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Volumn 2011, Issue 1, 2011, Pages

Mean values of local operators in highly excited Bethe states

Author keywords

Correlation functions; Form factors; Integrable quantum field theory; Quantum integrability (Bethe ansatz)

Indexed keywords


EID: 79751523127     PISSN: 17425468     EISSN: 17425468     Source Type: Journal    
DOI: 10.1088/1742-5468/2011/01/P01011     Document Type: Article
Times cited : (119)

References (60)
  • 1
    • 77953038372 scopus 로고    scopus 로고
    • Focus on dynamics and thermalization in isolated quantum many-body systems
    • Cazalilla M A and Rigol M, Focus on dynamics and thermalization in isolated quantum many-body systems, 2010 New J. Phys. 12 055006
    • (2010) New J. Phys. , vol.12 , pp. 055006
    • Cazalilla, M.A.1    Rigol, M.2
  • 2
    • 0000521886 scopus 로고
    • Effect of Bose condensation on inelastic processes in gases
    • Kagan Y, Svistunov B V and Shlyapnikov G V, Effect of Bose condensation on inelastic processes in gases, 1985 JETP Lett. 42 209
    • (1985) JETP Lett. , vol.42 , pp. 209
    • Kagan, Y.1    Svistunov, B.V.2    Shlyapnikov, G.V.3
  • 3
    • 7044272685 scopus 로고    scopus 로고
    • Low-dimensional trapped gases
    • arXiv:cond-mat/0409230
    • Petrov D, Gangardt D and Shlyapnikov G, Low-dimensional trapped gases, 2004 J. Physique IV 116 5 arXiv:cond-mat/0409230
    • (2004) J. Physique IV , vol.116 , pp. 5
    • Petrov, D.1    Gangardt, D.2    Shlyapnikov, G.3
  • 4
    • 0000244510 scopus 로고
    • Exact form-factors in (1+1)-dimensional field theoretic models with soliton behavior
    • Karowski M and Weisz P, Exact form-factors in (1+1)-dimensional field theoretic models with soliton behavior, 1978 Nucl. Phys. B 139 455
    • (1978) Nucl. Phys. B , vol.139 , pp. 455
    • Karowski, M.1    Weisz, P.2
  • 5
    • 0003199206 scopus 로고
    • Form-factors in completely integrable models of quantum field theory
    • Smirnov F A, Form-factors in completely integrable models of quantum field theory, 1992 Adv. Ser. Math. Phys. 14 1
    • (1992) Adv. Ser. Math. Phys. , vol.14 , pp. 1
    • Smirnov, F.A.1
  • 6
    • 0000755238 scopus 로고
    • Two point correlation function in scaling Lee-Yang model
    • Zamolodchikov A B, Two point correlation function in scaling Lee-Yang model, 1991 Nucl. Phys. B 348 619
    • (1991) Nucl. Phys. B , vol.348 , pp. 619
    • Zamolodchikov, A.B.1
  • 7
    • 0000911495 scopus 로고    scopus 로고
    • Asymptotic factorisation of form factors in two-dimensional quantum field theory
    • arXiv:hep-th/9607046
    • Delfino G, Simonetti P and Cardy J L, Asymptotic factorisation of form factors in two-dimensional quantum field theory, 1996 Phys. Lett. B 387 327 arXiv:hep-th/9607046
    • (1996) Phys. Lett. B , vol.387 , pp. 327
    • Delfino, G.1    Simonetti, P.2    Cardy, J.L.3
  • 8
    • 0030607742 scopus 로고    scopus 로고
    • Finite temperature correlations in the one-dimensional quantum Ising model
    • arXiv:cond-mat/9606104
    • Leclair A, Lesage F, Sachdev S and Saleur H, Finite temperature correlations in the one-dimensional quantum Ising model, 1996 Nucl. Phys. B 482 579 arXiv:cond-mat/9606104
    • (1996) Nucl. Phys. B , vol.482 , pp. 579
    • Leclair, A.1    Lesage, F.2    Sachdev, S.3    Saleur, H.4
  • 9
    • 0033584140 scopus 로고    scopus 로고
    • Finite temperature correlation functions in integrable QFT
    • arXiv:hep-th/9902075
    • Leclair A and Mussardo G, Finite temperature correlation functions in integrable QFT, 1999 Nucl. Phys. B 552 624 arXiv:hep-th/9902075
