Stress Tensor Deformations in dS/CFT: Mixed Boundary Conditions, Spectrum Flow and Pseudo Entropy
Pith reviewed 2026-06-27 15:56 UTC · model grok-4.3
The pith
Stress tensor deformations of the boundary theory in dS/CFT are encoded as mixed boundary conditions on the bulk metric at future infinity.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
In the Kerr-dS3/CFT2 setting the conserved charges constructed from the holographic boundary stress tensor agree exactly with the boundary spectrum obtained from the field-theoretic flow equation under stress tensor deformations, providing a consistency check of the mixed-boundary-condition dictionary.
What carries the argument
Mixed boundary conditions imposed on the bulk metric at future infinity, which implement the stress tensor deformation through coupled metric-flow equations.
If this is right
- The coupled flow equations fix both the deformed boundary metric and the deformed stress tensor, thereby determining the source-response relation of the deformed theory.
- Holographic pseudo entropy of boundary intervals follows from complexified geodesic saddles in the deformed bulk geometry.
- Explicit results are obtained for the pseudo entropy under both T bar T and root-T bar T deformations.
Where Pith is reading between the lines
- The mixed-boundary prescription may supply a systematic way to deform dS/CFT dualities beyond the cases checked here.
- The same flow construction could be applied to other stress-tensor-like operators or to higher-dimensional dS/CFT pairs.
- Pseudo-entropy calculations in the deformed geometry may connect to entanglement properties of de Sitter space that are not accessible with standard boundary conditions.
Load-bearing premise
That stress tensor deformations of the boundary theory are holographically realized by mixed boundary conditions on the bulk metric rather than by Dirichlet or Neumann conditions.
What would settle it
A direct computation in Kerr-dS3/CFT2 in which the conserved charges from the holographic stress tensor differ from the spectrum produced by the boundary flow equation.
read the original abstract
We formulate a semiclassical stress tensor deformation dictionary in the context of the dS/CFT correspondence. Using the metric-flow formulation, we propose that stress tensor deformations of the putative boundary theory are encoded holographically as mixed boundary conditions for the bulk metric at future infinity. The coupled flow equations determine the deformed boundary metric and stress tensor, thereby specifying the source--response relation of the deformed boundary theory. We test the proposal in Kerr-dS$_3$/CFT$_2$, where the conserved charges constructed from the holographic boundary stress tensor agree exactly with the boundary spectrum obtained from the field-theoretic flow equation, providing a nontrivial consistency check of the dictionary. As an application, we compute the holographic pseudo entropy of boundary intervals from complexified geodesic saddles in the deformed Kerr-dS$_3$ geometry, and present explicit results for the $T\bar{T}$ and root-$T\bar{T}$ deformations.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes a semiclassical dictionary for stress tensor deformations in dS/CFT, encoding them via mixed boundary conditions on the bulk metric at future infinity within the metric-flow formulation. Coupled flow equations determine the deformed boundary metric and stress tensor. In the Kerr-dS3/CFT2 example, conserved charges from the holographic boundary stress tensor are reported to agree exactly with the spectrum from the field-theoretic flow equation, presented as a nontrivial consistency check. The work further computes holographic pseudo entropy for Tar{T} and root-Tar{T} deformations via complexified geodesic saddles in the deformed geometry.
Significance. If the mixed boundary conditions can be independently justified, the framework would extend dS/CFT to handle stress tensor deformations systematically, with the exact match in Kerr-dS3/CFT2 serving as a concrete check and the pseudo entropy results as a direct application. The metric-flow approach is a positive feature for tracking deformations. The result's impact depends on whether the agreement is shown to be non-tautological.
major comments (2)
- [Formulation of the dictionary (around the statement of mixed BCs)] The proposal that stress tensor deformations are encoded as mixed (rather than Dirichlet or Neumann) boundary conditions at future infinity is central to the dictionary and the subsequent claims. The manuscript motivates these conditions from the flow equations but does not supply a first-principles variational derivation from the bulk gravitational action; without this, the exact agreement between holographic charges and the field-theoretic spectrum risks being by construction rather than an independent check.
