引力

Now find that there is red-shifted spectra of many objects, including objects from the observer due to Doppler redshift, there are gravitational potential difference caused by the gravitational redshift, as well as large-scale structure of space-time caused by cosmological redshift and so on.

现在发现许多天体光谱中存在红移，其中有天体离开观测者引起的多普勒速度红移，也有引力势差造成的引力红移，还有时空大尺度结构引起的宇宙学红移等。

But we do not notice the gravitational pull of a book because the pull of the earth is very much greater.

我们觉察不到一本书的引力是因为地球的引力要大得多的缘故。

Since the other forces work by exchanging carrier particles, we assume that gravity does too and call the carrier the graviton.

既然其它的力都是通过交换载体粒子来作用，我们假设引力也是如此并且称其载体为引力子。

So only have two kind of basic particle, clearly, the repulton just the electron;who is the graviton?

所以，基本粒子只有斥力子与引力子两种，显然，斥力子就是电子，引力子是谁？

In the paper whether or not the graviton is the candidate of the dark matter and dark energy is discussed by calculating interactional potential energy of graviton.

本文就通过计算引力子之间的相互作用势能来探讨引力子是否可以作为宇宙暗物质暗能量的候选者。

So how does this fit with Einstein's idea of gravity being geometry? There is some suggestion that the graviton itself is a collective effect that shows up when you tweak the underlying structure of spacetime in a certain way.

至于引力子和爱因斯坦理论中的关系，有人认为引力子本身也是当你以特定方式调节宇宙的时空结构时所展现出来的一种累积效应。

In EDSM, one does not introduce new flavor changing couplings, so the enhancement of the cross section of the top-charm associated production by gravity comes from s-channel virtual graviton exchange.

在带额外维标准模型中并没有引入新的味道改变顶点，因此引力对末态top-charm关联产生截面的增强来自于s道虚引力子的交换效应。

So far it seems to be working: the infinities that plague other theories of quantum gravity have been tamed, and the theory spits out a well-behaved graviton.

这套理论目前看来还算凑效：第一、困扰其它种种量子引力理论的"无限解"症结终于得到缓解；第二、自然而然衍生出一个"驯服"的引力子。

In the September Physical Review D , he explains that in certain circumstances Ho?ava's graviton fluctuates as it interacts with normal matter, making gravity pull a bit more strongly than expected in general relativity. The effect could make galaxies appear to contain more matter than can be seen.

在9月份的《物理评论D》上，他解释说在特定环境中，赫拉瓦引力子受正常物质的作用产生波动，使得引力比广义相对论的预测值高，从而制造假象，似乎星系中除观测到的物质之外，还包含一些"暗物质"。

The modified expression of the broad emission-line profiles ire derived for the outflow kinematics model of the BLR driven by the radiation pressure. Taking into account the difference between the two lines HeI λ5876 and Hβ, it is shown the fact that the observed line width of HeIλ 5876 is broader than that of Hβ cannot be explained by the popular outflow BLR model evoked by W. G. Mathews. For comparison, line profiles of the gravitational infall model and orbital disk model are also calculated; the later is in good agreement with the observations Thereupon, conclusion is reached that the gravitational infall is an important process in the real BLR gas motion.

1推导了辐射压加速宽线云团径向外流，以及引力下落和转动等BLR运动学模型的谱线轮廓表达式，并考虑到光致电离计算表明的云团本身对Hβ和HeIλ5876谱线的辐射差异，用数值方法计算了它们的谱线轮廓，发现普遍流行的辐射加速气体外流模型不能解释HeIλ5876线宽大于Hβ线宽的观测事实，而引力下落模型则可以较好地解释观测，因此我们倾向于认为、径向内流运动很可能是BLR内的发射线云团真实运动的一个重要成分。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了