cosmic coincidence problem
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Author(s):  
Nadeem J. Z. Hussain

The combination of non-naturalism and standard morality generates an ontic cosmic coincidence problem different from the epistemic and semantic coincidence problems already facing non-naturalism. In the normative realm, morality has a very special status. In turn morality gives a central role to persons both as agents and patients. Only some humans are persons; even very intelligent creatures such as chimpanzees and dolphins are not regarded as persons. The existence of humans, however, is highly contingent. The coincidence is that precisely the kind of very distinctive creatures needed for moral principles to apply just happen to exist. It is a coincidence because for non-naturalists moral principles do not explain events in the natural world and natural facts do not explain moral principles: the non-natural moral facts cannot explain why there are humans, and the existence of humans, or facts about their nature, cannot explain why the moral principles focus on persons.


2020 ◽  
Vol 35 (15) ◽  
pp. 2050123
Author(s):  
She-Sheng Xue

We present a possible understanding to the issues of cosmological constant, inflation, dark matter and coincidence problems based only on the Einstein equation and Hawking particle production. The inflation appears and results agree to observations. The CMB large-scale anomaly can be explained and the dark-matter acoustic wave is speculated. The entropy and reheating are discussed. The cosmological term [Formula: see text] tracks down the matter [Formula: see text] until the radiation-matter equilibrium, then slowly varies, thus the cosmic coincidence problem can be avoided. The relation between [Formula: see text] and [Formula: see text] is shown and can be examined at large redshifts.


Author(s):  
Biswaranjan Dikshit

Although general relativity has been successful in explaining many astronomical phenomena, few problems about the contents and evolution of the universe have remained mysterious since last century. Most important of them is the cosmological constant problem in which conventional calculation of vacuum (or dark) energy density using quantum mechanics leads to a value ~10114 J/m3 which is ~10123 times more than the vacuum energy (5.3×10-10 J/m3) estimated from astronomical observations of expanding universe. Similarly, cosmic coincidence problem questions why the matter energy density (ordinary plus dark matter) is of the same order as the vacuum energy density at present time. Finally, the mechanism responsible for spatial flatness and expansion of the universe are not clearly understood. In this paper, by taking the vacuum as a finite and closed quantum oscillator, we solve all of the above-mentioned problems. At first, by using purely quantum mechanical approach, we predict that the dark energy density is c4/(GR2) = 5.27×10-10 J/m3 (where R is radius of 3-sphere of universe) and matter energy density is c4/(2GR2) = 2.6×10-10 J/m3 which match well with astronomical observations. We also prove that the dark energy has always been ~66.7% and matter energy has been ~33.3% of total energy and hence, the so called cosmic coincidence problem doesn’t exist. Next, we show how flatness of space could be maintained since the early stage of universe. Finally, using our model, we derive the expression for age and radius of universe which match well with the astronomical data.


2019 ◽  
Vol 28 (1) ◽  
pp. 220-227 ◽  
Author(s):  
Biswaranjan Dikshit

Abstract One of the most important problems in astronomy is the cosmological constant problem in which conventional calculation of vacuum energy density using quantum mechanics leads to a value which is ~10123 times more than the vacuum energy estimated from astronomical observations of expanding universe. The cosmic coincidence problem questions why matter energy density is of the same order of magnitude as the vacuum energy density at present time. Finally, the mechanism responsible for spatial flatness is not clearly understood. In this paper, by taking the vacuum as a finite and closed quantum oscillator, we solve all of the above-mentioned problems. At first, by using the purely quantum mechanical approach, we predict that the dark energy density is c4/(GR2) = 5.27×10−10 J/m3 (where R is radius of 3-sphere of the universe) and matter energy density is c4/(2GR2) = 2.6×10−10 J/m3 which match well with astronomical observations. We also prove that dark energy has always been ~66.7% and matter energy has been ~33.3% of the total energy and thus solve the cosmic coincidence problem. Next, we show how flatness of space could be maintained since the early stage of the universe. Finally, using our model, we derive the expression for age and radius of the universe which match well with the astronomical data.


2009 ◽  
Vol 60 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Mubasher Jamil ◽  
Farook Rahaman ◽  
Mehedi Kalam

2009 ◽  
Vol 2009 (01) ◽  
pp. 020-020 ◽  
Author(s):  
Sergio del Campo ◽  
Ramón Herrera ◽  
Diego Pavón

2008 ◽  
Vol 661 (2-3) ◽  
pp. 67-74 ◽  
Author(s):  
Jungjai Lee ◽  
Hyeong-Chan Kim ◽  
Jae-Weon Lee

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