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- Publications
- Influence

Lattice QCD with a chirally twisted mass term

- R. Frezzotti, P. Grassi, S. Sint, P. Weisz
- Physics
- 30 December 2000

Lattice QCD with Wilson quarks and a chirally twisted mass term represents a promising alternative regularization of QCD, which does not suffer from unphysical fermion zero modes. We show how the… Expand

Comments on 1/16 BPS Quantum States and Classical Configurations

- Lars Grant, P. Grassi, S. Kim, Shiraz Minwalla
- Physics
- 28 March 2008

We formulate the problem of counting 1/16 BPS states of = 4 Yang Mills theory as the enumeration of the local cohomology of an operator acting on holomorphic fields on C2. We study aspects of the… Expand

Simplifying superstring and D-brane actions in AdS4 × CP3 superbackground

- P. Grassi, D. Sorokin, L. Wulff
- Physics
- 31 March 2009

By making an appropriate choice for gauge fixing kappa-symmetry we obtain a relatively simple form of the actions for a D = 11 superparticle in AdS4 × S7/Zk, and for a D0-brane, fundamental string… Expand

Covariant one-loop amplitudes in D=11

- Lilia Anguelova, P. Grassi, P. Vanhove
- Physics
- 22 August 2004

Abstract We generalize to the eleven-dimensional superparticle Berkovits' prescription for loop computations in the pure spinor approach to covariant quantization of the superstring. Using these ten-… Expand

Practical Algebraic Renormalization

- P. Grassi, T. Hurth, M. Steinhauser
- Physics
- 20 July 1999

Abstract A practical approach is presented which allows the use of a non-invariant regularization scheme for the computation of quantum corrections in perturbative quantum field theory. The… Expand

Covariant Quantization of Superstrings Without Pure Spinor Constraints

- P. Grassi, G. Policastro, M. Porrati, P. Nieuwenhuizen
- Physics
- 18 December 2001

We construct a covariant quantum superstring, extending Berkovits' approach by introdu\-cing new ghosts to relax the pure spinor constraints. The central charge of the underlying Kac-Moody algebra,… Expand

A local formulation of lattice QCD without unphysical fermion zero modes

- R. Frezzotti, P. Grassi, S. Sint, P. Weisz
- Physics
- 1 September 1999

The problem of unphysical zero modes in lattice QCD with Wilson fermions can be solved in a clean way by including a mass term proportional to iψγ5τ3ψ in the standard lattice theory with Nf = 2 mass… Expand

Gauge and topological symmetries in the bulk quantization of gauge theories

- L. Baulieu, P. Grassi, D. Zwanziger
- Physics
- 12 March 2001

Abstract A gauge theory with 4 physical dimensions can be consistently expressed as a renormalizable topological quantum field theory in 5 dimensions. We extend the symmetries in the 5-dimensional… Expand

On projections to the pure spinor space

- Pietro Antonio Grassi, Sebastian Guttenberg
- Physics, Mathematics
- 13 September 2011

A bstractA family of covariant non-linear projections from the space of SO(10) Weyl spinors onto the space of pure SO(10) Weyl spinors is presented. The Jacobian matrices of these projections are… Expand

Renormalization of non-semisimple gauge models with the background field method

- P. Grassi
- Physics
- 28 August 1999

Abstract We study the renormalization of non-semisimple gauge models quantized in the 't Hooft-background gauge to all orders. We analyze the normalization conditions for masses and couplings… Expand