output
19922026
researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions
Showing 1995 · gr-qcShow all

26 papers · 2 filters

gr-qc1995★ 4 cited

Coleman-Weinberg SO(10) GUT Theories as Inflationary Models

Giampiero Esposito, Gennaro Miele, Pietro Santorelli

The flat-space limit of the one-loop effective potential for SO(10) GUT theories in spatially flat Friedmann-Robertson-Walker cosmologies is applied to study the dynamics of the ea…

gr-qc1995★ 5 cited

Essential self-adjointness in one-loop quantum cosmology

Giampiero Esposito, Hugo A. Morales-Tecotl, Luis O. Pimentel

The quantization of closed cosmologies makes it necessary to study squared Dirac operators on closed intervals and the corresponding quantum amplitudes. This paper proves self-adjo…

gr-qc1995★ 4 cited

Non-Local Properties in Euclidean Quantum Gravity

Giampiero Esposito

In the one-loop approximation for Euclidean quantum gravity, the boundary conditions which are completely invariant under gauge transformations of metric perturbations involve both…

gr-qc1995★ 1 cited

Linear Form of Canonical Gravity

Giampiero Esposito, Cosimo Stornaiolo

Recent work in the literature has shown that general relativity can be formulated in terms of a jet bundle which, in local coordinates, has five entries: local coordinates on Loren…

gr-qc1995★ 4 cited

Quantum Effects in Friedmann-Robertson-Walker Cosmologies

Giampiero Esposito, Gennaro Miele, Luigi Rosa +1

Electrodynamics for self-interacting scalar fields in spatially flat Friedmann-Robertson-Walker space-times is studied. The corresponding one-loop field equation for the expectatio…

gr-qc1995★ 17 cited

One-loop effective potential for SO(10) GUT theories in de Sitter space

Giampiero Esposito, Gennaro Miele, Luigi Rosa

Zeta-function regularization is applied to evaluate the one-loop effective potential for SO(10) grand-unified theories in de Sitter cosmologies. When the Higgs scalar field belongs…

gr-qc1995★ 3 cited

Twistors in Conformally Flat Einstein Four-Manifolds

Giampiero Esposito, Giuseppe Pollifrone

This paper studies the two-component spinor form of massive spin-3/2 potentials in conformally flat Einstein four-manifolds. Following earlier work in the literature, a non-vanishi…

gr-qc1995★ 5 cited

Spin-3/2 Potentials in Backgrounds with Boundary

Giampiero Esposito, Gabriele Gionti, Alexander Yu. Kamenshchik +2

This paper studies the two-spinor form of the Rarita-Schwinger potentials subject to local boundary conditions compatible with local supersymmetry. The massless Rarita-Schwinger fi…

gr-qc1995★ 20 cited

Mixed Boundary Conditions in Euclidean Quantum Gravity

Giampiero Esposito, Alexander Yu. Kamenshchik

This paper studies a new set of mixed boundary conditions in Euclidean quantum gravity. These involve, in particular, Robin boundary conditions on the perturbed 3-metric and hence…

gr-qc1995★ 3 cited

Alpha Surfaces for Complex Space-Times with Torsion

Giampiero Esposito

This paper studies necessary conditions for the existence of alpha-surfaces in complex space-time manifolds with nonvanishing torsion. For these manifolds, Lie brackets of vector f…

gr-qc1995

Singularity Theory in Classical Cosmology

Giampiero Esposito

This paper compares recent approaches appearing in the literature on the singularity problem for space-times with nonvanishing torsion.

gr-qc1995

Boundary Terms for Massless Fermionic Fields

Giampiero Esposito, Hugo A. Morales-Tecotl, Giuseppe Pollifrone

Local supersymmetry leads to boundary conditions for fermionic fields in one-loop quantum cosmology involving the Euclidean normal to the boundary and a pair of independent spinor…

gr-qc1995★ 1 cited

Lagrangian Theory of Constrained Systems: Cosmological Application

Giampiero Esposito, Gabriele Gionti, Giuseppe Marmo +1

Previous work in the literature has studied the Hamiltonian structure of an R-squared model of gravity with torsion in a closed Friedmann-Robertson-Walker universe. Within the fram…

gr-qc1995★ 10 cited

Self-Dual Action for Fermionic Fields and Gravitation

Hugo A. Morales-Tecotl, Giampiero Esposito

This paper studies the self-dual Einstein-Dirac theory. A generalization is obtained of the Jacobson-Smolin proof of the equivalence between the self-dual and Palatini purely gravi…

gr-qc1995★ 34 cited

Gravitons in One-Loop Quantum Cosmology: Correspondence Between Covariant and Non-Covariant Formalisms

Giampiero Esposito, Alexander Yu. Kamenshchik, Igor V. Mishakov +1

The discrepancy between the results of covariant and non-covariant one-loop calculations for higher-spin fields in quantum cosmology is analyzed. A detailed mode-by-mode study of p…

gr-qc1995★ 4 cited

Local Supersymmetry in One-Loop Quantum Cosmology

Giampiero Esposito

The contribution of physical degrees of freedom to the one-loop amplitudes of Euclidean supergravity is here evaluated in the case of flat Euclidean backgrounds bounded by a three-…

gr-qc1995★ 16 cited

Coulomb Gauge in One-Loop Quantum Cosmology

Giampiero Esposito, Alexander Yu. Kamenshchik

The well-known discrepancies between covariant and non-covariant formalisms in quantum field theory and quantum cosmology are analyzed by focusing on the Coulomb gauge for vacuum M…

gr-qc1995★ 41 cited

Euclidean Maxwell Theory in the Presence of Boundaries. II

Giampiero Esposito, Alexander Yu. Kamenshchik, Igor V. Mishakov +1

Zeta-function regularization is applied to complete a recent analysis of the quantized electromagnetic field in the presence of boundaries. The quantum theory is studied by setting…

gr-qc1995

Spin-Raising Operators and Spin-3/2 Potentials in Quantum Cosmology

Giampiero Esposito, Giuseppe Pollifrone

Local boundary conditions involving field strengths and the normal to the boundary, originally studied in anti-de Sitter space-time, have been recently considered in one-loop quant…

gr-qc1995★ 2 cited

Euclidean Maxwell Theory in the Presence of Boundaries

Giampiero Esposito

This paper describes recent progress in the analysis of relativistic gauge conditions for Euclidean Maxwell theory in the presence of boundaries. The corresponding quantum amplitud…

gr-qc1995★ 2 cited

Boundary Terms in Complex General Relativity

Giampiero Esposito, Cosimo Stornaiolo

A recent analysis of real general relativity based on multisymplectic techniques has shown that boundary terms may occur in the constraint equations, unless some boundary condition…

gr-qc1995★ 31 cited

Spacetime Covariant Form of Ashtekar's Constraints

G. Esposito, C. Stornaiolo, G. Gionti

The Lagrangian formulation of classical field theories and in particular general relativity leads to a coordinate-free, fully covariant analysis of these constrained systems. This…

gr-qc1995★ 84 cited

One-Loop Amplitudes in Euclidean Quantum Gravity

G. Esposito, A. Yu. Kamenshchik, I. V. Mishakov +1

This paper studies the linearized gravitational field in the presence of boundaries. For this purpose, -function regularization is used to perform the mode-by-mode evaluation of…

gr-qc1995★ 19 cited

Relativistic Gauge Conditions in Quantum Cosmology

G. Esposito, A. Yu. Kamenshchik, I. V. Mishakov +1

This paper studies the quantization of the electromagnetic field on a flat Euclidean background with boundaries. One-loop scaling factors are evaluated for the one-boundary and two…