Γεώργιος Παπαθανασίου, Charles B. Thorn · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2013
We develop new more powerful techniques, based on an almost closed form for the lattice worldsheet propagator, for analyzing planar open string worldsheets defined on a lightcone lattice. We show that results obtained in earlier work are easily reproduced with far more precision. In particular, consistency checks that required numerical analysis in the earlier work can now be confirmed exactly.
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Jan de Boer, Viktor Jahnke, Keun-Young Kim et al. · arXiv (Cornell University) · 2022
We construct worldsheet traversable wormholes by considering the effects of a double-trace deformation, $δ\mathcal{L}\sim h\partialϕ_L\partialϕ_R$, coupling the endpoints of an open string in AdS space. The operator deforming the theory is irrelevant and makes the boundaries bend inward toward the IR. This effect, reminiscent of two-dimensional dilaton gravities, renders the teleportation protocol more efficient and facilitates the transfer of information between the members of the dual Bell pair. We compare our results with those obtained with the standard double-trace deformation, $δ\mathcal{L}\sim hϕ_Lϕ_R$, introduced by Gao, Jafferis and Wall.
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Kamani, Davoud · arXiv (Cornell University) · 2000
In this paper we consider the worldsheet of superstring as a noncommutative space. Some additional terms can be added to the superstring action, such that for ordinary worldsheet they are zero. Expansion of this extended action up to the first order of the noncommutativity parameter, leads to the new supersymmetric action for string. For the closed superstring, we obtain the boundary state that describes a brane. From the open string point of view, the new boundary conditions on the worldsheet bosons, generalize the noncommutativity of spacetime. Finally, we suggest some definitions for the noncommutativity parameter of superstring worldsheet.
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V. Gorbenko · Springer theses · 2016
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Jan de Boer, Viktor Jahnke, Keun-Young Kim et al. · Journal of High Energy Physics · 2023
A bstract We construct worldsheet traversable wormholes by considering the effects of a double-trace deformation, $$ \delta \mathcal{L}\sim h\partial {\phi}_L\partial {\phi}_R $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>δ</mml:mi> <mml:mi>L</mml:mi> <mml:mo>∼</mml:mo> <mml:mi>h</mml:mi> <mml:mi>∂</mml:mi> <mml:msub> <mml:mi>ϕ</mml:mi> <mml:mi>L</mml:mi> </mml:msub> <mml:mi>∂</mml:mi> <mml:msub> <mml:mi>ϕ</mml:mi> <mml:mi>R</mml:mi> </mml:msub> </mml:math> , coupling the endpoints of an open string in AdS space. The operator deforming the theory is irrelevant and makes the boundaries bend inward toward the IR. This effect, reminiscent of two-dimensional dilaton gravities, renders the teleportation protocol more efficient and facilitates the transfer of information between the members of the dual Bell pair. We compare our results with those obtained with the standard double-trace deformation, $$ \delta \mathcal{L}\sim h{\phi}_L{\phi}_R $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>δ</mml:mi> <mml:mi>L</mml:mi> <mml:mo>∼</mml:mo> <mml:mi>h</mml:mi> <mml:msub> <mml:mi>ϕ</mml:mi> <mml:mi>L</mml:mi> </mml:msub> <mml:msub> <mml:mi>ϕ</mml:mi> <mml:mi>R</mml:mi> </mml:msub> </mml:math> , introduced by Gao, Jafferis and Wall.
