String field theory
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Nonrelativistic strings and limits of the AdS/CFT correspondence Open
Using target space null reduction of the Polyakov action we find a novel\ncovariant action for strings moving in a torsional Newton-Cartan geometry.\nSending the string tension to zero while rescaling the Newton-Cartan clock\n1-form, so as…
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algebras and field theory Open
We review and develop the general properties of algebras focusing on the gauge structure of the associated field theories. Motivated by the homotopy Lie algebra of closed string field theory and the work of Roytenberg and Weinstein describ…
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Cutkosky rules for superstring field theory Open
Superstring field theory expresses the perturbative S-matrix of superstring theory as a sum of Feynman diagrams each of which is manifestly free from ultraviolet divergences. The interaction vertices fall off exponentially for large space-…
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On the null origin of the ambitwistor string Open
In this paper we present the null string origin of the ambitwistor string.\nClassically, the null string is the tensionless limit of string theory, and so\ntoo is the Ambitwistor string. Both have as constraint algebra the Galilean\nConfor…
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Shadows of 5D black holes from string theory Open
We study the shadow behaviors of five dimensional (5D) black holes embedded in type IIB superstring/supergravity inspired spacetimes by considering solutions with and without rotations. Geometrical properties as shapes and sizes are analyz…
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Heterotic and bosonic string amplitudes via field theory Open
A bstract Previous work has shown that massless tree amplitudes of the type I and IIA/B superstrings can be dramatically simplified by expressing them as double copies between field-theory amplitudes and scalar disk/sphere integrals, the l…
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Real-time dynamics of string breaking in quantum spin chains Open
String breaking is a central dynamical process in theories featuring confinement, where a string connecting two charges decays at the expense of the creation of new particle-antiparticle pairs. Here, we show that this process can also be o…
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Higher-Loop Amplitude Monodromy Relations in String and Gauge Theory Open
The monodromy relations in string theory provide a powerful and elegant formalism to understand some of the deepest properties of tree-level field theory amplitudes, like the color-kinematics duality. This duality has been instrumental in …
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String Universality and Non-Simply-Connected Gauge Groups in 8D Open
We present a consistency condition for 8D N=1 supergravity theories with nontrivial global structure G/Z for the non-Abelian gauge group, based on an anomaly involving the Z 1-form center symmetry. The interplay with other swampland criter…
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Factorization of chiral string amplitudes Open
We re-examine a closed-string model defined by altering the boundary\nconditions for one handedness of two-dimensional propagators in\notherwise-standard string theory. We evaluate the amplitudes using\nKawai-Lewellen-Tye factorization int…
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Burg-Metzner-Sachs symmetry, string theory, and soft theorems Open
We study the action of the BMS group in critical, bosonic string theory\nliving on a target space of the form $\\mathbb{M}^{d}\\times C$. Here $M^{d}$ is\n$d$-dimensional (asymptotically) flat spacetime and $C$ is an arbitrary\ncompactific…
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Mean string field theory: Landau-Ginzburg theory for 1-form symmetries Open
By analogy with the Landau-Ginzburg theory of ordinary zero-form symmetries, we introduce and develop a Landau-Ginzburg theory of one-form global symmetries, which we call mean string field theory. The basic dynamical variable is a string …
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Twisted supergravity and its quantization Open
Twisted supergravity is supergravity in a background where the bosonic ghost field takes a non-zero value. This is the supergravity counterpart of the familiar concept of twisting supersymmetric field theories. In this paper, we give conje…
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String theory of supertubes Open
String theory on AdS3 backgrounds arises as an IR limit of Little String Theory on NS5-branes. A wide variety of holographic RG flows from the fivebrane theory in the UV to (orbifolds of) AdS3 in the IR is amenable to exact treatment in wo…
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Holomorphic Anomaly and Quantum Mechanics Open
We show that the all-orders WKB periods of one-dimensional quantum mechanical oscillators are governed by the refined holomorphic anomaly equations of topological string theory. We analyze in detail the double-well potential and the cubic …
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Chaotic scattering of highly excited strings Open
