Basic Principles of 4D Dilatonic Gravity and Some of Their Consequences for Cosmology, Astrophysics and Cosmological Constant Problem
| dc.creator | Fiziev, Plamen P. | |
| dc.date | 2002-02-21 | |
| dc.date | 2002-07-02 | |
| dc.date.accessioned | 2026-07-07T03:26:41Z | |
| dc.date.available | 2026-07-07T03:26:41Z | |
| dc.description | We present a class of simple scalar-tensor models of gravity with one scalar field (dilaton $Φ$) and only one unknown function (cosmological potential $U(Φ)$). These models might be considered as a stringy inspired ones with broken SUSY. They have the following basic properties: 1) Positive dilaton mass, $m_Φ$, and positive cosmological constant $Λ$, define two extremely different scales. The models under consideration are consistent with the known experimental facts if $m_Φ> 10^{-3} eV$ and $Λ=Λ^{obs}\sim 10^{-56} cm^{-2}$. 2) Einstein week equivalence principle is strictly satisfied and extended to scalar-tensor theories of gravity using a novel form of principle of "constancy of fundamental constants". 3) The dilaton plays simultaneously role of inflation field and quintessence field and yields a sequential hyper-inflation with graceful exit to asymptotic de Sitter space-time which is an attractor, and is approached as $\exp(-\sqrt{3Λ^{obs}} ct/2)$. The time duration of inflation is $Δt_{infl} \sim m_Φ^{-1}$. 4) Ultra-high frequency ($ω_Φ\sim m_Φ$) dilatonic oscillations take place in asymptotic regime. 5) No fine tuning. (The Robertson-Walker solutions of general type have the above properties.) 6) A novel adjustment mechanism for cosmological constant problem seems to be possible: the huge value of cosmological constant in the stringy frame is re-scaled to its observed value by dilaton after transition to phenomenological frame. | |
| dc.description | 34 pages, 5 figures, LaTeX file, added references, corrected typos | |
| dc.identifier | https://arxiv.org/abs/gr-qc/0202074 | |
| dc.identifier | http://arxiv.org/abs/gr-qc/0202074 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/34140 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Basic Principles of 4D Dilatonic Gravity and Some of Their Consequences for Cosmology, Astrophysics and Cosmological Constant Problem | |
| dc.type | text |