255 citations
- Instituto de Estructura de la MateriaES7 papers
- Universidad Nacional Autónoma de MéxicoMX5 papers
- Instituto Superior TécnicoPT3 papers
- Physikalisch-Technische BundesanstaltDE3 papers
- University of CoimbraPT3 papers
- Weizmann Institute of ScienceIL3 papers
- Consejo Superior de Investigaciones CientíficasES2 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di MilanoIT2 papers
- Odesa I. I. Mechnikov National UniversityUA2 papers
- Universidad de ZaragozaES2 papers
- University of PotsdamDE2 papers
- Centro Médico Sanitas ZaragozaES1 paper
8 papers · 1 filter
Extremes of multivariate ARMAX processes
Marta Ferreira, Helena Ferreira
We define a new multivariate time series model by generalizing the ARMAX process in a multivariate way. We give conditions on stationarity and analyze local dependence and domains…
Uniqueness of the Fock quantization of scalar fields in spatially flat cosmological spacetimes
Laura Castelló Gomar, Jerónimo Cortez, Daniel Martín-de Blas +2
We study the Fock quantization of scalar fields in (generically) time dependent scenarios, focusing on the case in which the field propagation occurs in --either a background or ef…
Extremal behavior of pMAX processes
Helena Ferreira, Marta Ferreira
The well-known M4 processes of Smith and Weissman are very flexible models for asymptotically dependent multivariate data. Extended M4 of Heffernan \emph{et al.} allows to also acc…
Stable weakly shadowable volume-preserving systems are volume-hyperbolic
Mario Bessa, Manseob Lee, Sandra Vaz
We prove that any C1-stably weakly shadowable volume-preserving diffeomorphism defined on a compact manifold displays a dominated splitting E + F. Moreover, both E and F are volume…
Lorentz Symmetry in QFT on Quantum Bianchi I Space-Time
Andrea Dapor, Jerzy Lewandowski, Yaser Tavakoli
We develop the quantum theory of a scalar field on LQC Bianchi I geometry. In particular, we focus on single modes of the field: the evolution equation is derived from the quantum…
Estimating the Upcrossings Index
João Renato Sebastião, Ana Paula Martins, Helena Ferreira +1
For stationary sequences, under general local and asymptotic dependence restrictions, any limiting point process for time normalized upcrossings of high levels is a compound Poisso…