000148689 001__ 148689
000148689 005__ 20250121150753.0
000148689 0247_ $$2doi$$a10.1088/1361-6382/ab3780
000148689 0248_ $$2sideral$$a112943
000148689 037__ $$aART-2019-112943
000148689 041__ $$aeng
000148689 100__ $$0(orcid)0000-0003-0694-155X$$aAlonso, J.L.$$uUniversidad de Zaragoza
000148689 245__ $$aBefore spacetime: a proposal of a framework for multiverse quantum cosmology based on three cosmological conjectures
000148689 260__ $$c2019
000148689 5060_ $$aAccess copy available to the general public$$fUnrestricted
000148689 5203_ $$aThe three cosmological conjectures to which our work refers are: the phenomenon called geodesic incompleteness, the physical gravitational theta(G)-term that would characterize the one-parameter family of inequivalent vacua of quantum gravidynamics, and the hypothesis of multiversality (Wilczek 2013 Class. Quantum Grav. 30 193001), more specifically, a zero-energy multiverse. The known cosmological phenomenology leads under plausible assumptions to theorems which establish that the universe is past incomplete (Borde A et al 2003 Phys. Rev. Lett. 90 151301; Vilenkin and Zhang 2014 J. Cosmol. Astropart. Phys. JCAP06(2014) 034). Here, starting from Wilczek''s definition of multiverse (Wilczek 2013 Class. Quantum Grav. 30 193001) (a larger physical structure of which the universe forms part) and that spacetime is much larger than the observable universe, in a new sense suggested by these theorems, we place the observable universe, labelled by U-theta G(1), within a multiverse ensemble, {U-theta G}. Its topological theta((1))(G)-term would characterize the observable universe from the Planck epoch until the present time, and it could have physical effects in, for example, black-hole physics. Our proposal is therefore a possible framework for a multiverse quantum cosmology, in which the temporal parameters (see figures in the main text) start from a ''timeless multiverse big bang'' (TLMBB), where all members of the multiverse ensemble, {U-theta G}, disappear, together with their corresponding classical spacetimes. Since quantum cosmology can be viewed as one attempt among many to face with the question of finding a gravitational quantum theory, if the TLMBB were the appropriate ground to define the physical or mathematical underlying structure of quantum cosmology, then multiversality could come to have a predictive power within our observable universe.
000148689 536__ $$9info:eu-repo/grantAgreement/EUR/COST-Action/CA18108$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2015-65745-P$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/PGC2018-095328-B-I00
000148689 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000148689 590__ $$a3.071$$b2019
000148689 591__ $$aASTRONOMY & ASTROPHYSICS$$b26 / 68 = 0.382$$c2019$$dQ2$$eT2
000148689 591__ $$aQUANTUM SCIENCE & TECHNOLOGY$$b6 / 17 = 0.353$$c2019$$dQ2$$eT2
000148689 591__ $$aPHYSICS, PARTICLES & FIELDS$$b9 / 29 = 0.31$$c2019$$dQ2$$eT1
000148689 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b23 / 84 = 0.274$$c2019$$dQ2$$eT1
000148689 592__ $$a1.365$$b2019
000148689 593__ $$aPhysics and Astronomy (miscellaneous)$$c2019$$dQ1
000148689 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000148689 700__ $$0(orcid)0000-0003-2264-2306$$aCarmona, J.M.$$uUniversidad de Zaragoza
000148689 7102_ $$12004$$2405$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Teórica
000148689 7102_ $$12004$$2390$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Atóm.Molec.y Nucl.
000148689 773__ $$g36, 18 (2019), 185001 [12 pp.]$$pClass. quantum gravity$$tClassical and Quantum Gravity$$x0264-9381
000148689 8564_ $$s400619$$uhttps://zaguan.unizar.es/record/148689/files/texto_completo.pdf$$yPostprint
000148689 8564_ $$s3109709$$uhttps://zaguan.unizar.es/record/148689/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
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000148689 951__ $$a2025-01-21-14:43:29
000148689 980__ $$aARTICLE