标题： 如何确定一个可变宇宙项的有效势 显示英文标题

标题： How to determine an effective potential for a variable cosmological term

摘要： 结果表明，如果目前宇宙中的可变宇宙项由与引力具有最小耦合且具有某些现象学自相互作用势 $V(\varphi)$ 的标量场描述，那么这个势可以毫无歧义地从以下观测数据中确定：要么是从尘状物质组分的密度扰动随红移的变化行为（在额外给出哈勃常数的情况下），要么是从光度距离随红移的变化（在以临界密度给出目前尘状物质密度的情况下）。 显示英文摘要

摘要： It is shown that if a variable cosmological term in the present Universe is described by a scalar field with minimal coupling to gravity and with some phenomenological self-interaction potential $V(\varphi)$, then this potential can be unambiguously determined from the following observational data: either from the behaviour of density perturbations in dustlike matter component as a function of redshift (given the Hubble constant additionally), or from the luminosity distance as a function of redshift (given the present density of dustlike matter in terms of the critical one).