Editing Sonoluminescence (section)

====Quantum explanations====
An unusually exotic hypothesis of sonoluminescence, which has received much popular attention, is the Casimir energy hypothesis suggested by noted physicist [[Julian Schwinger]]<ref>{{cite web | first = Julian | last = Schwinger | name-list-style = vanc |url=http://www.infinite-energy.com/iemagazine/issue1/colfusthe.html |title= Cold Fusion: A History of Mine |publisher=Infinite-energy.com |date=1989-03-23 |access-date=2012-11-14}}</ref> and more thoroughly considered in a paper by [[Claudia Eberlein]]<ref>{{cite journal | vauthors = Eberlein C | title = Theory of quantum radiation observed as sonoluminescence. | journal = Physical Review A | date = April 1996 | volume = 53 | issue = 4 | pages = 2772–2787 | doi = 10.1103/PhysRevA.53.2772| pmid = 9913192 | url = https://pdfs.semanticscholar.org/27f5/25c6fca3f8eff0605a6f71c75ce2a677ce7e.pdf | archive-url = https://web.archive.org/web/20190323091226/https://pdfs.semanticscholar.org/27f5/25c6fca3f8eff0605a6f71c75ce2a677ce7e.pdf | url-status = dead | archive-date = 2019-03-23 | bibcode = 1996PhRvA..53.2772E | arxiv = quant-ph/9506024 | s2cid = 10902274 }}</ref> of the [[University of Sussex]]. Eberlein's paper suggests that the light in sonoluminescence is generated by the vacuum within the bubble in a process similar to [[Hawking radiation]], the radiation generated at the [[event horizon]] of [[black hole]]s. According to this vacuum energy explanation, since quantum theory holds that vacuum contains [[virtual particle]]s, the rapidly moving interface between water and gas converts virtual photons into real photons. This is related to the [[Unruh effect]] or the [[Casimir effect]]. The argument has been made that sonoluminescence releases too large an amount of energy and releases the energy on too short a time scale to be consistent with the vacuum energy explanation,<ref>{{cite arXiv | vauthors = Milton KA | title = Dimensional and Dynamical Aspects of the Casimir Effect: Understanding the Reality and Significance of Vacuum Energy | date = September 2000 | eprint = hep-th/0009173 }}</ref> although other credible sources argue the vacuum energy explanation might yet prove to be correct.<ref>{{cite arXiv | vauthors = Liberati S, Belgiorno F, Visser M | title = Comment on "Dimensional and dynamical aspects of the Casimir effect: understanding the reality and significance of vacuum energy" | eprint = hep-th/0010140v1 | year = 2000 }}</ref>