353 citations · 4.3k across the 67 of their papers we have counts for
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Double Copy from the Flipped Null String
Arjun Bagchi, Sachin Grover, Sharang Rajesh Iyer +2
We study the double-copy structure of tree amplitudes of the bosonic null string in the flipped vacuum. We show that its level-one vector correlator supplies the Cachazo-He-Yuan (C…
Scattering of Null strings - Flipped Vacuum & CHY
Arjun Bagchi, Sachin Grover, Sharang Rajesh Iyer +2
We investigate the scattering of null tensionless strings. Classical null strings, given by the ILST action, give rise to three distinct quantum theories built on different vacua a…
Doubly-scaled planar SYM & Carroll Holography
Arjun Bagchi, Prateksh Dhivakar, Alok Laddha +1
In their seminal paper, Okuda and Penedones (OP) put forward an intriguing proposal towards holography in asymptotically flat spacetimes (AFS). They showed that the flat space limi…
Carrollian ABJM: Fermions and Supersymmetry
Arjun Bagchi, Arthur Lipstein, Saikat Mondal +1
A natural approach for constructing a concrete example of flat space holography is to take the flat space limit of a well-understood example of AdS/CFT, such as the one relating M-…
High energy scattering and null strings
Arjun Bagchi, Sachin Grover, Sharang Rajesh Iyer +1
We propose an instrinsic worldsheet description of the ultra-high energy regime of string scattering based on worldsheet symmetries. At very high energies, the fundamental string b…
Black hole Near Horizons through the Looking Glass
Arjun Bagchi, Arkachur Bhattacharya, Sharang Rajesh Iyer +1
We show that the near horizon of a generic non-extremal black hole (BH) can be understood in terms of a Carrollian geometry with two null directions, also called a String-Carroll (…
Boundary Carroll CFTs: SUSY and Superstrings
Arjun Bagchi, Shankhadeep Chakrabortty, Pronoy Chakraborty +2
We consider two dimensional superconformal Carrollian theories with boundaries and construct two variants of the Boundary Superconformal Carrollian Algebra (BSCCA), viz. the Homoge…
Universal sectors of two-dimensional Carrollian CFTs
Ankit Aggarwal, Arjun Bagchi, Stephane Detournay +3
We revisit modular invariance in two-dimensional Carrollian conformal field theories from a geometric perspective. Focusing on the characters of the induced and highest-weight repr…
Boundary Carrollian CFTs and Open Null Strings
Arjun Bagchi, Pronoy Chakraborty, Shankhadeep Chakrabortty +3
We consider Carrollian conformal field theories in two dimensions and construct the boundary Carrollian conformal algebra (BCCA), opening up innumerable possibilities for further s…
3D Stress Tensor for Gravity in 4D Flat Spacetime
Arjun Bagchi, Prateksh Dhivakar, Sudipta Dutta
Three dimensional (3d) Carrollian CFTs are potential co-dimension one holographic duals of 4d asymptotically flat spacetimes that live on the whole of the null boundary. In this pa…
Anatomy of Null Contractions
Arjun Bagchi, Nachiketh M, Pushkar Soni
We introduce null contractions of the Poincare and relativistic conformal algebras. The longitudinal null contraction involves writing the algebra in lightcone coordinates and cont…
Holography in Flat Spacetimes: the case for Carroll
Arjun Bagchi, Prateksh Dhivakar, Sudipta Dutta
We compare and contrast the two approaches of holography in asymptotically flat spacetimes, viz. the co-dimension two Celestial approach based on the Mellin transformation and the…
BMS modular covariance and structure constants
Arjun Bagchi, Saikat Mondal, Sanchari Pal +1
Two-dimensional (2d) field theories invariant under the Bondi-Metzner-Sachs algebra, or 2d BMSFTs in short, are putative holographic duals of Einstein gravity in 3d asymptotically…
AdS Witten Diagrams to Carrollian Correlators
Arjun Bagchi, Prateksh Dhivakar, Sudipta Dutta
Carrollian Conformal Field Theories (CFTs) have been proposed as co-dimension one holographic duals to asymptotically flat spacetimes as opposed to Celestial CFTs which are co-dime…
Carrollian Origins of Bjorken Flow
Arjun Bagchi, Kedar S. Kolekar, Ashish Shukla
Bjorken flow is among the simplest models of fluids moving near the speed of light () while Carroll symmetry arises as a contraction of Poincaré group when . We show th…
Non-Lorentzian Kač-Moody Algebras
Arjun Bagchi, Ritankar Chatterjee, Rishabh Kaushik +2
We investigate two dimensional (2d) quantum field theories which exhibit Non- Lorentzian Kač-Moody (NLKM) algebras as their underlying symmetry. Our investigations encompass both 2…
Magic Fermions: Carroll and Flat Bands
Arjun Bagchi, Aritra Banerjee, Rudranil Basu +2
The Carroll algebra is constructed as the limit of the Poincare algebra and is associated to symmetries on generic null surfaces. In this paper, we begin investigations of…
Horizon Strings as 3d Black Hole Microstates
Arjun Bagchi, Daniel Grumiller, M. M. Sheikh-Jabbari
We propose that 3d black holes are an ensemble of tensionless null string states. These microstates typically have non-zero winding. We evaluate their partition function in the lim…
BMS Field Theories with Symmetry
Arjun Bagchi, Ritankar Chatterjee, Rishabh Kaushik +3
We investigate quantum field theories in two dimensions (2d) with an underlying Bondi-van der Burgh-Metzner-Sachs (BMS) symmetry augmented by currents. These fiel…
Boosting to BMS
Arjun Bagchi, Aritra Banerjee, Hisayoshi Muraki
Bondi-Metzner-Sachs (BMS) symmetries, or equivalently Conformal Carroll symmetries, are intrinsically associated to null manifolds and in two dimensions can be obtained as an In{ö}…
Carroll covariant scalar fields in two dimensions
Arjun Bagchi, Aritra Banerjee, Sudipta Dutta +2
Conformal Carroll symmetry generically arises on null manifolds and is important for holography of asymptotically flat spacetimes, generic black hole horizons and tensionless strin…
Scattering Amplitudes: Celestial and Carrollian
Arjun Bagchi, Shamik Banerjee, Rudranil Basu +1
Recent attempts at the construction of holography for asymptotically flat spacetimes have taken two different routes. Celestial holography, involving a two dimensional (2d) CFT dua…
Carrollian superconformal theories and super BMS
Arjun Bagchi, Daniel Grumiller, Poulami Nandi
We investigate the supersymmetric versions of Bondi-Metzner-Sachs or, equivalently, conformal Carroll symmetry in boundary dimensions , with applications of flat space hologra…
Galilean Gauge Theories from Null Reductions
Arjun Bagchi, Rudranil Basu, Minhajul Islam +2
The procedure of null reduction provides a concrete way of constructing field theories with Galilean invariance. We use this to examine Galilean gauge theories, viz. Galilean elect…