    • (1999) Nucl. Phys. B , vol.552 , pp. 624
    • Leclair, A.1    Mussardo, G.2
  • 10
    • 0034695767 scopus 로고    scopus 로고
    • A comment on finite temperature correlations in integrable QFT
    • arXiv:hep-th/9909019
    • Saleur H, A comment on finite temperature correlations in integrable QFT, 2000 Nucl. Phys. B 567 602 arXiv:hep-th/9909019
    • (2000) Nucl. Phys. B , vol.567 , pp. 602
    • Saleur, H.1
  • 11
    • 0035815605 scopus 로고    scopus 로고
    • One-point functions in integrable quantum field theory at finite temperature
    • arXiv:hep-th/0101180
    • Delfino G, One-point functions in integrable quantum field theory at finite temperature, 2001 J. Phys. A: Math. Gen. 34 L161 arXiv:hep-th/0101180
    • (2001) J. Phys. A: Math. Gen. , vol.34
    • Delfino, G.1
  • 12
    • 0035860657 scopus 로고    scopus 로고
    • On the finite temperature formalism in integrable quantum field theories
    • arXiv:hep-th/0103214
    • Mussardo G, On the finite temperature formalism in integrable quantum field theories, 2001 J. Phys. A: Math. Gen. 34 7399 arXiv:hep-th/0103214
    • (2001) J. Phys. A: Math. Gen. , vol.34 , pp. 7399
    • Mussardo, G.1
  • 13
    • 0037025847 scopus 로고    scopus 로고
    • Finite temperature correlation functions from form factors
    • arXiv:hep-th/0203130
    • Castro-Alvaredo O A and Fring A, Finite temperature correlation functions from form factors, 2002 Nucl. Phys. B 636 611 arXiv:hep-th/0203130
    • (2002) Nucl. Phys. B , vol.636 , pp. 611
    • Castro-Alvaredo, O.A.1    Fring, A.2
  • 14
    • 35748951903 scopus 로고    scopus 로고
    • Form factors in finite volume II: Disconnected terms and finite temperature correlators
    • arXiv:0706.3605 hep-th
    • Pozsgay B and Takacs G, Form factors in finite volume II: disconnected terms and finite temperature correlators, 2008 Nucl. Phys. B 788 209 arXiv:0706.3605 [hep-th]
    • (2008) Nucl. Phys. B , vol.788 , pp. 209
    • Pozsgay, B.1    Takacs, G.2
  • 15
    • 70450190453 scopus 로고    scopus 로고
    • Expectation values in the Lieb-Liniger Bose gas
    • arXiv:0909.1336 cond-mat.stat-mech
    • Kormos M, Mussardo G and Trombettoni A, Expectation values in the Lieb-Liniger Bose gas, 2009 Phys. Rev. Lett. 103 210404 arXiv:0909.1336 [cond-mat.stat-mech]
    • (2009) Phys. Rev. Lett. , vol.103 , pp. 210404
    • Kormos, M.1    Mussardo, G.2    Trombettoni, A.3
  • 16
    • 77950830182 scopus 로고    scopus 로고
    • 1D Lieb-liniger Bose gas as non-relativistic limit of the sinh-Gordon model
    • arXiv:0912.3502 cond-mat.stat-mech
    • Kormos M, Mussardo G and Trombettoni A, 1D Lieb-Liniger Bose gas as non-relativistic limit of the sinh-Gordon model, 2010 Phys. Rev. A 81 043606 arXiv:0912.3502 [cond-mat.stat-mech]
    • (2010) Phys. Rev. A , vol.81 , pp. 043606
    • Kormos, M.1    Mussardo, G.2    Trombettoni, A.3
  • 17
    • 26344439240 scopus 로고
    • Exact analysis of an interacting Bose gas. I. The general solution and the ground state
    • Lieb E H and Liniger W, Exact analysis of an interacting Bose gas. I. The general solution and the ground state, 1963 Phys. Rev. 130 1605
    • (1963) Phys. Rev. , vol.130 , pp. 1605
    • Lieb, E.H.1    Liniger, W.2
  • 19
    • 78650335560 scopus 로고    scopus 로고
    • Bethe ansatz matrix elements as non-relativistic limits of form factors of quantum field theory
    • arXiv:1002.3387 cond-mat.stat-mech
    • Kormos M, Mussardo G and Pozsgay B, Bethe ansatz matrix elements as non-relativistic limits of form factors of quantum field theory, 2010 J. Stat. Mech. P05014 arXiv:1002.3387 [cond-mat.stat-mech]
    • (2010) J. Stat. Mech.
