Thursday, May 21, 2009
Rides to Albuquerque Thread
Driving to ALB? Add a comment below on what time you will be going to find riders. Need a ride at a certain time? Add a comment below giving the time you need to leave.
Homework Problems
Chuck began the discussion of homework.
* Multi-dimensional models for X-ray bursts. --> Connects nuclear experiment directly to astrophysical observer, the most distant line this community needs to cross. HS suggests the nuclear physics remains uncertain for multi-dimensional model, and therefore must pinned down.
* Lots of phenomenology from many different angles (define? what's an angle? - crust cooling, X-ray bursts, and code-to-code comparisons of X-ray bursts. BENCHMARK CASES with identical physics. This will be important with phase plots of NS mass and radius, with different constraints from different phenomena, one wants to be sure that the inputs at the microphysical level are identical.
*FYI: At Michael Smith's repository at nucastrodata.org, the whole community has access to the same primary dataset -- this is intended to act as a benchmark.
* FYIDuncan Galloway's X-ray burst lightcurve repository is a resource for the modeling community.
* Modelling the crust: is it amorphous or crystaline, and do magnetic field evolution affect the the crust. A model of the magnetic field evolution with amorphous conductivity, to see if the crust blows up.
* Make magnetic field evolution models a community resource.
* FYI: European Compstar will provide codes for students for neutron structures, NS rotation, supernova hydrodynamical codes.
* FYI: JINA has a series of schools, dedicated to giving away R-matrix code to analyse reaction codes; some network codes; shell model.
* Wiki for this conference.
* Who are all these people? What do they do? How do I know who does what? It seems important to see the expertise in the field in a plainer way.
* The Wasserman Question: Where are the condensed matter people in all this? For example, they have been working with rotation in superfluid 3He for some time, they must be able to inform our understanding of rotation in neutron stars. We need to do outreach to condensed matter physicists, who study superfluidity and strong magnetic fields in matter, because they were not represented at this workshop.
* Gravitational work will continue to grow in importance to neutron stars. We should be embedding them with us, as soon as possible.
* Multi-dimensional models for X-ray bursts. --> Connects nuclear experiment directly to astrophysical observer, the most distant line this community needs to cross. HS suggests the nuclear physics remains uncertain for multi-dimensional model, and therefore must pinned down.
* Lots of phenomenology from many different angles (define? what's an angle? - crust cooling, X-ray bursts, and code-to-code comparisons of X-ray bursts. BENCHMARK CASES with identical physics. This will be important with phase plots of NS mass and radius, with different constraints from different phenomena, one wants to be sure that the inputs at the microphysical level are identical.
*FYI: At Michael Smith's repository at nucastrodata.org, the whole community has access to the same primary dataset -- this is intended to act as a benchmark.
* FYIDuncan Galloway's X-ray burst lightcurve repository is a resource for the modeling community.
* Modelling the crust: is it amorphous or crystaline, and do magnetic field evolution affect the the crust. A model of the magnetic field evolution with amorphous conductivity, to see if the crust blows up.
* Make magnetic field evolution models a community resource.
* FYI: European Compstar will provide codes for students for neutron structures, NS rotation, supernova hydrodynamical codes.
* FYI: JINA has a series of schools, dedicated to giving away R-matrix code to analyse reaction codes; some network codes; shell model.
* Wiki for this conference.
* Who are all these people? What do they do? How do I know who does what? It seems important to see the expertise in the field in a plainer way.
* The Wasserman Question: Where are the condensed matter people in all this? For example, they have been working with rotation in superfluid 3He for some time, they must be able to inform our understanding of rotation in neutron stars. We need to do outreach to condensed matter physicists, who study superfluidity and strong magnetic fields in matter, because they were not represented at this workshop.
* Gravitational work will continue to grow in importance to neutron stars. We should be embedding them with us, as soon as possible.
At Crust09: on the roof
It's near the end of the morning coffee break on Thursday, and the workshop is almost done. Seems we're still enjoying it.
Victoria Kaspi: Anomalous X-ray Pulsars
Vicky kicked off the fourth and final day of the workshop by reviewing the observational properties of anomalous X-ray pulsars (AXPs). AXPs form a class of highly magnetized neutron stars, denoted as magnetars, together with soft gamma repeaters (SGRs).
Vicky showed the results of phase-coherent timing studies of 5 AXPs (SGRs are too faint to detect with RXTE when not bursting or flaring) using a long-term monitoring program with the RXTE satellite.
The AXPs appear to display many glitches; sudden spin-up events that may be explained by a faster rotating crustal superfluid suddenly transferring angular momentum to the crust. Glitch studies can possibly help to constrain the superfluid properties of neutron stars. The AXP glitches are rather peculiar compared to those observed from rotation powered pulsars and sometimes result in a net spin-down rather than an increase in the spin period.
Check out the online magnetar catalog if you are looking for information on one of the AXPs or SGRs.
In Santa Fe: Another night at the pool
Credit: Erik KuulkersGosh, doesn't he play pool like he does science?!
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