Flatspace chiral supergravity

Bagchi, Arjun; Basu, Rudranil; Detournary, Stéphane; Parekh, Pulastya

doi:10.1103/physrevd.97.106020

Cited by 12 publications

(12 citation statements)

References 69 publications

(151 reference statements)

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“…Not only is the underlying algebra (SGCA I ) more non-trivial than the previous version of the tensionless superstring (SGCA H ), it also has some very desirable features. The SGCA I contains a Supervirasoro sub-algbera, unlike the SGCA H , and one can perform a truncation of the SGCA I down to this subalgebra in the case where the central charge c M vanishes [14,27]. The bosonic version of this feature [20] has been recently used in the context of the ambitwistor string to explain the chiral nature of the theory [28].…”

Section: Discussionmentioning

confidence: 99%

Exotic origins of tensionless superstrings

et al. 2020

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A new type of tensionless superstring theory, called the Inhomogeneous tensionless superstring, has been recently introduced. This is characterised by a residual symmetry algebra on the worldsheet richer in structure than the previous known symmetry algebra related to Homogeneous tensionless superstring. In this paper, we attribute "nice" properties, including hermiticity of the generators of this larger symmetry algebra, and investigate the theory of tensile superstring that the Inhomogeneous tensionless superstring could arise from. The nature of the limit is such that the parent tensile theory is generically anti-hermitian and hence rather exotic in nature. We provide two different avenues to account for this anti-hermiticity.

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Section: Discussionmentioning

confidence: 99%

Exotic origins of tensionless superstrings

et al. 2020

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“…If, however, we venture beyond Einstein gravity, there are interesting holographic duals to this theory.See[65] for the bosonic theory and[66] for a recent fermionic generalisation.…”

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confidence: 99%

BMS characters and modular invariance

Bagchi

Saha

Zodinmawia

2019

J. High Energ. Phys.

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We construct the characters for the highest weight representations of the 3d Bondi-Metzner-Sachs (BMS 3 ) algebra. We reproduce our character formula by looking at singular limits from 2d CFT characters and find that our answers are identical to the characters obtained for the very different induced representations. We offer an algebraic explanation to this arising from an automorphism in the parent 2d CFT. We then use the characters to construct the partition function and show how to use BMS modular transformations to obtain a density of primary states. The entropy thus obtained accounts for the principal part of the entropy obtained from the BMS-Cardy formula. This suggests that BMS primaries capture most of the entropy of Flat Space Cosmologies, which are the flatspace analogues of BTZ black holes in AdS 3 .

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“…The conjecture of CS gravity with asymptotically flat boundary conditions being dual a chiral half of a 2d CFT is known as the Flatspace Chiral Gravity conjecture [33]. For some further work on this, the reader is referred to [77][78][79].…”

Section: Jhep07(2021)101mentioning

confidence: 99%

BMS field theories and Weyl anomaly

Bagchi

Dutta

Kolekar

et al. 2021

J. High Energ. Phys.

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Two dimensional field theories with Bondi-Metzner-Sachs symmetry have been proposed as duals to asymptotically flat spacetimes in three dimensions. These field theories are naturally defined on null surfaces and hence are conformal cousins of Carrollian theories, where the speed of light goes to zero. In this paper, we initiate an investigation of anomalies in these field theories. Specifically, we focus on the BMS equivalent of Weyl invariance and its breakdown in these field theories and derive an expression for Weyl anomaly. Considering the transformation of partition functions under this symmetry, we derive a Carrollian Liouville action different from ones obtained in the literature earlier.

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Flatspace chiral supergravity

Cited by 12 publications

References 69 publications

Exotic origins of tensionless superstrings

Exotic origins of tensionless superstrings

BMS characters and modular invariance

BMS field theories and Weyl anomaly

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