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Gautason, Fridrik · CERN Document Server (European Organization for Nuclear Research) · 2023
Worldsheet instantons in holography.<br /> <br /> 0:00:00 Slide 1<br /> 0:01:05 Slide 2<br /> 0:02:05 Slide 3<br /> 0:03:09 Slide 4<br /> 0:04:50 Slide 5<br /> 0:08:10 Slide 6<br /> 0:10:25 Slide 7<br /> 0:11:37 Slide 8<br /> 0:13:13 Slide 9<br /> 0:14:33 Slide 10<br /> 0:17:13 Slide 11<br /> 0:20:18 Slide 12<br /> 0:22:50 Slide 13<br /> 0:24:15 Slide 14<br /> 0:25:42 Slide 15<br /> 0:27:18 Slide 16<br /> 0:28:49 Slide 17<br /> 0:29:55 Slide 18<br /> 0:31:13 Slide 19<br /> 0:34:07 Slide 20<br /> 0:36:24 Slide 21<br /> 0:37:29 Slide 22<br /> 0:38:50 Slide 23<br /> 0:41:14 Slide 24<br /> 0:42:59 Slide 25<br /> 0:44:49 Slide 26<br /> 0:46:58 Slide 27<br /> 0:48:21 Slide 28<br /> 0:49:29 Slide 29<br /> 0:50:36 Slide 30
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Correlators In Ads/cft, Justin R. David∗a, Rajesh Gopakumarb et al. · 2016
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Alfredo Guevara, Ben Maybee, Alexander Ochirov et al. · Journal of High Energy Physics · 2021
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Wei Li · arXiv (Cornell University) · 2023
The chiral algebra of a 4D $N\geq2$ superconformal field theory is a vertex operator algebra generated by the Schur subsector of the 4D theory and its rigid (yet rich) structure has been useful in constraining and classifying 4D N=2 SCFTs. We study how the chiral algebra arises from the worldsheet perspective. In the worldsheet CFT dual of 4D N=4 SYM at the free point, we extract the subsector that corresponds to the spacetime Schur operators at generic coupling, and show how they generate the chiral algebra. The result can be easily generalized to 4D N=2 superconformal field theories that arise as orbifolds of 4D N=4 SYM.
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Ochirov, A, O’Connell, D, Guevara, A et al. · Oxford University Research Archive (ORA) (University of Oxford) · 2021
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Bagchi, Arjun, Chakrabortty, Shankhadeep, Parekh, Pulastya · arXiv (Cornell University) · 2015
We revisit the construction of the tensionless limit of closed bosonic string theory in the covariant formulation in the light of Galilean conformal symmetry that rises as the residual gauge symmetry on the tensionless worldsheet. We relate the analysis of the fundamentally tensionless theory to the tensionless limit that is viewed as a contraction of worldsheet coordinates. Analysis of the quantum regime uncovers interesting physics. The degrees of freedom that appear in the tensionless string are fundamentally different from the usual string states. Through a Bogoliubov transformation on the worldsheet, we link the tensionless vacuum to the usual tensile vacuum. As an application, we show that our analysis can be used to understand physics of strings at very high temperatures and propose that these new degrees of freedom are naturally connected with the long-string picture of the Hagedorn phase of free string theory. We also show that tensionless closed strings behave like open strings.
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Komatsu, Shota, Maity, Pronobesh · ArXiv.org · 2025
We present a worldsheet action that reproduces a class of dual resonance amplitudes discussed in the literature, which generalize the Veneziano amplitude for open strings. Our proposal builds on the chiral composite linear dilaton introduced recently. We further compute higher-point extensions and closed-string analogs, which exhibit partial crossing symmetry.
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Tim Adamo · Journal of High Energy Physics · 2014
We study the multiparticle factorization properties of two worldsheet theories which — at tree-level — describe the scattering of massless particles in four dimensions: the Berkovits-Witten twistor-string for $ \mathcal{N} $ = 4 super-Yang-Mills coupled to $ \mathcal{N} $ = 4 conformal supergravity, and the Skinner twistor-string for $ \mathcal{N} $ = 8 supergravity. By considering these string-like theories, we can study factorization at the level of the worldsheet before any Wick contractions or integrals have been performed; this is much simpler than considering the factorization properties of the amplitudes themselves. In Skinner’s twistor-string this entails the addition of worldsheet gravity as well as a formalism that represents all external states in a manifestly symmetric way, which we develop explicitly at genus zero. We confirm that the scattering amplitudes of Skinner’s theory, as well as the gauge theory amplitudes for the planar sector of the Berkovits-Witten theory, factorize appropriately at genus zero. In the non-planar sector, we find behavior indicative of conformal gravity in the Berkovits-Witten twistor-string. We contrast factorization in twistor-strings with the story in ordinary string theory, and also make some remarks on higher genus factorization and disconnected prescriptions.