A bstract Motivated by the desire to understand chaos in the S -matrix of string theory, we study tree level scattering amplitudes involving highly excited strings. While the amplitudes for scattering of light strings have been a hallmark …
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Computational complexity of vacua and near-vacua in field and string theory Open
We demonstrate that the problems of finding stable or metastable vacua in a low energy effective field theory requires solving nested NP-hard and co-NP-hard problems, while the problem of finding near-vacua is in P. Multiple problems relev…
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Non-tachyonic semi-realistic non-supersymmetric heterotic-string vacua Open
\n The heterotic-string models in the free fermionic formulation gave rise to some of the most realistic-string models to date, which possess $$N=1$$ spacetime supersymmetry. Lack of evidence for supersymmetry at the LHC instigated recent …
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One loop mass renormalization of unstable particles in superstring theory Open
Most of the massive states in superstring theory are expected to undergo mass renormalization at one loop order. Typically these corrections should contain imaginary parts, indicating that the states are unstable against decay into lighter…
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Tensionless Path from Closed to Open Strings Open
We reconsider the tensionless limit on bosonic closed string theory, where the 3D Bondi-Metzner-Sachs (BMS) algebra appears as symmetries on the world sheet, as opposed to two copies of the Virasoro algebra in the case of the usual tensile…
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Double field theory as the double copy of Yang-Mills theory Open
We show that double field theory arises from the color-kinematic double copy of Yang-Mills theory. A precise double copy prescription for the Yang-Mills action at quadratic and cubic order is provided that yields the double field theory ac…
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String Amplitudes from Field-Theory Amplitudes and Vice Versa Open
We present an integration-by-parts reduction of any massless tree-level string correlator to an equivalence class of logarithmic functions, which can be used to define a field-theory amplitude via a Cachazo-He-Yuan (CHY) formula. The strin…
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String field theory as world-sheet UV regulator Open
A bstract Even at tree level, the first quantized string theory suffers from apparent short distance singularities associated with collision of vertex operators that prevent us from straightforward numerical computation of various quantiti…
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String correlators on AdS3: four-point functions Open
A bstract We propose a closed-form formula for genus 0 four-point functions in AdS 3 string theory with pure NS-NS flux including arbitrary amounts of spectral flow. Our formula passes many non-trivial consistency checks and has intriguing…
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Strings in Ramond-Ramond backgrounds from the Neveu-Schwarz-Ramond formalism Open
A bstract We treat RR flux backgrounds of type II string theory in the framework of closed superstring field theory based on the NSR formalism, focusing on two examples: (1) the pp-wave background supported by 5-form flux, and (2) AdS 3 × …
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Poisson equation for the Mercedes diagram in string theory at genus one Open
The Mercedes diagram has four trivalent vertices which are connected by six\nlinks such that they form the edges of a tetrahedron. This three loop Feynman\ndiagram contributes to the D^{12} R^4 amplitude at genus one in type II string\nthe…
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Subsubleading soft theorems of gravitons and dilatons in the bosonic string Open
Starting from the amplitude with an arbitrary number of massless closed states of the bosonic string, we compute the soft limit when one of the states becomes soft to subsubleading order in the soft momentum expansion, and we show that whe…
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Rindler Physics on the String Worldsheet Open
We construct the tensionless limit of bosonic string theory in terms of a family of worldsheets with increasing acceleration and show that the null string emerges in the limit of infinite acceleration when the Rindler horizon is hit. We di…
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Intrinsic non-commutativity of closed string theory Open
We show that the proper interpretation of the cocycle operators appearing in the physical vertex operators of compactified strings is that the closed string target is noncommutative. We track down the appearance of this non-commutativity t…
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Hyperbolic geometry and closed bosonic string field theory. Part I. The string vertices via hyperbolic Riemann surfaces Open
A bstract The main geometric ingredient of the closed string field theory are the string vertices, the collections of string diagrams describing the elementary closed string interactions, satisfying the quantum Batalian-Vilkovisky master e…