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Mikhail Chapochnikov

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Publications associées (139)

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A new framework for numerical simulations of structure formation

Mikhail Chapochnikov, Claude Becker, Alexey Boyarsky, Oleg Ruchayskiy

The diversity of structures in the Universe (from the smallest galaxies to the largest superclusters) has formed under the pull of gravity from the tiny primordial perturbations that we see imprinted in the cosmic microwave background. A quantitative descr ...

Oxford Univ Press2014

Chiral Asymmetry from a 5D Higgs Mechanism

Mikhail Chapochnikov

An intriguing feature of the Standard Model is that the representations of the unbroken gauge symmetries are vector-like whereas those of the spontaneously broken gauge symmetries are chiral. Here we provide a toy model which shows that a natural explanati ...

Springer Nature2007

Opening a new window for warm dark matter

Mikhail Chapochnikov

We explore the range of parameters for dark-matter sterile neutrinos in an extension of the Minimal Standard Model by three singlet fermions with masses below the electroweak scale (the νMSM). This simple model can explain a wide range of phenomena, includ ...

2006

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

Standard model meets gravity: Electroweak symmetry breaking and inflation

Mikhail Chapochnikov, Andrey Shkerin, Sebastian Zell

We propose a model for combining the Standard Model (SM) with gravity. It relies on a nonminimal coupling of the Higgs field to the Ricci scalar and on the Palatini formulation of gravity. Without introducing any new degrees of freedom in addition to those ...

American Physical Society2021

Anomalous non-conservation of fermion/chiral number in Abelian gauge theories at finite temperature (vol 4, 26, 2018)

Mikhail Chapochnikov, Daniel Garcia Figueroa

To confront the numerical results of Gamma(diff)with the analytical results from section 2.3, we originally considered the theoretical prediction for the diffusion rate given by eq. (2.17), which we re-wrote in eq. (4.25). ...

Springer Nature2020

Spontaneous conformal symmetry breaking in fishnet CFT

Mikhail Chapochnikov, Georgios Karananas

Quantum field theories with exact but spontaneously broken conformal invariance have an intriguing feature: their vacuum energy (cosmological constant) is equal to zero. Up to now, the only known ultraviolet complete theories where conformal symmetry can b ...

2020

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

Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations

Mikhail Chapochnikov, Inar Timiryasov, Juraj Klaric

Right-handed neutrinos offer an elegant solution to two well-established phenomena beyond the Standard Model (SM)-masses and oscillations of neutrinos, as well as the baryon asymmetry of the Universe. It is also a minimalistic solution, since it requires o ...

American Physical Society2021

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

Mikhail Chapochnikov, Matthias Finger, Alexey Boyarsky, Oleg Ruchayskiy

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

Parameter space of baryogenesis in the nu MSM

Mikhail Chapochnikov, Shintaro Eijima, Inar Timiryasov

The Standard Model accompanied with two right-handed neutrinos with masses below the weak scale can explain the observed baryon asymmetry of the Universe. Moreover, this model is at least partially testable in the forthcoming experiments such as NA62, SHiP ...

Springer Nature2019

Inflation, LHC and the Higgs boson

Mikhail Chapochnikov

After the Higgs boson has been discovered, the Standard Model of particle physics became a confirmed theory, potentially valid up to the Planck scale and allowing to trace the evolution of the Universe from inflationary stage till the present days. We disc ...

World Scientific Publ Co Pte Ltd2015

Baryogenesis

Mikhail Chapochnikov

IOP Publishing2009

Primordial magnetic fields

Mikhail Chapochnikov

We discuss here the following questions related to magnetic fields in the early universe: 1. Observational constraints on primordial magnetic fields. 2. Different ideas put forward for explanation of large scale fields which can seed the galactic magnetic ...

2005

Diamagnetic vortices in Chern-Simons theory

Yannis Burnier, Mikhail Chapochnikov, Eray Sabancilar

We find a new type of topological vortex solution in the U(1)(Z) xU(1)(A) Chern-Simons gauge theory in the presence of a U(1)(A) magnetic field background. In this theory U(1)(Z) is broken spontaneously by the U(1)(A) magnetic field. These vortices exhibit ...

American Physical Society2015

Sensitivity of the SHiP experiment to dark photons decaying to a pair of charged particles

Aurelio Bay, Mikhail Chapochnikov, Guido Haefeli, Alexey Boyarsky, Alexandre Emmanuel Grandchamp, Oleg Ruchayskiy, Lesya Shchutska, Nikolaos Charitonidis, Jean-Loup Tastet, Ekaterina Kuznetsova, Inar Timiryasov, Maria Elena Stramaglia, Ana Bárbara Rodrigues Cavalcante, Federico Leo Redi, Elena Graverini

Dark photons are hypothetical massive vector particles that could mix with ordinary photons. The simplest theoretical model is fully characterised by only two parameters: the mass of the dark photon m(gamma)D and its mixing parameter with the photon, epsil ...

2021

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

Sensitivity of the SHiP experiment to Heavy Neutral Leptons

Florian Maria Wurm, Aurelio Bay, Mikhail Chapochnikov, Guido Haefeli, Alexey Boyarsky, Sun Hee Kim, Oleg Ruchayskiy, Nathalie Sophie Adeline Serra, Lesya Shchutska, Adriano Pastore, Nikolaos Charitonidis, Johannes Richard Cornelis Geerit Kruis, Erica Manfredi, Sargis Hakobyan, Eirini Koukovini Platia, Jean-Loup Tastet, Ekaterina Kuznetsova, Inar Timiryasov, Maria Elena Stramaglia, Federico Leo Redi, Elena Graverini

Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses, generate the observed matter-antimatter asymmetry in the Universe an ...

Springer Nature2019

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

Sterile Neutrinos as the Origin of Dark and Baryonic Matter

Mikhail Chapochnikov, Laurent Canetti, Marco Drewes

We demonstrate for the first time that three sterile neutrinos alone can simultaneously explain neutrino oscillations, the observed dark matter, and the baryon asymmetry of the Universe without new physics above the Fermi scale. The key new point of our an ...

Amer Physical Soc2013