2007年4月24日 · A cosmological event horizon is a theoretical boundary in space beyond which light and other forms of radiation cannot reach an observer. It marks the limit of the observable …

2012年6月29日 · I was hoping somebody could point me towards a derivation of the following formula for cosmological redshift: z = R(t0)/R(te)-1. Wikipedia just presents the formula as a …

2018年10月3日 · In summary, cosmological redshift is caused by the metric expansion of space, which stretches photons in flight and results in a shift towards the red end of the spectrum. It …

2022年10月28日 · The so-called dark energy associated with the cosmological constant also has a rather unusual equation of state (EoS) -- very different from all known matter and radiation …

2006年10月30日 · The cosmological constant is a constant added to the Einstein-Hilbert action, so the question remains whether black hole solutions are possible with such a modification of …

2013年9月3日 · The cosmological constant is thought to be the physical manifestation of dark energy, which is a mysterious force that is causing the expansion of the universe to …

2018年1月2日 · Cosmological redshift is an important tool for understanding the expansion of the universe and the distance of objects in space. By measuring the amount of redshift, scientists …

2019年1月23日 · I came across a theory called "timescape" cosmology. If I understand the theory correctly it assumes that the universe is not homogenenous due to the large voids and …

2015年6月1日 · The cosmological constant, denoted by the Greek letter lambda (Λ), is a term in Einstein's field equations of general relativity that represents the energy density of empty …

2023年7月30日 · In Appendix 4 of the book "Relativity, The Special and General Theory", Einstein describes the evolution of the cosmological implications of general relativity as follows: My …