1.

Diagonal finite volume matrix elements in the sinhGordon model
/ Bajnok, Zoltan ; Smirnov, Fedor
Using the fermionic basis we conjecture exact expressions for diagonal finite volume matrix elements of exponential operators and their descendants in the sinhGordon theory. [...]
Published in Nuclear Physics B 945 (2019)
10.1016/j.nuclphysb.2019.114664
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2.

Unusual square roots in the ghostfree theory of massive gravity
/ Golovnev, Alexey ; Smirnov, Fedor
A crucial building block of the ghost free massive gravity is the square root function of a matrix. [...]
Published in JHEP 1706 (2017) 130
10.1007/JHEP06(2017)130
arXiv:1704.08874
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3.

Dealing with ghostfree massive gravity without explicit square roots of matrices
/ Golovnev, Alexey ; Smirnov, Fedor
In this paper we entertain a simple idea that the action of ghost free massive gravity (in metric formulation) depends not on the full structure of the square root of a matrix but rather on its invariants given by the elementary symmetric polynomials of the eigenvalues. [...]
Published in Physics letters B (2017)
10.1016/j.physletb.2017.04.058
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