The Arrow of Time Forbids a Positive Cosmological Constant $Λ$
| dc.creator | Mersini-Houghton, Laura | |
| dc.date | 2006-09-01 | |
| dc.date | 2007-04-20 | |
| dc.date.accessioned | 2026-07-07T07:57:24Z | |
| dc.date.available | 2026-07-07T07:57:24Z | |
| dc.description | Motivated by the mounting evidence for dark energy, here we explore the consequences of a fundamental cosmological constant $Λ$ for our universe. We show that when the gravitational entropy of a pure DeSitter state ultimately wins over matter, then the thermodynamic arrow of time in our universe must reverse in scales of order a Hubble time. We find that due to the dynamics of gravity and nonlocal entanglement, a finite size system such as a DeSitter patch with horizon size $H_0^{-1}$ has a finite lifetime $Δt$. This phenomenon arises from the dynamic gravitational instabilities that develop during a DeSitter epoch and turn catastrophic. A reversed arrow of time is clearly in disagreement with observations. Thus we are led to conclude: Nature forbids a fundamental $Λ$. Or else general relativity must be modified in the IR regime when $Λ$ dominates the expansion of the Universe. | |
| dc.description | 6 pages, added 1 appendix that summarizes previous results, typos fixed | |
| dc.identifier | https://arxiv.org/abs/gr-qc/0609006 | |
| dc.identifier | http://arxiv.org/abs/gr-qc/0609006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/127637 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | The Arrow of Time Forbids a Positive Cosmological Constant $Λ$ | |
| dc.type | text |