A relativistic toy model for back-reaction

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dc.creatorPlunien, Günter
dc.creatorRuser, Marcus
dc.creatorSchützhold, Ralf
dc.date2004-08-10
dc.date.accessioned2026-07-07T10:48:15Z
dc.date.available2026-07-07T10:48:15Z
dc.descriptionWe consider a quantized massless and minimally coupled scalar field on a circular closed string with a time-dependent radius $R(t)$, whose undisturbed dynamics is governed by the Nambu-Goto action. Within the semi-classical treatment, the back-reaction of the quantum field onto the string dynamics is taken into account in terms of the renormalized expectation value of the energy-momentum tensor including the trace anomaly. The results indicate that the back-reaction could prevent the collapse of the circle $R\downarrow0$ -- however, the semi-classical picture fails to describe the string dynamics at the turning point (i.e., possible bounce) at finite values of $R$ and $\dot R$. The fate of the closed string after that point (e.g., oscillation or eternal acceleration) cannot be determined within the semi-classical picture and thus probably requires the full quantum treatment. PACS: 04.62.+v, 03.70.+k, 11.15.Kc, 04.60.-m.
dc.description8 pages RevTeX, 4 figures
dc.identifierhttps://arxiv.org/abs/gr-qc/0408028
dc.identifierhttp://arxiv.org/abs/gr-qc/0408028
dc.identifierClass.Quant.Grav.24:4361-4376,2007
dc.identifierdoi:10.1088/0264-9381/24/17/006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183814
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectQuantum Physics
dc.titleA relativistic toy model for back-reaction
dc.typetext

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