The charge carriers in graphene are massless Dirac fermions and exhibit a relativistic Landau-level quantization in a magnetic field. Recently, it has been reported that, without any external magnetic field, quantized energy levels have been also observed from strained graphene nanobubbles on a platinum surface, which were attributed to the Landau levels of massless Dirac fermions in graphene f...

We investigate the conditions for obtaining four-dimensional massless spin-2 states in the spectrum of fluctuations around an asymptotically AdS5 solution of EinsteinDilaton gravity. We find it is only possible to have normalizable massless spin-2 modes if the space-time terminates at some IR point in the extra dimension, far from the UV AdS boundary, and if suitable boundary conditions are imp...

We have calculated the next-to-leading order cross section for the inclusive production of charm quarks as a function of the transverse momentum pT and the rapidity in two approaches using massive or massless charm quarks. For the singleresolved cross section we have derived the massless limit from the massive theory. We find that this limit differs from the genuine massless version with MS fac...

We consider the phenomenological implications of a soft SUSY breaking term B̃N at the TeV scale (here B̃ is the U(1)Y gaugino and N is the right-handed neutrino field). In models with a massless (or nearly massless) neutralino, such a term will give rise through the see-saw mechanism to new contributions to the mass matrix of the light neutrinos. We treat the massless neutralino as an (almost) st...

We show that the boson field representation of the massless fermion fields, suggested by Morchio, Pierotti and Strocchi in J. Math. Phys. 33, 777 (1992) for the operator solution of the massless Thirring model, agrees completely with the existence of the chirally broken phase in the massless Thirring model revealed in EPJC 20, 723 (2001) and hep–th/0112183, when the free massless boson fields a...

We study the heterotic string on the simplest (non-trivial) Calabi-Yau man-ifold, K3, and its orbifold limits. We set the background gauge connection equal to the spin connection. The massless spectrum of the field theory that is the low energy limit of the Es @ Es string is derived on K3. Some terms in the effective Lagrangian for the massless modes are shown to be determined by the topology o...

Abstract To understand the mechanism of the fermion pair and fermion-antifermion pair condensation,existence of the solutions of Bethe-Salpeter equation in QED3 is examined.In the ladder appoximation our solution for the axialscalar is consistent with Ward-Takahashi-identity for the axial vector currents.In addition to massless psedoscalar fermion-antifermion (fa) system there exists solutions ...

We investigate representations of the conformal group that describe “massless” particles in the interior and at the boundary of anti-de Sitter space. It turns out that massless gauge excitations in anti-de Sitter are gauge “current” operators at the boundary. Conversely, massless excitations at the boundary are topological singletons in the interior. These representations lie at the threshold o...

We consider the quantization of the massless minimally coupled scalar field in de Sitter spacetime. The no-boundary Euclidean prescription naturally picks out the de Sitter invariant vacuum state of Kirsten and Garriga. We extend Strominger’s dS/CFT correspondence to this case which allows us to interpret the massless field in terms of a Euclidean CFT. The extension is nontrivial and requires c...

Abstract I review some aspects of BPS magnetic monopoles and of electric-magnetic duality in theories with arbitrary gauge groups. When the symmetry is maximally broken to a U(1)r subgroup, all magnetically charged configurations can be understood in terms of r species of massive fundamental monopoles. When the unbroken group has a non-Abelian factor, some of these fundamental monopoles become ...