Editing Cosmological principle (section)

== Perfect cosmological principle ==
The '''perfect cosmological principle''' is an extension of the cosmological principle, and states that the universe is homogeneous and isotropic in space ''and'' time. In this view the universe looks not only the same everywhere in space (on large scales), but also the same as it always has and always will. The perfect cosmological principle underpins [[steady state theory]] and emerges{{clarify|underpins emerging? does this mean underpins the emergence of something (unstated) from chaotic inflation theory?|date=April 2017}} from [[chaotic inflation theory]].<ref>{{cite journal |author=Aguirre |first1=Anthony |last2=Gratton |first2=Steven |name-list-style=amp |date=2003 |title=Inflation without a beginning: A null boundary proposal |journal=Physical Review D |volume=67 |issue=8 |page=083515 |arxiv=gr-qc/0301042 |bibcode=2003PhRvD..67h3515A |doi=10.1103/PhysRevD.67.083515 |s2cid=37260723}}</ref><ref>{{cite journal |author=Aguirre |first1=Anthony |last2=Gratton |first2=Steven |name-list-style=amp |date=2002 |title=Steady-State Eternal Inflation |journal=Physical Review D |volume=65 |issue=8 |page=083507 |arxiv=astro-ph/0111191 |bibcode=2002PhRvD..65h3507A |doi=10.1103/PhysRevD.65.083507 |s2cid=118974302}}</ref><ref>{{cite web|url=http://www.lifesci.sussex.ac.uk/home/John_Gribbin/cosmo.htm|title=Inflation for Beginners|author=Gribbin, John|author-link=John Gribbin|access-date=2017-02-01|archive-date=2010-03-26|archive-url=https://web.archive.org/web/20100326145452/http://www.lifesci.sussex.ac.uk/home/John_Gribbin/cosmo.htm|url-status=dead}}</ref>