Campus de Gambelas

Aug 14, 2024 | link.aps.org | Robertus Potting |Universidade do Algarve |Campus de Gambelas |Instituto Técnico

In this work we investigate possible actions for antisymmetric two-tensor field models subject to constraints that force the field to acquire a nonzero vacuum expectation value, thereby spontaneously breaking Lorentz invariance. In order to assure stability, we require that the associate Hamiltonian be bounded from below. It is shown that this requirement rules out any quadratic action constructed only from the antisymmetric tensor field.

Aug 28, 2023 | cp.copernicus.org | Universidad de Salamanca |Universidade do Algarve |Campus de Gambelas |Facultad de Ciencias

Research article  |  18 Mar 2024 Research article |  | 18 Mar 2024 Montserrat Alonso-Garcia et al. 1 Introduction During the Quaternary, the Earth's climate oscillated between cold and warm periods due to variations in the planet's orbital parameters that drove the waxing and waning of the ice sheets and the establishment of glacial–interglacial cycles.

Jul 29, 2023 | academic.oup.com | Campus de Gambelas |Ana Torres

Microbial indicators of contamination (Total coliforms, Escherichia coli and Enterococci) were evaluated monthly during September 2018-September 2020, at three study areas (Faro, Olhão, Tavira) under different wastewater discharge flows and hydrodynamic conditions. Additional data on E. coli monitoring in bivalves, available from the national institution responsible for their surveillance was also considered.