1.

The most general λ deformation of CFTs and integrability
/ Georgiou, George ; Sfetsos, Konstantinos
We show that the CFT with symmetry group G k 1 × G k 2 × ⋯ × G k n $$ {G}_{k_1}\times {G}_{k_2}\times \cdots \times {G}_{k_n} $$ consisting of WZW models based on the same group G , but at arbitrary integer levels, admits an integrable deformation depending on 2( n − 1) continuous parameters. [...]
Published in JHEP 1903 (2019) 094
10.1007/JHEP03(2019)094
arXiv:1812.04033
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2.

Weyl anomaly and the C function in λ deformed CFTs
/ Sagkrioti, Eftychia ; Sfetsos, Konstantinos ; Siampos, Konstantinos
For a general λ deformation of current algebra CFTs we compute the exact Weyl anomaly coefficient and the corresponding metric in the couplings space geometry. [...]
Published in Nuclear Physics B 938 (2019) 426439
10.1016/j.nuclphysb.2018.11.024
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3.

Novel all loop actions of interacting CFTs: Construction, integrability and RG flows
/ Georgiou, George ; Sfetsos, Konstantinos
We construct the all loop effective action representing, for small couplings, simultaneously self and mutually interacting current algebra CFTs realized by WZW models. [...]
Published in Nuclear Physics B 937 (2018) 371393
10.1016/j.nuclphysb.2018.10.018
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4.

NonAbelian Tduality and modular invariance
/ Fraser, Benjo ; Manolopoulos, Dimitrios ; Sfetsos, Konstantinos
Twodimensional σ models corresponding to coset CFTs of the type (gˆk⊕hˆℓ)/hˆk+ℓ admit a zoomin limit involving sending one of the levels, say ℓ , to infinity. [...]
Published in Nuclear Physics B (2018)
10.1016/j.nuclphysb.2018.07.017
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5.

Tduality and highderivative gravity theories: the BTZ black hole/string paradigm
/ Edelstein, José ; Sfetsos, Konstantinos ; SierraGarcia, J. ; López, Alejandro
We show that the temperature and entropy of a BTZ black hole are invariant under Tduality to next to leading order in M ⋆ − 2 , M ⋆ being the scale suppressing highercurvature/derivative terms in the Lagrangian. [...]
Published in JHEP 1806 (2018) 142
10.1007/JHEP06(2018)142
arXiv:1803.04517
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6.

The exact C function in integrable λ deformed theories
/ Georgiou, George ; Panopoulos, Pantelis ; Sagkrioti, Eftychia ; Sfetsos, Konstantinos ; et al
By employing CFT techniques, we show how to compute in the context of λ deformations of current algebras and coset CFTs the exact in the deformation parameters C function for a wide class of integrable theories that interpolate between a UV and an IR point. [...]
Published in Physics letters B (2018)
10.1016/j.physletb.2018.06.023
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7.

Penrose limits of Abelian and nonAbelian Tduals of AdS 5 × S 5 and their field theory duals
/ Itsios, Georgios ; Nastase, Horatiu ; Núñez, Carlos ; Sfetsos, Konstantinos ; et al
We consider the backgrounds obtained by Abelian and nonAbelian Tduality applied on AdS 5 × S 5 . [...]
Published in JHEP 1801 (2018) 071
10.1007/JHEP01(2018)071
arXiv:1711.09911
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8.

Integrable deformations of the Gk1×Gk2/Gk1+k2 coset CFTs
/ Sfetsos, Konstantinos ; Siampos, Konstantinos
We study the effective action for the integrable λ deformation of the Gk1×Gk2/Gk1+k2 coset CFTs. [...]
Published in Nuclear Physics B (2017)
10.1016/j.nuclphysb.2017.12.011
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9.

Integrable flows between exact CFTs
/ Georgiou, George ; Sfetsos, Konstantinos
We explicitly construct families of integrable σ model actions smoothly interpolating between exact CFTs. [...]
Published in JHEP 1711 (2017) 078
10.1007/JHEP11(2017)078
arXiv:1707.05149
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10.

Double and cyclic λ deformations and their canonical equivalents
/ Georgiou, George ; Sfetsos, Konstantinos ; Siampos, Konstantinos
We prove that the doubly λ deformed σ models, which include integrable cases, are canonically equivalent to the sum of two single λ deformed models. [...]
Published in Physics letters B (2017)
10.1016/j.physletb.2017.06.007
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