On the Trace-Free Einstein Equations as a Viable Alternative to General Relativity - General Relativity and Quantum CosmologyReportar como inadecuado




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Abstract: The quantum field theoretic prediction for the vacuum energy density leads toa value for the effective cosmological constant that is incorrect by between 60to 120 orders of magnitude. We review an old proposal of replacing Einstein-sField Equations by their trace-free part the Trace-Free Einstein Equations,together with an independent assumption of energy-momentum conservation bymatter fields. While this does not solve the fundamental issue of why thecosmological constant has the value that is observed cosmologically, it isindeed a viable theory that resolves the problem of the discrepancy between thevacuum energy density and the observed value of the cosmological constant.However, one has to check that, as well as preserving the standard cosmologicalequations, this does not destroy other predictions, such as the junctionconditions that underlie the use of standard stellar models. We confirm that noproblems arise here: hence, the Trace-Free Einstein Equations are indeed viablefor cosmological and astrophysical applications.



Autor: George F. R. Ellis, Henk van Elst, Jeff Murugan, Jean-Philippe Uzan

Fuente: https://arxiv.org/



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