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Arkady Alexandrovich Tseytlin (Russian: Аркадий Александрович Цейтлин, born 31 August 1956)

is a Russian-British theoretical physicist. He is a professor of theoretical physics at Imperial College London and is also affiliated with the Lebedev Institute in Moscow. His research interests are in quantum field theory, quantum gravity  and string theory.

Most important  research contributions
1. demonstration of asymptotic freedom  of   renormalisable   quadratic  curvature  model of    quantum gravity [1]; discovery of  an ultraviolet-finite   theory based on  N=4 extended  conformal supergravity [2]; introduction of conformal  higher spin fields  generalizing Weyl graviton [3].

2. proposal of sigma-model approach to string  theory effective action [4] (including dilaton coupling to string world sheet and  representation of  effective action in terms of string  partition function [5,6]); discovery of key role of the Born-Infeld action in open string theory [7]; original computations of   leading alpha'  corrections to   string  effective action [8].

3. development of T-duality covariant formulation of string theory  based on "doubled" string action [9]; T-duality invariant  formulation  of  string cosmological  equations  stressing  crucial  role of the dilaton field evolution with time [10].

4. proposal of "harmonic superposition"  method for  constructing solitonic  solutions in string theory  that describe supersymmetric  bound states of   D-branes or M-branes [11]; discovery that the entropy of   M2-branes  and M5-branes have  novel  power (3/2 and 3)   scalings  with their  charge [12].

5. non-abelian generalization of the Born-Infeld  action [13]; one of the original   studies of  absorption  of quanta by D-branes  [14] that  played key  role in motivating    gauge-string  duality; study of  string corrections to D3-brane entropy implying that it should  be a non-trivial function of  the gauge coupling,  interpolating  between  weak  and  strong coupling regions [15].

6. construction of the  action for  the  superstring  propagating in  AdS5 x S5 space-time [16].

that became the   cornerstone  of the    AdS/CFT duality,   defining  string theory dual of  the maximally supersymmetric  Yang-Mills theory;  one of the first  investigations of basic  aspects  of AdS/CFT duality   relating the 2-point  correlator of super Yang-Mills  stress tensor  to its  5-dimensional  graviton  analog [17].

7. construction  of   the first exact supergravity solution describing a superposition of D-branes  on  6-dimensional conifold   which is dual to a  non-conformal N=1 supersymmetric  gauge theory with   a logarithmic renormalization group flow   encoded  in the  metric [18].

8. several  key  contributions to the study of   gauge-string duality:  development of semiclassical approach to  quantisation  of  AdS5 x S5 superstring [19];  suggestion of a novel  large-spin scaling limit that produced examples of direct comparison between the gauge theory  and string theory results for the spectrum of  non-supersymmetric states [20,21];  explicit one-loop and two-loop [22] quantum superstring  computations of  energies of various solitonic strings  that  played crucial role in the   construction  of the Bethe Ansatz describing the spectrum  of anomalous dimensions of  the  corresponding   gauge theory  operators.

Recognition
Tseytlin's   research achievements were recognised by the UK Royal Society Wolfson Research Merit  Award (2001)  and the Rayleigh Medal and Prize of the UK  Institute of Physics (2012).

Selected publications
1. E.S. Fradkin and A.A. Tseytlin, «Renormalizable asymptotically free quantum theory of gravity». Nucl.Phys. B 201 (1982) 469

2. E.S. Fradkin and A.A. Tseytlin, «Conformal anomaly in Weyl theory and anomaly-free superconformal theories». Phys.Lett. B134 (1984) 187

3. E.S. Fradkin and A.A. Tseytlin, «Conformal supergravity». Phys. Reports 119 (1985) 233

4. E.S. Fradkin and A.A. Tseytlin, «Quantum String Theory Effective Action». Nucl.Phys.B 261 (1985) 1

5. A.A. Tseytlin, «Vector field effective action in the open superstring theory». Nucl.Phys.B 276 (1986) 391

6. A.A. Tseytlin,  «Renormalization of Mobius infinities  and partition function representation for string theory effective action». Phys. Lett. B202 (1988) 81

7. E.S. Fradkin and A.A. Tseytlin, «Nonlinear Electrodynamics from Quantized Strings». Phys.Lett.B 163 (1985) 123

8. R.R. Metsaev and A.A. Tseytlin. «Order alpha-prime (two loop) equivalence of the string equations of motion and the sigma model Weyl invariance conditions: dependence on the dilaton and the antisymmetric tensor». Nucl.Phys.B 293 (1987) 385

9. A.A. Tseytlin. «Duality symmetric closed string theory and interacting chiral scalars». Nucl.Phys. B350 (1991) 395

10. A.A. Tseytlin and C. Vafa, «Elements of string cosmology». Nucl.Phys. B 372 (1992) 443

11. A.A. Tseytlin, «Harmonic superpositions of M-branes». Nucl.Phys. B 475 (1996) 149

12. I.R. Klebanov and A.A. Tseytlin, «Entropy of near extremal black p-branes». Nucl.Phys. B475 (1996) 164

13. A.A. Tseytlin, «On nonAbelian generalization of Born-Infeld action in string theory». Nucl.Phys. B501 (1997) 41

14. S.S. Gubser, I.R. Klebanov and A.A. Tseytlin, «String theory and classical absorption by three-branes». Nucl.Phys. B499 (1997) 217

15. S.S. Gubser, I.R. Klebanov and A.A. Tseytlin, «Coupling constant dependence in the thermodynamics of N=4 supersymmetric Yang-Mills theory». Nucl.Phys.B 534 (1998) 202

16. R.R. Metsaev and A.A. Tseytlin, «Type IIB superstring action in AdS5 x S5 background». Nucl.Phys. B533 (1998) 109

17. H. Liu and A.A. Tseytlin, «D = 4 superYang-Mills, D = 5 gauged supergravity, and D = 4 conformal supergravity». Nucl.Phys. B533 (1998) 88

18. I.R. Klebanov and A.A. Tseytlin, «Gravity duals of supersymmetric SU(N) x SU(N+M) gauge theories». Nucl.Phys. B578 (2000) 123

19. N. Drukker, D.J. Gross and  A.A. Tseytlin,   «Green-Schwarz string in AdS5 x S5: Semiclassical partition  function». JHEP 0004 (2000)  021

20. S. Frolov and A.A. Tseytlin, «Semiclassical quantization of rotating superstring in AdS5 x S5». JHEP 0206 (2002) 007

21. S. Frolov and A.A. Tseytlin, «Multispin string solutions in AdS5 x S5». Nucl.Phys. B668 (2003) 77

22. R. Roiban and A.A. Tseytlin, «Strong-coupling expansion of cusp anomaly from quantum superstring». JHEP 0711 (2007) 016