158 citations · 3.2k across the 126 of their papers we have counts for
126 papers
Disorder-free localisation in continuous-time quantum walks : Role of symmetries
A. P. Balachandran, Anjali Kundalpady, Pramod Padmanabhan +1
We investigate the phenomenon of disorder-free localisation in quantum systems with global permutation symmetry. We use permutation group theory to systematically construct permuta…
Confinement and Deconfinement in Gauge Theories: A Quantum Field Theory
A. P. Balachandran
After a brief recount of small and large gauge transformations and the nature of observables, we discuss superselection sectors in gauge theories. There are an infinity of them, cl…
Violation of the Landau-Yang theorem from Infrared Lorentz Symmetry Breaking
M. Asorey, A. P. Balachandran, Arshad Momen +1
Lorentz symmetry forbids decays of massive spin-1 particle like the into two massless photons, a result known as the Landau-Yang theorem. But it is known that infrared effect…
Review of Twisted Poincare Symmetry
A. P. Balachandran, S. Kurkcuoglu, S. Vaidya
This article reviews the construction and some applications of twisted Poincare-covariant quantum fields on the Moyal plane. The Drinfeld twist, which plays a key mathematical role…
Superselection, Boundary Algebras and Duality in Gauge Theories
A. P. Balachandran, V. P. Nair, A. Pinzul +2
We consider the generators of gauge transformations with test functions which do not vanish on the boundary of a spacelike region of interest. These are known to generate the edge…
Uncertainties in Quantum Measurements: A Quantum Tomography
A. P. Balachandran, F. Calderón, V. P. Nair +3
The observables associated with a quantum system form a non-commutative algebra . It is assumed that a density matrix can be determined from the expectation…