    • Kormos, M.1    Mussardo, G.2    Pozsgay, B.3
  • 20
    • 77953033198 scopus 로고    scopus 로고
    • Quantum quenches in integrable field theories
    • arXiv:0911.3345 cond-mat.stat-mech
    • Fioretto D and Mussardo G, Quantum Quenches in Integrable Field Theories, 2009 New J. Phys. 12 055015 arXiv:0911.3345 [cond-mat.stat-mech]
    • (2009) New J. Phys. , vol.12 , pp. 055015
    • Fioretto, D.1    Mussardo, G.2
  • 21
    • 0142182550 scopus 로고    scopus 로고
    • Haldane gapped spin chains: Exact low temperature expansions of correlation functions
    • arXiv:cond-mat/0105284
    • Konik R, Haldane gapped spin chains: exact low temperature expansions of correlation functions, 2003 Phys. Rev. B 68 104435 arXiv:cond-mat/0105284
    • (2003) Phys. Rev. B , vol.68 , pp. 104435
    • Konik, R.1
  • 22
    • 52249096809 scopus 로고    scopus 로고
    • Finite-temperature lineshapes in gapped quantum spin chains
    • arXiv:0711.2524 cond-mat.str-el
    • Essler F H L and Konik R M, Finite-temperature lineshapes in gapped quantum spin chains, 2008 Phys. Rev. B 78 100403 arXiv:0711.2524 [cond-mat.str-el]
    • (2008) Phys. Rev. B , vol.78 , pp. 100403
    • Essler, F.H.L.1    Konik, R.M.2
  • 23
    • 72449167081 scopus 로고    scopus 로고
    • Finite-temperature dynamical correlations in massive integrable quantum field theories
    • arXiv:0907.0779 cond-mat.str-el
    • Essler F H L and Konik R M, Finite-temperature dynamical correlations in massive integrable quantum field theories, 2009 J. Stat. Mech. P09018 arXiv:0907.0779 [cond-mat.str-el]
    • (2009) J. Stat. Mech.
    • Essler, F.H.L.1    Konik, R.M.2
  • 24
    • 78650385126 scopus 로고    scopus 로고
    • Form factor expansion for thermal correlators
    • Pozsgay B and Takacs G, Form factor expansion for thermal correlators, 2010 J. Stat. Mech. P11012
    • (2010) J. Stat. Mech.
    • Pozsgay, B.1    Takacs, G.2
  • 25
    • 0001099374 scopus 로고
    • Ground-state energy of a Heisenberg-ising lattice
    • Yang C N and Yang C P, Ground-state energy of a Heisenberg-Ising lattice, 1966 Phys. Rev. 147 303
    • (1966) Phys. Rev. , vol.147 , pp. 303
    • Yang, C.N.1    Yang, C.P.2
  • 26
    • 0001017120 scopus 로고
    • Thermodynamics of a one-dimensional system of bosons with repulsive delta-function interaction
    • Yang C N and Yang C P, Thermodynamics of a one-dimensional system of bosons with repulsive delta-function interaction, 1969 J. Math. Phys. 10 1115
    • (1969) J. Math. Phys. , vol.10 , pp. 1115
    • Yang, C.N.1    Yang, C.P.2
  • 27
    • 0000363878 scopus 로고
    • Thermodynamic Bethe ansatz in relativistic models. Scaling three state Potts and Lee-Yang models
    • Zamolodchikov Al B, Thermodynamic Bethe ansatz in relativistic models. Scaling three state Potts and Lee-Yang models, 1990 Nucl. Phys. B 342 695
    • (1990) Nucl. Phys. B , vol.342 , pp. 695
    • Al Zamolodchikov, B.1
  • 28
    • 34147147879 scopus 로고
    • Nonequal-time current correlation function in a one-dimensional Bose gas
    • Slavnov N A, Nonequal-time current correlation function in a one-dimensional Bose gas, 1990 Theor. Math. Phys. 82 273
    • (1990) Theor. Math. Phys. , vol.82 , pp. 273
    • Slavnov, N.A.1
  • 29
    • 70349658891 scopus 로고    scopus 로고
    • On the thermodynamic limit of form factors in the massless XXZ Heisenberg chain
