241 citations · 700 across the 13 of their papers we have counts for
13 papers
The Quantum Perfect Fluid in 2D
Aurélien Dersy, Andrei Khmelnitsky, Riccardo Rattazzi
We consider the field theory that defines a perfect incompressible 2D fluid. One distinctive property of this system is that the quadratic action for fluctuations around the ground…
Gapped Goldstones at the cut-off scale: a non-relativistic EFT
Gabriel Cuomo, Angelo Esposito, Emanuele Gendy +3
At finite density, the spontaneous breakdown of an internal non-Abelian symmetry dictates, along with gapless modes, modes whose gap is fixed by the algebra and proportional to the…
Light Particles with Spin in Inflation
Lorenzo Bordin, Paolo Creminelli, Andrei Khmelnitsky +1
The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with…
Relaxing the Cosmological Constant: a Proof of Concept
Lasma Alberte, Paolo Creminelli, Andrei Khmelnitsky +2
We propose a technically natural scenario whereby an initially large cosmological constant (c.c.) is relaxed down to the observed value due to the dynamics of a scalar evolving on…
Solid Holography and Massive Gravity
Lasma Alberte, Matteo Baggioli, Andrei Khmelnitsky +1
Momentum dissipation is an important ingredient in condensed matter physics that requires a translation breaking sector. In the bottom-up gauge/gravity duality, this implies that t…
Density matrix of black hole radiation
Lasma Alberte, Ram Brustein, Andrei Khmelnitsky +1
Hawking's model of black hole evaporation is not unitary and leads to a mixed density matrix for the emitted radiation, while the Page model describes a unitary evaporation process…
Stability of Massive Gravity Solutions for Holographic Conductivity
Lasma Alberte, Andrei Khmelnitsky
We consider non-linear massive gravity with two Stückelberg fields in which the diffeomorphism invariance is broken spontaneously in two of the spacetime directions. This theory ad…
Pulsar timing signal from ultralight scalar dark matter
Andrei Khmelnitsky, Valery Rubakov
An ultralight free scalar field with mass around 10^{-23} - 10^{-22} eV is a viable dark mater candidate, which can help to resolve some of the issues of the cold dark matter on su…
Reduced Massive Gravity with Two Stückelberg Fields
Lasma Alberte, Andrei Khmelnitsky
We consider the non-linear massive gravity as a theory of a number of Stückelberg scalar fields minimally coupled to the Einstein-Hilbert gravity and argue that the counting of deg…
On critical dimension in spherical black brane phase transition
Andrei Khmelnitsky
We study the Gregory-Laflamme instability of a large uniform black brane wrapping a two-sphere compactification manifold. This paper extends the work arXiv:hep-th/0604015, where th…
Interpreting multiple dualities conjectured from superconformal index identities
A. Khmelnitsky
We consider field theory side of new multiple Seiberg dualities conjectured within superconformal index matching approach. We study the case of SU(2) supersymmetric QCD and find th…
Constraining sterile neutrino dark matter by phase-space density observations
D. Gorbunov, A. Khmelnitsky, V. Rubakov
We apply phase-space density considerations to obtain lower bounds on the mass of sterile neutrino as dark matter candidate. The bounds are different for non-resonant production, r…
Is gravitino still a warm dark matter candidate?
D. Gorbunov, A. Khmelnitsky, V. Rubakov
We make use of the phase space density approach to discuss gravitino as a warm dark matter candidate. Barring fine tuning between the reheat temperature in the Universe and superpa…