- [Kerr-dS3/CFT2 section (the consistency check paragraph)] In the Kerr-dS3/CFT2 consistency check, the manuscript states that the holographic conserved charges agree exactly with the boundary spectrum from the flow equation. It should be shown explicitly (with the relevant equations) that the flow equation itself is not derived from the same dS/CFT dictionary used to define the holographic stress tensor, to substantiate that the match is nontrivial.
minor comments (1)
- [Section introducing the flow equations] Notation for the mixed boundary conditions and the flow equations should be introduced with explicit component forms or an equation number to allow direct comparison with the undeformed dS/CFT dictionary.
Simulated Author's Rebuttal
We thank the referee for the careful reading and constructive comments on our manuscript. We address each major comment below, indicating planned revisions where appropriate.
read point-by-point responses
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Referee: [Formulation of the dictionary (around the statement of mixed BCs)] The proposal that stress tensor deformations are encoded as mixed (rather than Dirichlet or Neumann) boundary conditions at future infinity is central to the dictionary and the subsequent claims. The manuscript motivates these conditions from the flow equations but does not supply a first-principles variational derivation from the bulk gravitational action; without this, the exact agreement between holographic charges and the field-theoretic spectrum risks being by construction rather than an independent check.
Authors: We agree that a first-principles variational derivation of the mixed boundary conditions directly from the bulk gravitational action would strengthen the proposal. The current manuscript introduces the mixed BCs by requiring consistency with the metric-flow equations that define the stress tensor deformations, as these equations determine the coupled evolution of the boundary metric and stress tensor. This is the core of the semiclassical dictionary we propose. To address the concern, we will revise the relevant section to include an expanded discussion of how the mixed conditions follow from the flow equations and their relation to the variational principle, including a sketch of the necessary boundary terms. A complete derivation may lie beyond the semiclassical scope of this work but can be noted as a direction for future study. revision: partial
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Referee: [Kerr-dS3/CFT2 section (the consistency check paragraph)] In the Kerr-dS3/CFT2 consistency check, the manuscript states that the holographic conserved charges agree exactly with the boundary spectrum from the flow equation. It should be shown explicitly (with the relevant equations) that the flow equation itself is not derived from the same dS/CFT dictionary used to define the holographic stress tensor, to substantiate that the match is nontrivial.