    • arXiv:0903.2916 hep-th
    • Kitanine N, Kozlowski K K, Maillet J M, Slavnov N A and Terras V, On the thermodynamic limit of form factors in the massless XXZ Heisenberg chain, 2009 J. Math. Phys. 50 095209 arXiv:0903.2916 [hep-th]
    • (2009) J. Math. Phys. , vol.50 , pp. 095209
    • Kitanine, N.1    Kozlowski, K.K.2    Maillet, J.M.3    Slavnov, N.A.4    Terras, V.5
  • 31
    • 42249112261 scopus 로고    scopus 로고
    • Thermalization and its mechanism for generic isolated quantum systems
    • arXiv:0708.1324 cond-mat.stat-mech
    • Rigol M, Dunjko V and Olshanii M, Thermalization and its mechanism for generic isolated quantum systems, 2008 Nature 452 854 arXiv:0708.1324 [cond-mat.stat-mech]
    • (2008) Nature , vol.452 , pp. 854
    • Rigol, M.1    Dunjko, V.2    Olshanii, M.3
  • 32
    • 51849123590 scopus 로고    scopus 로고
    • Finite temperature expectation values of boundary operators
    • arXiv:0804.4096 hep-th
    • Takacs G, Finite temperature expectation values of boundary operators, 2008 Nucl. Phys. B 805 391 arXiv:0804.4096 [hep-th]
    • (2008) Nucl. Phys. B , vol.805 , pp. 391
    • Takacs, G.1
  • 33
    • 33645929032 scopus 로고
    • Factorized S-matrices in two dimensions as the exact solutions of certain relativistic quantum field models
    • Zamolodchikov A B and Zamolodchikov A B, Factorized S-matrices in two dimensions as the exact solutions of certain relativistic quantum field models, 1979 Ann. Phys. 120 253
    • (1979) Ann. Phys. , vol.120 , pp. 253
    • Zamolodchikov, A.B.1    Zamolodchikov, A.B.2
  • 34
    • 0000203153 scopus 로고
    • Off critical statistical models: Factorized scattering theories and bootstrap program
    • Mussardo G, Off critical statistical models: Factorized scattering theories and bootstrap program, 1992 Phys. Rep. 218 215
    • (1992) Phys. Rep. , vol.218 , pp. 215
    • Mussardo, G.1
  • 35
    • 35748940616 scopus 로고    scopus 로고
    • Form factors in finite volume I: Form factor bootstrap and truncated conformal space
    • arXiv:0706.1445 hep-th
    • Pozsgay B and Takacs G, Form factors in finite volume I: form factor bootstrap and truncated conformal space, 2008 Nucl. Phys. B 788 167 arXiv:0706.1445 [hep-th]
    • (2008) Nucl. Phys. B , vol.788 , pp. 167
    • Pozsgay, B.1    Takacs, G.2
  • 36
    • 0009529354 scopus 로고    scopus 로고
    • Form factors in the finite volume
    • arXiv:math-ph/9812026
    • Korepin V E and Slavnov N A, Form factors in the finite volume, 1999 Int. J. Mod. Phys. B 13 2933 arXiv:math-ph/9812026
    • (1999) Int. J. Mod. Phys. B , vol.13 , pp. 2933
    • Korepin, V.E.1    Slavnov, N.A.2
  • 37
    • 0002779065 scopus 로고
    • The quantum inverse scattering method approach to correlation functions
    • Izergin A G and Korepin V E, The quantum inverse scattering method approach to correlation functions, 1984 Commun. Math. Phys. 94 67
    • (1984) Commun. Math. Phys. , vol.94 , pp. 67
    • Izergin, A.G.1    Korepin, V.E.2
  • 38
    • 0002657301 scopus 로고
    • Correlation functions of the one-dimensional Bose gas in the repulsive case
    • Korepin V E, Correlation functions of the one-dimensional Bose gas in the repulsive case, 1984 Commun. Math. Phys. 94 93
    • (1984) Commun. Math. Phys. , vol.94 , pp. 93
    • Korepin, V.E.1
  • 41
    • 0001181969 scopus 로고
