太阳运动通过Milky Way对宇宙学常数的人择约束
Anthropic constraints on the cosmological constant from Sun's motion through the Milky Way
摘要：
我们尝试性地研究了在银河系尺度下宇宙学常数（CC）Λ对太阳在银河系中运动（MW）的影响（-4.5 <= t <=0 Gyr）。特别是，我们在修改其运动方程的数值积分结束时研究了太阳位移的银心距离，以便也包括Λ的影响。根据目前对银河系宜居带（GHZ）恒星形成所需的金属丰度水平的看法，它将我们的恒星在诞生时放置在距离银河系中心（GC）超过10 kpc的位置的值被认为是不可信的。此外，由于太多邻近的超新星（SN）爆炸和伽马射线暴（GRB）对生命演化的风险，产生太接近GC的值也应该被排除在外。我们研究了MW模型参数和太阳初始条件的不确定性对我们结果的影响，特别是哈勃参数H_0和本地标准静止（LSR）速度Θ_0分别精确到2%和6.2%的水平。当H_0=70.1 km s^-1 Mpc^-1，Θ_0=254 km s^-1，且Λ<= 10^-55 cm^-2时，太阳的诞生地位于距GC 19.6 kpc处，而当H_0和Λ的值相同，且Θ_0 ^max =270 km s^-1时，太阳的诞生地可能位于距银河中心8.5 kpc处。当Λ= 10^-54 cm^-2和Λ= 10^-53 cm^-2时，太阳的位置分别为10.6 kpc和18.7 kpc。
英文摘要：
We tentatively look at anthropic constraints on the Cosmological Constant (CC) Λat galactic scales by investigating its influence on the motion of the Sun throughout the Milky Way (MW) for -4.5 <= t <=0 Gyr. In particular, we look at the Galactocentric distance at which the Sun is displaced at the end of the numerical integration of its equations of motion modified in order to include the effect of Λas well. Values of it placing our star at its birth at more than 10 kpc from the Galactic center (GC) are to be considered implausible, according to the current views on the Galactic Habitable Zone (GHZ) on the metallicity level needed for stars' formation. Also values yielding too close approaches to GC should be excluded because of the risks to life's evolution coming from too much nearby supernovae (SN) explosions and Gamma Ray Bursts (GRB). We investigate the impact on our results of the uncertainties on both the MW model's parameters and the Sun's initial conditions, in particular the Hubble parameter H_0 and the Local Standard Rest (LSR) speed Θ_0 accurate at 2% and 6.2% level, respectively. While H_0=70.1 km s^-1 Mpc^-1, Θ_0=254 km s^-1 and Λ<= 10^-55 cm^-2 locates the place of birth of the Sun at 19.6 kpc from GC, the same values for H_0 and Λ, and Θ_0^max=270 km s^-1, places it at the plausible Galactocentric distance of 8.5 kpc. Λ= 10^-54 cm^-2 and Λ= 10^-53 cm^-2 place the Sun at 10.6 kpc and 18.7 kpc, respectively.
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