论文标题
BPS Skyrme中子星在广义重力中
BPS Skyrme neutron stars in generalized gravity
论文作者
论文摘要
我们研究了BPS Skyrme模型描述的核物质耦合到广义重力。具体而言，我们考虑了Starobinsky模型，该模型为Einstein-Hilbert动作提供了领先的校正。对于完整的田间理论和平均场近似，都发现了描述中子星的静态溶液。我们始终使用用于数值中子星计算的适当概括的射击方法，以非扰动方法的方式考虑完整的Starobinsky模型。我们的许多结果类似于使用其他核物质模型对Starobinsky模型的中子星的研究，但是存在一些令人惊讶的差异。与其他研究相反，与表面红移相关的“牛顿质量”与我们模型中的ADM质量大。这种差异与BPS Skyrme模型所描述的核物质特别高的刚度有关，并提供了一种有趣的可能性，可以区分广义重力内的不同核物质模型。
We study the coupling of nuclear matter described by the BPS Skyrme model to generalized gravity. Concretely, we consider the Starobinsky model which provides the leading-order correction to the Einstein-Hilbert action. Static solutions describing neutron stars are found both for the full field theory and for the mean-field approximation. We always consider the full Starobinsky model in the nonperturbative approach, using appropriately generalized shooting methods for the numerical neutron star calculations. Many of our results are similar to previous investigations of neutron stars for the Starobinsky model using other models of nuclear matter, but there are some surprizing discrepancies. The "Newtonian mass" relevant for the surface redshift, e.g., results larger than the ADM mass in our model, in contrast to other investigations. This difference is related to the particularly high stiffness of nuclear matter described by the BPS Skyrme model and offers an interesting possibility to distinguish different models of nuclear matter within generalized gravity.