    • Boundary S matrix and boundary state in two-dimensional integrable quantum field theory
    • arXiv:hep-th/9306002
    • Ghoshal S and Zamolodchikov A B, Boundary S matrix and boundary state in two-dimensional integrable quantum field theory, 1994 Int. J. Mod. Phys. A 9 3841 arXiv:hep-th/9306002
    • (1994) Int. J. Mod. Phys. A , vol.9 , pp. 3841
    • Ghoshal, S.1    Zamolodchikov, A.B.2
  • 42
    • 33746233567 scopus 로고    scopus 로고
    • On the boundary form factor program
    • arXiv:hep-th/0603171
    • Bajnok Z, Palla L and Takacs G, On the boundary form factor program, 2006 Nucl. Phys. B 750 179 arXiv:hep-th/0603171
    • (2006) Nucl. Phys. B , vol.750 , pp. 179
    • Bajnok, Z.1    Palla, L.2    Takacs, G.3
  • 43
    • 48449097148 scopus 로고    scopus 로고
    • Boundary form factors in finite volume
    • arXiv:0712.1886 hep-th
    • Kormos M and Takacs G, Boundary form factors in finite volume, 2008 Nucl. Phys. B 803 277 arXiv:0712.1886 [hep-th]
    • (2008) Nucl. Phys. B , vol.803 , pp. 277
    • Kormos, M.1    Takacs, G.2
  • 44
    • 0142116623 scopus 로고
    • Some exact results for the two-point function of an integrable quantum field theory
    • Creamer D B, Thacker H B and Wilkinson D, Some exact results for the two-point function of an integrable quantum field theory, 1981 Phys. Rev. D 23 3081
    • (1981) Phys. Rev. D , vol.23 , pp. 3081
    • Creamer, D.B.1    Thacker, H.B.2    Wilkinson, D.3
  • 45
    • 0033575637 scopus 로고    scopus 로고
    • Form factors of the XXZ Heisenberg spin-1/2 finite chain
    • arXiv:math-ph/9807020
    • Kitanine N, Maillet J M and Terras V, Form factors of the XXZ Heisenberg spin-1/2 finite chain, 1999 Nucl. Phys. B 554 647 arXiv:math-ph/9807020
    • (1999) Nucl. Phys. B , vol.554 , pp. 647
    • Kitanine, N.1    Maillet, J.M.2    Terras, V.3
  • 46
    • 34250725341 scopus 로고    scopus 로고
    • Form factors of integrable Heisenberg (higher) spin chains
    • arXiv:hep-th/0702186
    • Castro-Alvaredo O A and Maillet J M, Form factors of integrable Heisenberg (higher) spin chains, 2007 J. Phys. A: Math. Theor. 40 7451 arXiv:hep-th/0702186
    • (2007) J. Phys. A: Math. Theor , vol.40 , pp. 7451
    • Castro-Alvaredo, O.A.1    Maillet, J.M.2
  • 47
    • 0003130040 scopus 로고
    • Field-theoretical approach to critical behaviour at surfaces
    • ed C Domb and J L Lebowitz London: Academic
    • Diehl H W, Field-theoretical approach to critical behaviour at surfaces, 1986 Phase Transitions and Critical Phenomena vol 10, ed C Domb and J L Lebowitz (London: Academic) pp 75-267
    • (1986) Phase Transitions and Critical Phenomena , vol.10 , pp. 75-267
    • Diehl, H.W.1
  • 48
    • 77954901718 scopus 로고    scopus 로고
    • One-point functions in massive integrable QFT with boundaries
    • JHEP04 2010, arXiv:1002.2783 hep-th
    • Kormos M and Pozsgay B, One-point functions in massive integrable QFT with boundaries, 2010 J. High Energy Phys. JHEP04 (2010) 112 arXiv:1002.2783 [hep-th]
    • (2010) J. High Energy Phys. , pp. 112
    • Kormos, M.1    Pozsgay, B.2
  • 49
    • 84892725585 scopus 로고    scopus 로고
    • On O (1) contributions to the free energy in Bethe ansatz systems: The exact g-function
    • JHEP08 2010, arXiv:1003.5542 hep-th
    • Pozsgay B, On O (1) contributions to the free energy in Bethe ansatz systems: the exact g-function, 2010 J. High Energy Phys. JHEP08 (2010) 090 arXiv:1003.5542 [hep-th]
