Department of Physics: Recent submissions

  • The tensionless path from closed to open strings 
    Banerjee, Aritra (APS, 2019-09)
    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 ...
  • On N-spike strings in conformal gauge with NS-NS fluxes 
    Banerjee, Aritra (Springer, 2019)
    The AdS3 × S3 string sigma model supported both by NS-NS and R-R fluxes has become a well known integrable model, however a putative dual field theory description remains incomplete. We study the anomalous dimensions of ...
  • Cosmography and flat Λ⁢CDM tensions at high redshift 
    Banerjee, Aritra (APS, 2020-12)
    Risaliti, Lusso, and collaborators have constructed a high-redshift Hubble diagram of supernovae (SNe), quasars (QSO), and gamma-ray bursts (GRBs) that shows a “∼4⁢𝜎 tension with the Λ⁢CDM model” based on a log polynomial ...
  • Ehlers transformations as EM duality in the double copy 
    Banerjee, Aritra (APS, 2020-12)
    Given a solution to 4D Einstein gravity with an isometry direction, it is known that the equations of motion are identical to those of a 3D 𝜎 model with target space geometry 𝑆⁢𝑈⁡(1,1)/𝑈⁡(1). Thus, any transformation ...
  • A tale of three — tensionless strings and vacuum structure 
    Banerjee, Aritra (Springer, 2020)
    Within the premise of canonical quantisation, we re-examine the quantum structure of bosonic tensionless string theory. In the classical theory, the worldsheet metric degenerates and the Bondi-Metnzer-Sachs (BMS) algebra ...
  • Hubble sinks in the low-redshift swampland 
    Banerjee, Aritra (APS, 2021)
    Local determinations of the Hubble constant 𝐻0 favor a higher value than Planck based on cosmic microwave background and Λ cold dark matter (Λ⁢CDM). Through a model-independent expansion, we show that low redshift (𝑧≲0.7) ...
  • Rindler Physics on the String Worldsheet 
    Banerjee, Aritra (APS, 2021-01)
    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 ...
  • A Rindler road to Carrollian worldsheets 
    Banerjee, Aritra (Springer, 2022)
    The tensionless limit of string theory has recently been formulated in terms of worldsheet Rindler physics. In this paper, by considering closed strings moving in background Rindler spacetimes, we provide a concrete ...
  • Boosting to BMS 
    Banerjee, Aritra (Springer, 2022-09)
    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 Inönü-Wigner contraction of the two-dimensional ...
  • ModMax meets GCA 
    Banerjee, Aritra (2022-06)
    A maximally symmetric non-linear extension of Maxwell's theory in four dimensions called ModMax has been recently introduced in the literature. This theory preserves both electromagnetic duality and conformal invariance ...
  • Bootstrapping the Kronig-Penney Model 
    Banerjee, Aritra (APS, 2022-12)
    Recently, bootstrap methods from conformal field theory have been adapted for studying the energy spectrum of various quantum mechanical systems. In this paper, we consider the application of these methods in obtaining the ...
  • From CFTs to theories with Bondi-Metzner-Sachs symmetries: Complexity and out-of-time-ordered correlators 
    Banerjee, Aritra (2022-03)
    We probe the contraction from 2d relativistic CFTs to theories with Bondi-Metzner-Sachs (BMS) symmetries, or equivalently Conformal Carroll symmetries, using diagnostics of quantum chaos. Starting from an Ultrarelativistic ...
  • Carroll covariant scalar fields in two dimensions 
    Banerjee, Aritra (Springer, 2023-01)
    Conformal Carroll symmetry generically arises on null manifolds and is important for holography of asymptotically flat spacetimes, generic black hole horizons and tensionless strings. In this paper, we focus on two dimensional ...
  • Magic Fermions: Carroll and Flat Bands 
    Banerjee, Aritra (Springer, 2023-03)
    The Carroll algebra is constructed as the c → 0 limit of the Poincare algebra and is associated to symmetries on generic null surfaces. In this paper, we begin investigations of Carrollian fermions or fermions defined on ...
  • Carroll fermions in two dimensions 
    Banerjee, Aritra (APS, 2023-06)
    Carroll symmetry is a very powerful characteristic of generic null surfaces, as it replaces the usual Poincaré algebra with a vanishing speed of light version thereof. These symmetries have found universal applications in ...
  • Tensionless tales of compactification 
    Banerjee, Aritra (Springer, 2023)
    We study circle compactifications of tensionless bosonic string theory, both at the classical and the quantum level. The physical state condition for different representations of BMS3, the worldsheet residual gauge symmetry ...
  • Quantum state complexity meets many-body scars 
    Banerjee, Aritra (IOP, 2024-01)
    Scar eigenstates in a many-body system refers to a small subset of non-thermal finite energy density eigenstates embedded into an otherwise thermal spectrum. This novel non-thermal behaviour has been seen in recent experiments ...
  • Beyond Wilson? Carroll from current deformations 
    Banerjee, Aritra (Springer, 2024)
    At extreme energies, both low and high, the spacetime symmetries of relativistic quantum field theories (QFTs) are expected to change with Galilean symmetries emerging in the very low energy domain and, as we will argue, ...
  • Tensionless strings in a Kalb-Ramond background 
    Banerjee, Aritra (Springer, 2024)
    We investigate tensionless (or null) bosonic string theory with a Kalb-Ramond background turned on. In analogy with the tensile case, we find that the Kalb-Ramond field has a non-trivial effect on the spectrum only when ...
  • Symmetry resolution in non-Lorentzian field theories 
    Banerjee, Aritra (Springer, 2024)
    Starting from the computation of Symmetry Resolved Entanglement Entropy (SREE) for boosted intervals in a two dimensional Conformal Field Theory, we compute the same in various non-Lorentzian limits, viz, Galilean and ...

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