Implications of a Decay Law for the Cosmological Constant in Higher Dimensional Cosmology and Cosmological Wormholes
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| Format: | Artículo científico |
| Sprache: | en |
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Sociedade Brasileira de Física
2009
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| author | El-Nabulsi Ahmad Rami |
| author_facet | El-Nabulsi Ahmad Rami |
| contents | Implications of a Decay Law for the Cosmological Constant in Higher Dimensional Cosmology and Cosmological Wormholes El-Nabulsi Ahmad Rami Física, Astronomía y Matemáticas Extra wormhole dimensions Big bounce Dark energy Higher dimensional cosmological implications ofa decay law for the cosmological constant term are analyzed. Three independent cosmological models are explored mainly: 1) - In the first model, the effective cosmological constant was chosen to decay with times like A effective = Ca-2 + D(b/a i)² where aiis an arbitrary scale factor characterizing the isotropic epoch which proceeds the graceful exit period. Further, the extra-dimensional scale factor decays classically like b(t) =; a x (t),xisareal negative number. 2) - In the second model, we adopt in addition to A effective = Ca-2 + D(b/a i)² the phenomenological law b(t) = a(t) exp(-Qt) as we expect that at the origin of time, there is no distinction between the visible and extra dimensions; Qis a real number. 3) -In the third model, we study a A-decaying extra-dimensional cosmology with a static traversable wormhole in which the four-dimensional Friedmann-Robertson-Walker spacetime is subject to the conventional perfect fluid while the extra-dimensional part is endowed by an exotic fluid violating strong energy condition and where the cosmological constant in (3+n+1) is assumed to decays like A (a) = 3Ca-2. The three models are discussed and explored in some details where many interesting points are revealed. 2009 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413562012 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.39 |
| format | Artículo científico |
| id | redalyc_46413562012 |
| institution | Redalyc |
| language | en |
| publishDate | 2009 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Implications of a Decay Law for the Cosmological Constant in Higher Dimensional Cosmology and Cosmological Wormholes El-Nabulsi Ahmad Rami Física, Astronomía y Matemáticas Extra wormhole dimensions Big bounce Dark energy Implications of a Decay Law for the Cosmological Constant in Higher Dimensional Cosmology and Cosmological Wormholes El-Nabulsi Ahmad Rami Física, Astronomía y Matemáticas Extra wormhole dimensions Big bounce Dark energy Higher dimensional cosmological implications ofa decay law for the cosmological constant term are analyzed. Three independent cosmological models are explored mainly: 1) - In the first model, the effective cosmological constant was chosen to decay with times like A effective = Ca-2 + D(b/a i)² where aiis an arbitrary scale factor characterizing the isotropic epoch which proceeds the graceful exit period. Further, the extra-dimensional scale factor decays classically like b(t) =; a x (t),xisareal negative number. 2) - In the second model, we adopt in addition to A effective = Ca-2 + D(b/a i)² the phenomenological law b(t) = a(t) exp(-Qt) as we expect that at the origin of time, there is no distinction between the visible and extra dimensions; Qis a real number. 3) -In the third model, we study a A-decaying extra-dimensional cosmology with a static traversable wormhole in which the four-dimensional Friedmann-Robertson-Walker spacetime is subject to the conventional perfect fluid while the extra-dimensional part is endowed by an exotic fluid violating strong energy condition and where the cosmological constant in (3+n+1) is assumed to decays like A (a) = 3Ca-2. The three models are discussed and explored in some details where many interesting points are revealed. 2009 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413562012 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.39 |
| title | Implications of a Decay Law for the Cosmological Constant in Higher Dimensional Cosmology and Cosmological Wormholes |
| topic | Física, Astronomía y Matemáticas Extra wormhole dimensions Big bounce Dark energy |
| url | https://www.redalyc.org/articulo.oa?id=46413562012 |