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COSMOLOGY WITH INTERACTING DARK ENERGY

MANASSE R. MBONYE

Michigan Center for Theoretical Physics, Physics Department, University of Michigan, 2477 Randall Laboratory, Ann Arbor, MI 48109, USA

Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5604, USA

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https://doi.org/10.1142/S021773230401285XCited by:8 (Source: Crossref)

Abstract

The early cosmic inflation, when taken along with the recent observations that the universe is currently dominated by a low density vacuum energy, leads to at least two potential problems which modern cosmology must address. First, there is the old cosmological constant problem, with a new twist: the coincidence problem. Secondly, cosmology still lacks a model to predict the observed current cosmic acceleration and to determine whether or not there is a future exit out of this state (as previously in the inflationary case). This constitutes (what is called here) a dynamical problem. Here a framework is proposed to address these two problems, based on treating the cosmic background vacuum (dark) energy as both dynamical and interacting. The universe behaves as a vacuum-driven cosmic engine which, in search of equilibrium, always back-reacts to vacuum-induced accelerations by increasing its inertia (internal energy) through vacuum energy dissipation. The process couples cosmic vacuum (dark) energy to matter to produce future-directed increasingly comparable amplitudes in these fields by setting up oscillations in the decaying vacuum energy density and corresponding sympathetic ones in the matter fields. By putting bounds on the relative magnitudes of these coupled oscillations the model offers a natural and conceptually simple channel to discuss the coincidence problem, while also suggesting a way to deal with the dynamical problem. A result with important observational implications is an equation of state w(t) which specifically predicts a variable, quasi-periodic, acceleration for the current universe. This result can be directly tested by future observational techniques such as SNAP.

Keywords:

PACS: 98.80-k, 95.30Sf

References

A. Riess, et al., A. J. 116, 1009 (1998); S. Perlmutter et al., Ap. J. 517, 565 (1998) . Google Scholar
G. Efstathiou, Mon. Not. R. Astron. Soc. 330, 29 (2002), DOI: 10.1046/j.1365-8711.2002.05215.x. Crossref, Web of Science, Google Scholar
R. Stompor, Ap. J. 561L, 7 (2001); L. M. Rebull et al. , astro-ph/0203384 . Google Scholar
A. Guth, Phys. Rev. D 23, 347 (1981), DOI: 10.1103/PhysRevD.23.347. Crossref, Web of Science, ADS, Google Scholar
S. Weinberg, Rev. Mod. Phys. 61, 1 (1989); S. M. Carroll , astro-ph/0004075 . Google Scholar
J. M. Overduin and F. I. Cooperstock, Phys. Rev. D58, 043506 (1998); M. R. Mbonye, Int. J. Mod. Phys. A18, 811 (2003) , astro-ph/0208244 . Google Scholar
J. A. S. Lima, Phys. Rev. D 54, 2571 (1996), DOI: 10.1103/PhysRevD.54.2571. Crossref, Web of Science, ADS, Google Scholar
M. S. Turner and M. White, Phys. Rev. D 56, 4439 (1997), DOI: 10.1103/PhysRevD.56.R4439. Crossref, Web of Science, ADS, Google Scholar
B. Rastra and P. J. E. Peebles, Phys. Rev. D 37, 3406 (1988). Crossref, Web of Science, ADS, Google Scholar
S. Coleman, Nucl. Phys. B 307, 867 (1988), DOI: 10.1016/0550-3213(88)90110-1. Crossref, Web of Science, ADS, Google Scholar
R. H. Brandenberger , hep-th/0210165 . Google Scholar
R. R. Caldwell, R. Dave and P. J. Steinhardt, Phys. Rev. Lett. 80, 1582 (1998), DOI: 10.1103/PhysRevLett.80.1582. Crossref, Web of Science, ADS, Google Scholar
J. Carriaga, M. Livio and A. Valenkin, Phys. Rev. D61, 023503 (2000); S. B. Bludman, Nucl. Phys. A663, 865 (2000) . Google Scholar
(a) T. Padmanabhan, Class. Quantum Grav. 19, 5387 (2002); (b) T. Padmanabhan , hep-th/0212290 . Google Scholar
J. D. Jackson , Classical Electrodynamics ( John Wiley and Sons , 1975 ) . Google Scholar
J. W. Rohlf , Modern Physics from a to Z0 ( Wiley , 1994 ) . Google Scholar
A. Kim, for SNAP collab., astro-ph/0210077; G. Tarle et al., for SNAP collab., astro-ph/0210041 . Google Scholar
P. J. E. Peebles, Principles of Cosmology (Princeton Univ. Press, 1993); D. Tytler et al. , astro-ph/0001318 . Google Scholar
R. Silva, J. A. S. Lima and M. O. Calvão , gr-qc/0201048 . Google Scholar
M. O. Calvao, J. A. S. Lima and I. Waga, Phys. Lett. A 162, 223 (1992), DOI: 10.1016/0375-9601(92)90437-Q. Crossref, Web of Science, ADS, Google Scholar
J. Gaheniau, E. Gunzig and I. Stengers, Found. Phys. 17, 585 (1987); S. R. de Groot and P. Mazur, Non-Equilibrium Thermodynamics (Dover, 1984) . Google Scholar