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Lorentz invariance and quantum gravity: an additional fine-tuning problem?

- J. Collins, Alejandro Perez, D. Sudarsky, L. Urrutia, H. Vucetich
- Physics, Medicine
- Physical review letters
- 12 March 2004

Trying to combine standard quantum field theories with gravity leads to a breakdown of the usual structure of space time at around the Planck length, 1.6x10(-35) m, with possible violations of… Expand

Loop quantum gravity and light propagation

- J. Alfaro, H. A. Morales-T'ecotl, L. Urrutia
- Physics
- 9 August 2001

Within loop quantum gravity we construct a coarse-grained approximation for the Einstein-Maxwell theory that yields effective Maxwell equations in flat spacetime comprising Planck scale corrections.… Expand

On the inverse problem of the calculus of variations

- S. Hojman, L. Urrutia
- Mathematics
- 1 September 1981

We consider the inverse problem of the calculus of variations for any system by writing its differential equations of motion in first‐order form. We provide a way of constructing infinitely many… Expand

Relativity and Gravitation: Classical and Quantum. SILARG VII

- J. D'Olivo, E. Nahmad-Achar, M. Rosenbaum, M. P. Ryan, L. Urrutia, F. Zertuche
- Physics
- 1991

Quantum gravity and spin-1/2 particle effective dynamics

- J. Alfaro, H. Morales‐Técotl, L. Urrutia
- Physics
- 27 August 2002

Quantum gravity phenomenology opens up the possibility of probing Planck scale physics. Thus, by exploiting the generic properties that a semiclassical state of the compound system fermions plus… Expand

The Itzykson–Zuber integral for U(m‖n)

- J. Alfaro, R. Medina, L. Urrutia
- Mathematics, Physics
- 2 December 1994

The Itzykson–Zuber (IZ) integral is computed for the superunitary group U(m‖n). As a consequence, the nonzero correlations of superunitary matrices can be found.

Corrections to Flat-Space Particle Dynamics Arising from Space Granularity

- L. Urrutia
- Physics
- 24 June 2005

The construction of effective Hamiltonians describing corrections to flat space particle dynamics arising from the granularity of space at very short distances is discussed in the framework of an… Expand

Zeroth-order eikonal approximation in relativistic charged-particle--magnetic-monopole scattering

- L. Urrutia
- Physics
- 15 October 1978

The relativistic spin-1/2 charged-particle--magnetic-monopole scattering is considered in the high-energy, low-momentum-transfer limit. Under these circumstances the differential cross section is… Expand

The orthogonality relations for the supergroup U(m/n)

- J. Alfaro, R. Medina, L. Urrutia
- Mathematics, Physics
- 12 May 1995

Starting from the generalization of the Itzykson-Zuber integral for U(m/n) we study the orthogonality relations for this supergroup.

Vacuum polarization in parallel homogeneous electric and magnetic fields

- L. Urrutia
- Physics
- 15 April 1978

The lowest-order mass operator for a real or virtual photon propagating in an arbitrary direction with respect to parallel homogeneous external electric and magnetic fields is calculated to all… Expand

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