Dmitry Kobyakov,
researcher, Institute of Applied Physics of Russian Academy of Sciences

Higher education:
2009 MSc, N. I. Lobachevsky State University of Nizhny Novgorod, Radiophysics
2014 PhD, Umeå University, Umeå Sweden. Thesis “Hydrodynamics of binary Bose-Einstein condensates and hydroelasticity of the inner crust of neutron stars”, Supervisors Prof. V. Bychkov, Doc. E. Lundh, Prof. M. Marklund, Prof. C. J. Pethick

Scope of professional interests:
Hydrodynamics of quantum fluids, condensed matter physics, nuclear physics, astrophysics

Professional career:

  • 2007-2008 – engineer-researcher, Institute for Physics of Microstructures of Russian Academy of Sciences
  • 2010-2014 – PhD student in Umeå University, Sweden (PhD 2014)
  • 2011,2012,2013 – PhD fellow in NORDITA, Stockholm, Sweden
  • 2012,2013,2016 – scientific visits, Niels Bohr International Academy, Niels Bohr Institute, Copenhagen, Denmark
  • 2013 – scientific visit, Anton Pannekoek Institute for Astronomy (API), Amsterdam, Netherlands
  • 2013, 2014 – scientific visits, International Space Science Institute (ISSI), Bern, Switzerland
  • 2015 – scientific visit, European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Trento, Italy
  • 2014-2016 – postdoc, Institute for Nuclear Physics, Darmstadt Technical University, Darmstadt, Germany
  • since 2016 – researcher, Institute of Applied Physics of Russian Academy of Sciences

Membership in professional organizations:
Referee of Physical Review A, Physical Review E journals of American Physical Society

Awards, prizes:
Head of a scientific project of the Russian Fund for Fundamental Research 2016-2018, «Study of superfluid Fermi systems with applications to ultracold gases and neutron stars»

Main scientific results and peer-reviewed publications:

Novel results in hydrodynamics of multicomponent quantum fluids are obtained, in particular, a new method of generation of quantum turbulence in two-component Bose-Einstein condensates in ultracold gas by the Rayleigh-Taylor and Kelvin-Helmholtz instabilities is proposed.
The collective modes of the inner crust of neutron stars are calculated using several equations of state of nuclear matter at densities higher than the neutron drip density.
A novel structural instability caused by the superfluid dripped neutrons is found in the lattice of the inner crust of neutron stars, with important implications for modelling of seismology of neutron stars and the quasi-periodic oscillations in astrophysical x-ray bursts.
A renormalization method for the effective field theoretical description of the quantum vortex structure in strongly correlated superfluids and superconductors, as well as for description of the plasma dissipation in the core of neutron stars, is developed. 

1. Bezett A., Bychkov, V., Lundh, E., Kobyakov, D., Marklund, M.
Phys. Rev. A, 82, 043608, (2010).
Magnetic Richtmyer-Meshkov instability in a two-component Bose-Einstein condensate.

2. Kobyakov, D., Bychkov, V., Lundh, E., Bezett, A., Akkerman, V., Marklund, M.
Phys. Rev. A, 83, 043623, (2011).
Interface dynamics of a two-component Bose-Einstein condensate driven by an external force.

3. Kobyakov, D., Bezett, A., Lundh, E., Marklund, M, Bychkov, V.  
Phys. Rev. A, 85, 013630, (2012).
Quantum swapping of immiscible Bose-Einstein condensates as an alternative to the Rayleigh-Taylor instability.

4. Kobyakov, D., Bychkov, V.,  Lundh, E., Bezett, A., Marklund. M.
Phys. Rev. A 86, 023614, (2012).
Parametric resonance of capillary waves at the interface between two immiscible Bose-Einstein condensates.

5. Kobyakov, D. & Pethick, C. J.
Phys. Rev. C, 87, 055803 (2013).
Dynamics of the inner crust of neutron stars: Hydrodynamics, elasticity, and collective modes.

6. Kobyakov, D., Bezett, A., Lundh, E., Marklund, M, Bychkov. V.
Phys. Rev. A, 89, 013631 (2014).
Turbulence in Binary Bose-Einstein Condensates Generated by Highly Non-Linear Rayleigh-Taylor and Kelvin-Helmholtz Instabilities.

7. Kobyakov, D. & Pethick, C. J.
Phys. Rev. Lett., 112, 112504 (2014). Article selected as “Editor’s Suggestion”.
Towards a metallurgy of neutron star crusts.

8. Kobyakov, D. & Pethick, C. J.
MNRAS Letters 449, L110–L112 (2015).
Elastic properties of polycrystalline dense matter.