Authors: The flow equation employed in the Kerr-dS3/CFT2 section is the standard field-theoretic flow equation for the given stress tensor deformation (the usual TTbar or root-TTbar equation on the boundary CFT2), taken from the field theory literature and independent of the dS/CFT dictionary. The holographic conserved charges are obtained from the boundary stress tensor constructed via the bulk metric in the deformed geometry with the proposed mixed BCs. The exact agreement is thus a nontrivial check because the two computations proceed from distinct starting points: one solves the field theory flow equation for the spectrum, while the other extracts charges from the gravitational side. We will revise the manuscript to explicitly display the field-theoretic flow equation alongside the holographic definition and add a clarifying paragraph on their independence. revision: yes
Circularity Check
No circularity: proposal and consistency check remain independent
full rationale
The paper proposes mixed boundary conditions as the holographic encoding of stress-tensor deformations and then performs an explicit test in Kerr-dS3/CFT2 by comparing conserved charges from the holographic stress tensor against the spectrum from an independent field-theoretic flow equation. This agreement is presented as a nontrivial check rather than a definitional identity. No self-definitional steps, fitted inputs renamed as predictions, or load-bearing self-citations appear in the derivation chain; the field-theoretic side is external to the bulk construction. The central claim therefore retains independent content and does not reduce to its inputs by construction.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption dS/CFT correspondence holds semiclassically
Reference graph
Works this paper leans on
-
[1]
Strominger, The dS/CFT correspondence, JHEP 10 (2001) 034, arXiv:hep-th/0106113
A. Strominger, The dS/CFT correspondence, JHEP 10 (2001) 034, arXiv:hep-th/0106113
Pith/arXiv arXiv 2001
-
[2]
Witten, Quantum gravity in de Sitter space,arXiv:hep-th/0106109
E. Witten, Quantum gravity in de Sitter space,arXiv:hep-th/0106109
-
[3]
V. Balasubramanian, J. de Boer, and D. Minic, Mass, entropy and holography in asymptotically de Sitter spaces, Phys. Rev. D 65 (2002) 123508, arXiv:hep-th/0110108
Pith/arXiv arXiv 2002
-
[4]
Klemm, Some aspects of the de Sitter / CFT correspondence, Nucl
D. Klemm, Some aspects of the de Sitter / CFT correspondence, Nucl. Phys. B 625 (2002) 295–311,arXiv:hep-th/0106247
Pith/arXiv arXiv 2002
-
[5]
V. Balasubramanian, J. de Boer, and D. Minic, Notes on de Sitter space and holography, Class. Quant. Grav. 19 (2002) 5655–5700,arXiv:hep-th/0207245
Pith/arXiv arXiv 2002
-
[6]
Anninos, De Sitter Musings, Int
D. Anninos, De Sitter Musings, Int. J. Mod. Phys. A 27 (2012) 1230013, arXiv:1205.3855
arXiv 2012
-
[7]
J. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models, JHEP 05 (2003) 013,arXiv:astro-ph/0210603
Pith/arXiv arXiv 2003
-
[8]
D. Harlow and D. Stanford, Operator Dictionaries and Wave Functions in AdS/CFT and dS/CFT,arXiv:1104.2621. 28
-
[9]
A. B. Zamolodchikov, Expectation value of composite field T anti-T in two-dimensional quantum field theory,arXiv:hep-th/0401146
-
[10]
F. A. Smirnov and A. B. Zamolodchikov, On space of integrable quantum field theories, Nucl. Phys. B 915 (2017) 363–383,arXiv:1608.05499
Pith/arXiv arXiv 2017
-
[11]
A. Cavagli` a, S. Negro, I. M. Sz´ ecs´ enyi, and R. Tateo,T¯T-deformed 2D Quantum Field Theories, JHEP 10 (2016) 112,arXiv:1608.05534
Pith/arXiv arXiv 2016
-
[12]
Jiang, A pedagogical review on solvable irrelevant deformations of 2D quantum field theory, Commun
Y. Jiang, A pedagogical review on solvable irrelevant deformations of 2D quantum field theory, Commun. Theor. Phys. 73 no. 5, (2021) 057201,arXiv:1904.13376
arXiv 2021
-
[13]
