118 citations · 487 across the 21 of their papers we have counts for
22 papers
Entanglement entropy in the Long-Range Kitaev chain
F. Ares, J. G. Esteve, F. Falceto +1
In this paper we complete the study on the asymptotic behaviour of the entanglement entropy for Kitaev chains with long range pairing. We discover that when the couplings decay wit…
Equations of Motion as Covariant Gauss Law: The Maxwell-Chern-Simons Case
A. P. Balachandran, Arshad Momen, Amilcar R. de Queiroz
Time-independent gauge transformations are implemented in the canonical formalism by the Gauss law which is not covariant. The covariant form of Gauss law is conceptually important…
Orthogonality catastrophe and fractional exclusion statistics
Filiberto Ares, Kumar S. Gupta, Amilcar R. de Queiroz
We show that the -particle Sutherland model with inverse-square and harmonic interactions exhibits orthogonality catastrophe. For a fixed value of the harmonic coupling, the ove…
Entanglement entropy and Möbius transformations for critical fermionic chains
F. Ares, J. G. Esteve, F. Falceto +1
Entanglement entropy may display a striking new symmetry under Möbius transformations. This symmetry was analysed in our previous work for the case of a non-critical (gapped) free…
On the Möbius transformation in the entanglement entropy of fermionic chains
F. Ares, J. G. Esteve, F. Falceto +1
There is an intimate relation between entanglement entropy and Riemann surfaces. This fact is explicitly noticed for the case of quadratic fermionic Hamiltonians with finite range…
Entanglement in fermionic chains with finite range coupling and broken symmetries
F. Ares, J. G. Esteve, F. Falceto +1
We obtain a formula for the determinant of a block Toeplitz matrix associated with a quadratic fermionic chain with complex coupling. Such couplings break reflection symmetry and/o…
A Matrix Model for QCD
A. P. Balachandran, Sachindeo Vaidya, Amilcar R. de Queiroz
Gribov's observation that global gauge fixing is impossible has led to suggestions that there may be a deep connection between gauge-fixing and confinement. We find an unexpected r…
Entropy from Scaling Symmetry Breaking
Neymar Cavalcante, Saulo Diles, Kumar S. Gupta +1
The scaling symmetry in conformal quantum mechanics (CQM) can be broken due to the boundary conditions that follow from the requirement of a unitary time evolution of the Hamiltoni…
A Matrix Model for QCD: QCD Colour is Mixed
A. P. Balachandran, Amilcar de Queiroz, Sachindeo Vaidya
We use general arguments to show that coloured QCD states when restricted to gauge invariant local observables are mixed. This result has important implications for confinement: a…
Spontaneous Lorentz Violation: The Case of Infrared QED
A. P. Balachandran, S. Kurkcuoglu, A. R. de Queiroz +1
It is by now clear that infrared sector of QED has an intriguingly complex structure. Based on earlier pioneering works on this subject, two of us recently proposed a simple modifi…
Killing Horizons and Spinors
Bruno Carneiro da Cunha, Amilcar de Queiroz
We study the near horizon geometry of generic Killing horizons constructing suitable coordinates and taking the appropriate scaling limit. We are able to show that the geometry wil…
Algebraic Approach to Entanglement and Entropy
A. P. Balachandran, T. R. Govindarajan, Amilcar R. de Queiroz +1
We present a general approach to quantum entanglement and entropy that is based on algebras of observables and states thereon. In contrast to more standard treatments, Hilbert spac…
Quantum Entropic Ambiguities: Ethylene
A. P. Balachandran, Amilcar R. de Queiroz, S. Vaidya
In a quantum system, there may be many density matrices associated with a state on an algebra of observables. For each density matrix, one can compute its entropy. These are in gen…
Renormalization of Noncommutative Quantum Field Theories
Amilcar R. de Queiroz, Rahul Srivastava, Sachindeo Vaidya
We report on a comprehensive analysis of the renormalization of noncommutative ϕ^4 scalar field theories on the Groenewold-Moyal (GM) plane. These scalar field theories are twisted…
Entanglement, Particle Identity and the GNS Construction: A Unifying Approach
A. P. Balachandran, T. R. Govindarajan, Amilcar R. de Queiroz +1
A novel approach to entanglement, based on the Gelfand-Naimark-Segal (GNS) construction, is introduced. It considers states as well as algebras of observables on an equal footing.…
A Dirac type xp-Model and the Riemann Zeros
Kumar S. Gupta, E. Harikumar, Amilcar R. de Queiroz
We propose a Dirac type modification of the xp-model to a $x \slashed{p}$ model on a semi-infinite cylinder. This model is inspired by recent work by Sierra et al on the xp-model o…
Electric Dipole Moment from QCD and How It Vanishes for Mixed States
A. P. Balachandran, T. R. Govindarajan, Amilcar R. de Queiroz
In a previous paper [1], we studied the mass and formulated its chirally symmetric coupling to fermions which induces electric dipole moment (EDM). Here we calculate the EDM t…
Novel Studies on the η' Effective Lagrangian
A. P. Balachandran, T. R. Govindarajan, Amilcar R. de Queiroz
The effective Lagrangian for η' incorporating the effect of the QCD θ-angle has been developed previously. We revisit this Lagrangian and carry out its canonical quantization with…
Quantum Gravity: Mixed States from Diffeomorphism Anomalies
A. P. Balachandran, Amilcar R. de Queiroz
In a previous paper, we discussed simple examples like particle on a circle and molecules to argue that mixed states can arise from anomalous symmetries. This idea was applied to t…
Mixed States from Anomalies
A. P. Balachandran, Amilcar R. de Queiroz
There are several instances where quantum anomalies of continuous and discrete classical symmetries play an important role in fundamental physics. Examples come from chiral anomali…
Lehmann-Symanzik-Zimmermann S-Matrix elements on the Moyal Plane
A. P. Balachandran, Pramod Padmanabhan, Amilcar R. de Queiroz
Field theories on the Groenewold-Moyal(GM) plane are studied using the Lehmann-Symanzik-Zimmermann(LSZ) formalism. The example of real scalar fields is treated in detail. The S-mat…
Kerr-CFT From Black-Hole Thermodynamics
Bruno Carneiro da Cunha, Amilcar R. de Queiroz
We analyze the near-horizon limit of a general black hole with two commuting killing vector fields in the limit of zero temperature. We use black hole thermodynamics methods to rel…