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Yoav Zigdon · arXiv (Cornell University) · 2026
I provide multiple examples of conformal field theories (CFTs) on the worldsheet that describe string propagation in target space wormholes connecting two disjoint asymptotic manifolds. The worldsheet approach goes beyond the framework of supergravity by incorporating wormholes for which the size of the throat is comparable to the string scale. Typically, strongly coupled CFTs describe these stringy wormholes, which include Euclidean wormholes, double cones, and Einstein-Rosen bridges. Finally, I interpret a conformal manifold that contains $\text{SU}(2)_k$ and $\big(\text{SU}(2)_k \times \text{U}(1)_{k'}\big)/\text{U}(1)$ CFTs as mediating a transition between a closed Universe and a wormhole.
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Simeon Hellerman, Johannes Walcher · ArXiv.org · 2006
We resolve a puzzle in the theory of strings propagating on locally flat spacetimes with nontrivial Wilson lines for stringy Z_N gauge symmetries. We find that strings probing such backgrounds are described by consistent worldsheet CFTs. The level mismatch in the twisted sectors is compensated by adjusting the quantization of momentum of strings winding around the Wilson line direction in units of 1/(N^2 R) rather than 1/(N R), as might have been classically expected. We demonstrate in various examples how this improvement of the naive orbifold prescription leads to satisfaction of general physical principles such as level matching and closure of the OPE. Applying our techniques to construct a Wilson line for T-duality of a torus in the type II string (``T-fold''), we find a new 7D solution with N=1 SUSY where the moduli of the fiber torus are fixed. When the size of the base becomes small this simple monodrofold exhibits enhanced gauge symmetry and a self-T-duality on the S^1 base.
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Lorenz Eberhardt, Sebastian Mizera · SciPost Physics · 2023
We compute the imaginary parts of genus-one string scattering amplitudes. Following Witten’s i\varepsilon <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>i</mml:mi> <mml:mi>ε</mml:mi> </mml:mrow> </mml:math> prescription for the integration contour on the moduli space of worldsheets, we give a general algorithm for computing unitarity cuts of the annulus, Möbius strip, and torus topologies exactly in \alpha' <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>α</mml:mi> <mml:mi>′</mml:mi> </mml:mrow> </mml:math> . With the help of tropical analysis, we show how the intricate pattern of thresholds (normal and anomalous) opening up arises from the worldsheet computation. The result is a manifestly-convergent representation of the imaginary parts of amplitudes, which has the analytic form expected from Cutkosky rules in field theory, but bypasses the need for performing laborious sums over the intermediate states. We use this representation to study various physical aspects of string amplitudes, including their behavior in the (s,t) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mo stretchy="false" form="prefix">(</mml:mo> <mml:mi>s</mml:mi> <mml:mo>,</mml:mo> <mml:mi>t</mml:mi> <mml:mo stretchy="false" form="postfix">)</mml:mo> </mml:mrow> </mml:math> plane, exponential suppression, decay widths of massive strings, total cross section, and low-energy expansions. We find that planar annulus amplitudes exhibit a version of low-spin dominance: at any finite energy, only a finite number of low partial-wave spins give an appreciable contribution to the imaginary part.
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Adsn Sn Superstrings, M. Goykhman, E. Ivanov · 2016
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Per Sundin, Linus Wulff · Journal of High Energy Physics · 2013
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Eric Sharpe, Arthur Greenspoon · AMS/IP studies in advanced mathematics · 2008
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Dubovsky, Sergei · arXiv (Cornell University) · 2018
We study worldsheet theory of confining strings in two-dimensional massive adjoint QCD. Similarly to confining strings in higher dimensions this theory exhibits a non-trivial $S$-matrix surviving even in the strict planar limit. In the process of two-particle scattering a zigzag is formed on the worldsheet. It leads to an interesting non-locality and exhibits some properties of a quantum black hole. Ordinarily, identical quantum particles do not carry identity. On the worldsheet they acquire off-shell identity due to strings attached. Identity implies complementarity. We discuss similarities and differences of the worldsheet scattering with the $T\bar{T}$ deformation. We also propose a promising candidate for a supersymmetric model with integrable confining strings.
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