S. He, Y. Li, H. Ouyang, and Y. Sun,T Tdeformation: Introduction and some recent advances, Sci. China Phys. Mech. Astron. 68 no. 10, (2025) 101001, arXiv:2503.09997
arXiv 2025
-
[14]
L. McGough, M. Mezei, and H. Verlinde, Moving the CFT into the bulk withT ¯T, JHEP 04 (2018) 010,arXiv:1611.03470
Pith/arXiv arXiv 2018
-
[15]
P. Kraus, J. Liu, and D. Marolf, Cutoff AdS 3 versus theT Tdeformation, JHEP 07 (2018) 027,arXiv:1801.02714
Pith/arXiv arXiv 2018
-
[16]
M. Guica and R. Monten,T ¯Tand the mirage of a bulk cutoff, SciPost Phys. 10 (2021) 024,arXiv:1906.11251
arXiv 2021
-
[17]
Taylor,T ¯Tdeformations in general dimensions, Adv
M. Taylor,T ¯Tdeformations in general dimensions, Adv. Theor. Math. Phys. 27 no. 1, (2023) 37–63,arXiv:1805.10287
Pith/arXiv arXiv 2023
-
[18]
G. Bonelli, N. Doroud, and M. Zhu,T ¯T-deformations in closed form, JHEP 06 (2018) 149,arXiv:1804.10967
Pith/arXiv arXiv 2018
-
[19]
H. Babaei-Aghbolagh, K. Babaei Velni, D. Mahdavian Yekta, and H. Mohammadzadeh, Marginal TT¯-like deformation and modified Maxwell theories in two dimensions, Phys. Rev. D 106 no. 8, (2022) 086022,arXiv:2206.12677
arXiv 2022
- [20]
-
[21]
H. Babaei-Aghbolagh, K. Babaei Velni, D. M. Yekta, and H. Mohammadzadeh,T T-like flows in non-linear electrodynamic theories and S-duality, JHEP 04 (2021) 187, arXiv:2012.13636
arXiv 2021
-
[22]
H. Babaei-Aghbolagh, S. He, T. Morone, H. Ouyang, and R. Tateo, Geometric Formulation of Generalized Root-TT¯Deformations, Phys. Rev. Lett. 133 no. 11, (2024) 111602,arXiv:2405.03465. 29
arXiv 2024
- [23]
- [24]
- [25]
- [26]
-
[27]
X.-Y. Ran, F. Hao, and M. Yamada, Geometric realization via irrelevant deformations induced by the stress-energy tensor, Phys. Rev. D 111 no. 8, (2025) 085033, arXiv:2410.02537
arXiv 2025
-
[28]
T. Morone and R. Tateo, Solutions to the Ricci Flow via Einstein Field Equations, arXiv:2411.10265
- [29]
-
[30]
X.-Y. Ran, F. Hao, and H. Ouyang, Holography for stress-energy tensor flows, Phys. Rev. D 112 no. 8, (2025) L081905,arXiv:2508.12275
arXiv 2025
-
[31]
A. Lewkowycz, J. Liu, E. Silverstein, and G. Torroba,T Tand EE, with implications for (A)dS subregion encodings, JHEP 04 (2020) 152,arXiv:1909.13808
arXiv 2020
-
[32]
V. Gorbenko, E. Silverstein, and G. Torroba, dS/dS andT T, JHEP 03 (2019) 085, arXiv:1811.07965
Pith/arXiv arXiv 2019
-
[33]
Shyam, T T + Λ 2 deformed CFT on the stretched dS 3 horizon, JHEP 04 (2022) 052,arXiv:2106.10227
V. Shyam, T T + Λ 2 deformed CFT on the stretched dS 3 horizon, JHEP 04 (2022) 052,arXiv:2106.10227
arXiv 2022
-
[34]
E. Coleman, E. A. Mazenc, V. Shyam, E. Silverstein, R. M. Soni, G. Torroba, and S. Yang, De Sitter microstates from T T+ Λ 2 and the Hawking-Page transition, JHEP 07 (2022) 140,arXiv:2110.14670
arXiv 2022
-
[35]
Torroba,T T+ Λ 2 from a 2d gravity path integral, JHEP 01 (2023) 163, arXiv:2212.04512
G. Torroba,T T+ Λ 2 from a 2d gravity path integral, JHEP 01 (2023) 163, arXiv:2212.04512
arXiv 2023
- [36]
-
[37]
D. Chen, X. Jiang, and H. Yang, Holographic TT¯deformed entanglement entropy in dS3/CFT2, Phys. Rev. D 109 no. 2, (2024) 026011,arXiv:2307.04673
arXiv 2024
-
[38]
S. E. Aguilar-Gutierrez, A. Svesko, and M. R. Visser, T T deformations from AdS 2 to dS2, JHEP 01 (2025) 120,arXiv:2410.18257
arXiv 2025
- [39]
- [40]
-
[41]
Narayan, Extremal surfaces in de Sitter spacetime, Phys
K. Narayan, Extremal surfaces in de Sitter spacetime, Phys. Rev. D 91 no. 12, (2015) 126011,arXiv:1501.03019
