Weaver says it may have been an initial collision with an asteroid , or perhaps the comet ' s rapid rotation caused it to unravel 維沃說這或許是跟小行星相撞引起的,抑或是慧星的高速旋轉導致的分裂。
The knowledge of these initial collision is crucial for any theoretical treat - ment of a possible parton - hadron phase transition , the detection of which being the ultimate aim of all the efforts of co1liding heavy ions at very high energies . the parton model allows to calculate inclusive cross sections as a convolution of any elementary cross section with parton distribution functions , assuming that factorization works . the disadvantage is that tlle first interaction is coilsidered quite differently from the subsequent ones in case of multiple scattering 其它的弦模型在計算幾率時,忽略了入射能量在pomeron之間的分配,破壞了能量守恒,而且把pomeron作為全同粒子處理,即pomeron之間是不可區(qū)分的;然而在處理粒子產(chǎn)生時,這些模型雖然考慮了能量守恒,但是第一個pomeron的粒子產(chǎn)生與其它的pomeron很不一樣? ? pomeron在粒子產(chǎn)生時不是全同的。