标题： H_0 和 q_0 真的具有我们所认为的数值吗？ 显示英文标题

标题： Do H_0 and q_0 really have the values we believe they have?

摘要： 我们提出一个例子，其中对宇宙的Robertson-Walker模型中光传播定律的合理修改导致H_0和q_0的识别与通常沿零测地线传播定律对应的值不同。 由此例我们可以得出结论，我们通常与H_0和q_0值相关联的观测值实际上对应于2H_0和$1/2 (q_0-1)$的值。 因此，我们通常解释为对应于中等年龄宇宙加速膨胀的观测值，可能实际上对应于一个更古老的宇宙减速膨胀。 显示英文摘要

摘要： We present an example where a justified modification of the law of propagation of light in a Robertson-Walker model of the universe leads to an identification of H_0 and q_0 different from that corresponding to the usual law of propagation along null geodesics. We conclude from this example that observed values which we would associate with the values of H_0 and q_0 with the usual interpretation correspond in fact to the values of 2H_0 and $1/2 (q_0-1)$. It is therefore possible that observed values that we usually interpret as corresponding to a moderately aged universe with accelerating expansion may in fact correspond a much older universe with a decelerating expansion.