Pith/arXiv arXiv 2015
-
[42]
Narayan, de Sitter space and extremal surfaces for spheres, Phys
K. Narayan, de Sitter space and extremal surfaces for spheres, Phys. Lett. B 753 (2016) 308–314,arXiv:1504.07430
Pith/arXiv arXiv 2016
-
[43]
K. Doi, J. Harper, A. Mollabashi, T. Takayanagi, and Y. Taki, Pseudoentropy in dS/CFT and Timelike Entanglement Entropy, Phys. Rev. Lett. 130 no. 3, (2023) 031601,arXiv:2210.09457
arXiv 2023
-
[44]
Narayan, de Sitter space, extremal surfaces, and time entanglement, Phys
K. Narayan, de Sitter space, extremal surfaces, and time entanglement, Phys. Rev. D 107 no. 12, (2023) 126004,arXiv:2210.12963
arXiv 2023
- [45]
-
[46]
A. Mollabashi, N. Shiba, T. Takayanagi, K. Tamaoka, and Z. Wei, Pseudo Entropy in Free Quantum Field Theories, Phys. Rev. Lett. 126 no. 8, (2021) 081601, arXiv:2011.09648
arXiv 2021
-
[47]
A. Mollabashi, N. Shiba, T. Takayanagi, K. Tamaoka, and Z. Wei, Aspects of pseudoentropy in field theories, Phys. Rev. Res. 3 no. 3, (2021) 033254, arXiv:2106.03118
arXiv 2021
-
[48]
K. Doi, J. Harper, A. Mollabashi, T. Takayanagi, and Y. Taki, Timelike entanglement entropy, JHEP 05 (2023) 052,arXiv:2302.11695
arXiv 2023
-
[49]
Mukherjee, Pseudo Entropy in U(1) gauge theory, JHEP 10 (2022) 016, arXiv:2205.08179
J. Mukherjee, Pseudo Entropy in U(1) gauge theory, JHEP 10 (2022) 016, arXiv:2205.08179. 31
arXiv 2022
-
[50]
Z.-X. Zhao, L. Zhao, and S. He, Timelike entanglement entropy in higher curvature gravity, JHEP 12 (2025) 156,arXiv:2509.04181
arXiv 2025
- [51]
-
[52]
Park, Statistical entropy of three-dimensional Kerr-de Sitter space, Phys
M.-I. Park, Statistical entropy of three-dimensional Kerr-de Sitter space, Phys. Lett. B 440 (1998) 275–282,arXiv:hep-th/9806119
Pith/arXiv arXiv 1998
-
[53]
I. R. Klebanov and E. Witten, AdS / CFT correspondence and symmetry breaking, Nucl. Phys. B 556 (1999) 89–114,arXiv:hep-th/9905104
Pith/arXiv arXiv 1999
-
[54]
Witten, Multitrace operators, boundary conditions, and AdS/CFT correspondence, arXiv:hep-th/0112258
E. Witten, Multitrace operators, boundary conditions, and AdS/CFT correspondence, arXiv:hep-th/0112258
-
[55]
M. Berkooz, A. Sever, and A. Shomer, Double trace deformations, boundary conditions and space-time singularities, JHEP 05 (2002) 034,arXiv:hep-th/0112264
Pith/arXiv arXiv 2002
-
[56]
Mueck, An Improved correspondence formula for AdS / CFT with multitrace operators, Phys
W. Mueck, An Improved correspondence formula for AdS / CFT with multitrace operators, Phys. Lett. B 531 (2002) 301–304,arXiv:hep-th/0201100
Pith/arXiv arXiv 2002
-
[57]
S. S. Gubser and I. R. Klebanov, A Universal result on central charges in the presence of double trace deformations, Nucl. Phys. B 656 (2003) 23–36,arXiv:hep-th/0212138
Pith/arXiv arXiv 2003
-
[58]
T. Hartman and L. Rastelli, Double-trace deformations, mixed boundary conditions and functional determinants in AdS/CFT, JHEP 01 (2008) 019, arXiv:hep-th/0602106
Pith/arXiv arXiv 2008
-
[59]
D. E. Diaz and H. Dorn, Partition functions and double-trace deformations in AdS/CFT, JHEP 05 (2007) 046,arXiv:hep-th/0702163
Pith/arXiv arXiv 2007
-
[60]
I. Papadimitriou, Multi-Trace Deformations in AdS/CFT: Exploring the Vacuum Structure of the Deformed CFT, JHEP 05 (2007) 075,arXiv:hep-th/0703152
Pith/arXiv arXiv 2007
-
[61]
S. S. Gubser, I. R. Klebanov, and A. M. Polyakov, Gauge theory correlators from noncritical string theory, Phys. Lett. B 428 (1998) 105–114,arXiv:hep-th/9802109
