmetry in the early universe, which leads to the remnant matter density we observe today. We also discuss bounds on the presence of antimatter in the present-day universe, including the possibilit ...

Iop Publishing Ltd2012

Higgs inflation: consistency and generalisations

Mikhail Chapochnikov, Amaury Magnin, Sergey Sibiryakov

We analyse the self-consistency of inflation in the Standard Model, where the Higgs field has a large non-minimal coupling to gravity. We determine the domain of energies in which this model represents a valid effective field theory as a function of the ba ...

Springer Nature2011

Scale-invariant alternatives to general relativity

Mikhail Chapochnikov, Daniel Zenhäusern, Diego Blas Temino

We study the general class of gravitational field theories constructed on the basis of scale invariance (and therefore absence of any mass parameters) and invariance under transverse diffeomorphisms, which are the 4-volume conserving coordinate transformat ...

American Physical Society2011

Late and early time phenomenology of Higgs-dependent cutoff

Mikhail Chapochnikov

The analysis of theories with non-minimal coupling of Higgs field to gravity revealed that they enter into strong coupling regime above certain Higgs-dependent cutoff, which may be considerably below the Planck scale. Assuming that the effective theory, co ...

2011

Higgs-dilaton cosmology: From the early to the late Universe

Mikhail Chapochnikov, Daniel Zenhäusern, Javier Rubio

We consider a minimal scale-invariant extension of the standard model of particle physics combined with unimodular gravity formulated in [M. Shaposhnikov and D. Zenhausern, Phys. Lett. B 671, 187 (2009).]. This theory is able to describe not only an inflat ...

American Physical Society2011

Baryon asymmetry of the Universe without Boltzmann or Kadanoff-Baym equations

Mikhail Chapochnikov, Jean-Sébastien Gagnon

We present a formalism that allows the computation of the baryon asymmetry of the Universe, from the first principles of statistical physics and quantum field theory, that is applicable to certain types of physics beyond the standard model (such as the neu ...

American Physical Society2011

Asymptotic safety of gravity and the Higgs boson mass

Mikhail Chapochnikov

There are indications that gravity is asymptotically safe. The Standard Model (SM) plus gravity could be valid up to arbitrarily high energies. Supposing that this is indeed the case and assuming that there are no intermediate energy scales between the Fer ...

2010

Resonant production of the sterile neutrino dark matter and fine-tunings in the neutrino minimal standard model

Mikhail Chapochnikov, Ananda Roy

The generation of lepton asymmetry below the electroweak scale has a considerable impact on production of dark matter sterile neutrinos. Oscillations or decays of the heavier sterile neutrinos in the neutrino minimal standard model can give rise to the req ...

American Physical Society2010

EDGE: Explorer of diffuse emission and gamma-ray burst explosions

Mikhail Chapochnikov, Matthias Finger, Alexey Boyarsky, Oleg Ruchayskiy, Simone Campana

How structures of various scales formed and evolved from the early Universe up to present time is a fundamental question of astrophysical cosmology. EDGE (Piro et al., 2007) will trace the cosmic history of the baryons from the early generations of massive ...

2009

Standard Model Higgs boson mass from inflation: two loop analysis

Mikhail Chapochnikov

We extend the analysis of [1] of the Standard Model Higgs inflation accounting for two-loop radiative corrections to the effective potential. As was expected, higher loop effects result in some modification of the interval for allowed Higgs masses mmin < m ...

2009

Quantum scale invariance on the lattice

Mikhail Chapochnikov, 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

Baryogenesis

Mikhail Chapochnikov

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2009

Baryon asymmetry of the universe and neutrinos

Mikhail Chapochnikov

Our Universe is charge-asymmetric: it contains no antimatter in amounts comparable to matter. This fact provides cosmological evidence for the nonconservation of baryon number as well as for C and CP breaking. We review the problem of the matter-antimatter ...

2009

SEWDarkM

Mikhail Chapochnikov

A number of observed phenomena in high energy physics and cosmology lack their resolution within the Standard Model of particle physics. These puzzles include neutrino oscillations, baryon asymmetry of the Universe, existence of Dark Matter and inflation. ...

2009

Scale invariance, unimodular gravity and dark energy

Mikhail Chapochnikov, Daniel Zenhäusern

We demonstrate that the combination of the ideas of unimodular gravity, scale invariance, and the existence of an exactly massless dilaton leads to the evolution of the universe supported by present observations: inflation in the past, followed by the radi ...

2009

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