60 citations · 680 across the 50 of their papers we have counts for
49 papers · 1 filter
A fermion primer
Loriano Bonora, Roberto Soldati
This is a review paper intended to illustrate a few critical issues concerning Dirac, Weyl and Majorana fermions and their differences. The first part consists in basic introductio…
Elusive anomalies
L. Bonora
Usually, in order to compute an anomaly (be it chiral or trace) with a perturbative method, the lowest significant order is sufficient. With the help of gauge or diffeomorphism inv…
BRST and superfield formalism. A review
L. Bonora, R. P. Malik
This article, which is a review with substantial original material, is meant to offer a comprehensive description of the superfield representations of the BRST and anti-BRST algebr…
Perturbative and non-pertrubative trace anomalies
Loriano Bonora
We study the definition of trace anomalies for models of Dirac and Weyl fermions coupled to a metric and a gauge potential. While in the non-perturbative case the trace anomaly is…
HS Yang-Mills-like models: a review
L. Bonora, S. Giaccari
We review the attempt to construct massless gauge field theories in Minkowski spacetime that go under the name of HS-YM. We present their actions and their symmetries. We motivate…
Supersymmetric HS Yang-Mills-like models
Loriano Bonora, Stefano Giaccari
We introduce the supersymmetric version of YM-like theories with infinitely many spin fields in 4 dimension. The construction is carried out via the superfield method. The surprisi…
Dirac, Majorana, Weyl in 4d
L. Bonora, R. Soldati, S. Zalel
This is a review of some elementary properties of Dirac, Weyl and Majorana spinors in 4d. We focus in particular on the differences between massless Dirac and Majorana fermions, on…
On the trace anomaly for Weyl fermions
Loriano Bonora, Roberto Soldati
This note is a comment on some recent papers that have raised a controversy about the existence of the odd-parity trace anomaly in a four-dimensional theory of Weyl fermions. Witho…
HS in flat spacetime. YM-like models
L. Bonora, M. Cvitan, P. Dominis Prester +2
We introduce and analyse a few examples of massless higher spin theories in Minkowski spacetime. They are defined in terms of master fields, i.e. fields defined in the whole phase…
Axial gravity: a non-perturbative approach to split anomalies
L. Bonora, M. Cvitan, P. Dominis Prester +3
In a theory of a Dirac fermion field coupled to a metric-axial-tensor (MAT) background, using a Schwinger-DeWitt heat kernel technique, we compute non-perturbatively the two (odd p…
Worldline quantization of field theory, effective actions and structure
L. Bonora, M. Cvitan, P. Dominis Prester +3
We formulate the worldline quantization of a massive fermion model coupled to external higher spin sources. We use the relations obtained in this way to show that its regularized e…
One-loop effective actions and higher spins. II
L. Bonora, M. Cvitan, P. Dominis Prester +2
In this paper we continue and improve the analysis of the effective actions obtained by integrating out a scalar and a fermion field coupled to external symmetric sources, started…
One-loop effective actions and higher spins
L. Bonora, M. Cvitan, P. Dominis Prester +3
The idea we advocate in this paper is that the one-loop effective action of a free (massive) field theory coupled to external sources (via conserved currents) contains complete inf…
Massive fermion model in 3d and higher spin currents
L. Bonora, M. Cvitan, P. Dominis Prester +2
We analyze the 3d free massive fermion theory coupled to external sources. The presence of a mass explicitly breaks parity invariance. We calculate two- and three-point functions o…
Pure contact term correlators in CFT
Loriano Bonora, Bruno Lima de Souza
We discuss the case of correlators in CFT made of pure contact terms, without a corresponding bare part. We show two examples. The first is provided by the conformal limits of a fr…
Regularization of energy-momentum tensor correlators and parity-odd terms
Loriano Bonora, Antonio Duarte Pereira, Bruno Lima de Souza
We discuss the problem of regularizing correlators in conformal field theories. The only way to do it in coordinate space is to interpret them as distributions. Unfortunately excep…
Comments on lump solutions in SFT
Loriano Bonora, Driba D. Tolla
We analyze a recently proposed scheme to construct analytic lump solutions in open SFT. We argue that in order for the scheme to be operative and guarantee background independence…
Generalized q-deformed Correlation Functions as Spectral Functions of Hyperbolic Geometry
L. Bonora, A. A. Bytsenko, M. E. X. Guimarães
We analyse the role of vertex operator algebra and 2d amplitudes from the point of view of the representation theory of infinite dimensional Lie algebras, MacMahon and Ruelle funct…
Trace anomalies in chiral theories revisited
Loriano Bonora, Stefano Giaccari, Bruno Lima de Souza
Motivated by the search for possible CP violating terms in the trace of the energy-momentum tensor in theories coupled to gravity we revisit the problem of trace anomalies in chira…
Symmetries and gravitational Chern-Simons Lagrangian terms
Loriano Bonora, Maro Cvitan, Predrag Dominis Prester +2
We consider some general consequences of adding pure gravitational Chern-Simons term to manifestly diff-covariant theories of gravity. Extending the result of a previous paper we e…
Generalized states in SFT
Loriano Bonora, Stefano Giaccari
The search for analytic solutions in open string fields theory à la Witten often meets with singular expressions, which need an adequate mathematical formalism to be interpreted. I…
Stationary rotating black holes in theories with gravitational Chern-Simons Lagrangian term
Loriano Bonora, Maro Cvitan, Predrag Dominis Prester +2
We study the effects of introducing purely gravitational Chern-Simons Lagrangian terms in ordinary Einstein gravity on stationary rotating black hole solutions and on the associate…
Gravitational Chern-Simons terms and black hole entropy. Global aspects
L. Bonora, M. Cvitan, P. Dominis Prester +2
We discuss the topological and global gauge properties of the formula for a black hole entropy due to a purely gravitational Chern-Simons term. We study under what topological and…
String Partition Functions, Hilbert Schemes, and Affine Lie Algebra Representations on Homology Groups
Loriano Bonora, Andrey Bytsenko, Emilio Elizalde
This review paper contains a concise introduction to highest weight representations of infinite dimensional Lie algebras, vertex operator algebras and Hilbert schemes of points, to…