Emission models for soft gamma-ray Repeaters/Anomalous X-ray pulsars described as ...
Study of the Galactic Center region and searches for dark matter signals with gamm...
| Grant number: | 13/15088-0 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctorate |
| Effective date (Start): | March 01, 2015 |
| Effective date (End): | April 22, 2018 |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics |
| Principal Investigator: | Jose Carlos Neves de Araujo |
| Grantee: | Jaziel Goulart Coelho |
| Host Institution: | Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovações (Brasil). São José dos Campos , SP, Brazil |
| Associated research grant: | 13/26258-4 - Superdense matter in the universe, AP.TEM |
Abstract From the point of view of fundamental physics, compact objects are very important, because they have strong gravity, high magnetic fields and huge densities, are perhaps the only way to study physics under extreme conditions. Among these objects, the class named Anomalous X-ray pulsars (AXPs) and Soft gamma-ray repeaters (SGRs) are some of the most interesting groups of pulsars that have been intensively studied in recent years. They are usually seen as neutron stars with super strong magnetic fields, $B\gtrsim10^{14}$ G. However, two SGRs with low magnetic field $B\sim(10^{12}-10^{13})$ G were detected. Besides, white dwarfs pulsars (AB) too have also been observed. These new discoveries have opened the discussion of the nature of SGRs/AXPs, emerging alternative scenarios, in particular, the white dwarf pulsar model, fast and highly magnetized in an attempt to explain the observational characteristics of some SGRs/AXPs. In this new description several observational features are easy understood and well explained as a consequence of the large radius of a massive white dwarf that manifests a new scale of mass density, moment of inertia, rotational energy, and magnetic dipole momentum incomparison with the case of neutron stars. In this project, we will discuss these massive fast rotating highly magnetized white dwarfsas belonging to a new class of very massive white dwarfs with a core of strange quark matter, beyond the investigation of emission of gravitational waves generated by the oscillation during the transition from hadronic matter to quark matter or asymmetries generated by the high magnetic field combined with the effects of rotation of the star. In light of these recent astronomical observations and theoretical models for strange quark matter, this project aims at a better understanding the true nature of SGRs/AXPs: they are really magnetars ormassive, very fast, and strange white dwarfs? | |
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