    • (2010) J. High Energy Phys. , pp. 090
    • Pozsgay, B.1
  • 50
    • 0001001973 scopus 로고
    • Boundary energy and boundary states in integrable quantum field theories
    • arXiv:hep-th/9503227
    • LeClair A, Mussardo G, Saleur H and Skorik S, Boundary energy and boundary states in integrable quantum field theories, 1995 Nucl. Phys. B 453 581 arXiv:hep-th/9503227
    • (1995) Nucl. Phys. B , vol.453 , pp. 581
    • LeClair, A.1    Mussardo, G.2    Saleur, H.3    Skorik, S.4
  • 51
    • 0039300296 scopus 로고
    • Quantum statistical mechanics in a closed system
    • Deutsch J M, Quantum statistical mechanics in a closed system, 1991 Phys. Rev. A 43 2046
    • (1991) Phys. Rev. A , vol.43 , pp. 2046
    • Deutsch, J.M.1
  • 52
    • 4243410292 scopus 로고
    • Chaos and quantum thermalization
    • arXiv:cond-mat/9403051
    • Srednicki M, Chaos and quantum thermalization, 1994 Phys. Rev. E 50 888 arXiv:cond-mat/9403051
    • (1994) Phys. Rev. E , vol.50 , pp. 888
    • Srednicki, M.1
  • 53
    • 33846840504 scopus 로고    scopus 로고
    • Relaxation in a completely integrable many-body quantum system: An ab initio study of the dynamics of the highly excited states of 1D lattice hard-core bosons
    • arXiv:cond-mat/0604476
    • Rigol M, Dunjko V, Yurovsky V and Olshanii M, Relaxation in a completely integrable many-body quantum system: an ab initio study of the dynamics of the highly excited states of 1D lattice hard-core bosons, 2007 Phys. Rev. Lett. 98 050405 arXiv:cond-mat/0604476
    • (2007) Phys. Rev. Lett. , vol.98 , pp. 050405
    • Rigol, M.1    Dunjko, V.2    Yurovsky, V.3    Olshanii, M.4
  • 54
    • 84889234745 scopus 로고    scopus 로고
    • The form factor program: A review and new results-the nested su(N) off-shell Bethe ansatz
    • arXiv:hep-th/0609130
    • Babujian H M, Foerster A and Karowski M, The form factor program: a review and new results-the nested su(N) off-shell Bethe ansatz, 2006 SIGMA 2 082 arXiv:hep-th/0609130
    • (2006) SIGMA , vol.2 , pp. 082
    • Babujian, H.M.1    Foerster, A.2    Karowski, M.3
  • 56
    • 0242386297 scopus 로고
    • Calculation of the norm of bethe vectors in models with su(3)-symmetry
    • Reshetikhin N Y, Calculation of the norm of bethe vectors in models with su(3)-symmetry, 1989 J. Math. Sci. 46 1694
    • (1989) J. Math. Sci. , vol.46 , pp. 1694
    • Reshetikhin, N.Y.1
  • 57
    • 0347245337 scopus 로고    scopus 로고
    • The Hubbard chain: Lieb-Wu equations and norm of the eigenfunctions
    • arXiv:cond-mat/9908114
    • Göhmann F and Korepin V E, The Hubbard chain: Lieb-Wu equations and norm of the eigenfunctions, 1999 Phys. Lett. A 263 293 arXiv:cond-mat/9908114
    • (1999) Phys. Lett. A , vol.263 , pp. 293
    • Göhmann, F.1    Korepin, V.E.2
  • 58
    • 33846349357 scopus 로고
    • Calculation of norms of Bethe wavefunctions
    • Korepin V E, Calculation of norms of Bethe wavefunctions, 1982 Commun. Math. Phys. 86 391
    • (1982) Commun. Math. Phys. , vol.86 , pp. 391
    • Korepin, V.E.1
  • 59
    • 34547564932 scopus 로고
    • Forces in molecules
    • Feynman R P, Forces in molecules, 1939 Phys. Rev. 56 340
    • (1939) Phys. Rev. , vol.56 , pp. 340
    • Feynman, R.P.1


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