Mikhail Chapochnikov

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Related publications (139)

The SHiP experiment at the proposed CERN SPS Beam Dump Facility

Lesya Shchutska, Aurelio Bay, Guido Haefeli, Elena Graverini, Mikhail Chapochnikov, Federico Leo Redi, Maria Elena Stramaglia, Inar Timiryasov, Alexandre Emmanuel Grandchamp, Ana Bárbara Rodrigues Cavalcante

The Search for Hidden Particles (SHiP) Collaboration has proposed a general-purpose experimental facility operating in beam-dump mode at the CERN SPS accelerator to search for light, feebly interacting particles. In the baseline configuration, the SHiP exp ...

2022

Scale and Weyl invariance in Einstein-Cartan gravity

Mikhail Chapochnikov, Sebastian Zell

We show how Einstein-Cartan gravity can accommodate both global scale and local scale (Weyl) invariance. To this end, we construct a wide class of models with nonpropagating torsion and a nonminimally coupled scalar field. In phenomenological applications ...

American Physical Society2021

Einstein-Cartan Portal to Dark Matter

Mikhail Chapochnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell

It is well known since the works of Utiyama and Kibble that the gravitational force can be obtained by gauging the Poincare group, which puts gravity on the same footing as the standard model fields. The resulting theory-Einstein-Cartan gravity-inevitably ...

AMER PHYSICAL SOC2021

Sensitivity of the SHiP experiment to light dark matter

Dark matter is a well-established theoretical addition to the Standard Model supported by many observations in modern astrophysics and cosmology. In this context, the existence of weakly interacting massive particles represents an appealing solution to the ...

Springer Nature2021

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

Uniting Low-Scale Leptogenesis Mechanisms

Mikhail Chapochnikov, Inar Timiryasov, Juraj Klaric

In this Letter we demonstrate that what was previously considered as different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos with masses far below the Grand Unified Theory scale-leptogenesis via neutrino oscillatio ...

AMER PHYSICAL SOC2021

Einstein-Cartan gravity, matter, and scale-invariant generalization (vol 10, 177, 2020)

Mikhail Chapochnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell

Springer Nature2021

Higgs inflation in Einstein-Cartan gravity

Mikhail Chapochnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell

We study inflation driven by the Higgs field in the Einstein-Cartan formulation of gravity. In this theory, the presence of the Holst and Nieh-Yan terms with the Higgs field non-minimally coupled to them leads to three additional coupling constants. For a ...

IOP PUBLISHING LTD2021

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

Lesya Shchutska, Aurelio Bay, Guido Haefeli, Elena Graverini, Mikhail Chapochnikov, Alexey Boyarsky, Federico Leo Redi, Maria Elena Stramaglia, Inar Timiryasov, Alexandre Emmanuel Grandchamp

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

Higgs inflation in Einstein-Cartan gravity (vol 02, 008, 2021)

Mikhail Chapochnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell

IOP Publishing Ltd2021

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