Pith/arXiv arXiv 1998
-
[62]
Witten, Anti de Sitter space and holography, Adv
E. Witten, Anti de Sitter space and holography, Adv. Theor. Math. Phys. 2 (1998) 253–291,arXiv:hep-th/9802150
Pith/arXiv arXiv 1998
- [63]
-
[64]
G. Jorjadze and S. Theisen, Canonical maps and integrability in T¯T deformed 2d CFTs.,arXiv:2001.03563. 32
arXiv 2001
-
[65]
F. Ben´ ıtez, G. Hern´ andez-Chifflet, and E. Mato, Canonical analysis of the gravitational description of the TT¯deformation, Phys. Rev. D 113 no. 4, (2026) 046015, arXiv:2401.00068
arXiv 2026
-
[66]
D. Anninos, S. A. Hartnoll, and D. M. Hofman, Static Patch Solipsism: Conformal Symmetry of the de Sitter Worldline, Class. Quant. Grav. 29 (2012) 075002, arXiv:1109.4942
Pith/arXiv arXiv 2012
-
[67]
R. Nakayama, The World-Line Quantum Mechanics Model at Finite Temperature which is Dual to the Static Patch Observer in de Sitter Space, Prog. Theor. Phys. 127 (2012) 393–408,arXiv:1112.1267
Pith/arXiv arXiv 2012
-
[68]
P. Rodr´ ıguez, D. Tempo, and R. Troncoso, Mapping relativistic to ultra/non-relativistic conformal symmetries in 2D and finite √ T Tdeformations, JHEP 11 (2021) 133,arXiv:2106.09750
arXiv 2021
-
[69]
Fefferman and C
C. Fefferman and C. R. Graham, Conformal invariants, in ´Elie Cartan et les math´ ematiques d’aujourd’hui - Lyon, 25-29 juin 1984, no. S131 in Ast´ erisque, pp. 95–116. Soci´ et´ e math´ ematique de France, 1985
1984
-
[70]
M. Banados, C. Teitelboim, and J. Zanelli, The Black hole in three-dimensional space-time, Phys. Rev. Lett. 69 (1992) 1849–1851,arXiv:hep-th/9204099
Pith/arXiv arXiv 1992
-
[71]
M. Banados, M. Henneaux, C. Teitelboim, and J. Zanelli, Geometry of the (2+1) black hole, Phys. Rev. D 48 (1993) 1506–1525,arXiv:gr-qc/9302012. [Erratum: Phys.Rev.D 88, 069902 (2013)]
Pith/arXiv arXiv 1993
-
[72]
Banados, Three-dimensional quantum geometry and black holes, AIP Conf
M. Banados, Three-dimensional quantum geometry and black holes, AIP Conf. Proc. 484 no. 1, (1999) 147–169,arXiv:hep-th/9901148
Pith/arXiv arXiv 1999
-
[73]
M. Henningson and K. Skenderis, The Holographic Weyl anomaly, JHEP 07 (1998) 023,arXiv:hep-th/9806087
Pith/arXiv arXiv 1998
-
[74]
K. Skenderis and S. N. Solodukhin, Quantum effective action from the AdS / CFT correspondence, Phys. Lett. B 472 (2000) 316–322,arXiv:hep-th/9910023
Pith/arXiv arXiv 2000
-
[75]
S. de Haro, S. N. Solodukhin, and K. Skenderis, Holographic reconstruction of spacetime and renormalization in AdS/CFT, Commun. Math. Phys. 217 (2001) 595–622,arXiv:hep-th/0002230
Pith/arXiv arXiv 2001
-
[76]
J. D. Brown and J. W. York, Jr., Quasilocal energy and conserved charges derived from the gravitational action, Phys. Rev. D 47 (1993) 1407–1419,arXiv:gr-qc/9209012
Pith/arXiv arXiv 1993
-
[77]
G. W. Gibbons and S. W. Hawking, Cosmological Event Horizons, Thermodynamics, and Particle Creation, Phys. Rev. D 15 (1977) 2738–2751. 33
1977
-
[78]
S. Datta and Y. Jiang,T ¯Tdeformed partition functions, JHEP 08 (2018) 106, arXiv:1806.07426
Pith/arXiv arXiv 2018
-
[79]
O. Aharony, S. Datta, A. Giveon, Y. Jiang, and D. Kutasov, Modular invariance and uniqueness ofT ¯Tdeformed CFT, JHEP 01 (2019) 086,arXiv:1808.02492
Pith/arXiv arXiv 2019
-
[80]
S. Chakraborty, A. Giveon, and D. Kutasov,T T, black holes and negative strings, JHEP 09 (2020) 057,arXiv:2006.13249
arXiv 2020
discussion (0)
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