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Phys."],"published-print":{"date-parts":[[2019,10]]},"abstract":"<jats:title>A<jats:sc>bstract<\/jats:sc>\n          <\/jats:title>\n          <jats:p>We investigate continuously self-similar solutions of four-dimensional Einstein-Maxwell-dilaton theory supported by charged null fluids. We work under the assumption of spherical symmetry and the dilaton coupling parameter <jats:italic>a<\/jats:italic> is allowed to be arbitrary. First, it is proved that the only such vacuum solutions with a time-independent asymptotic value of the dilaton necessarily have vanishing electric field, and thus reduce to Roberts\u2019 solution of the Einstein-dilaton system. Allowing for additional sources, we then obtain Vaidya-like families of self-similar solutions supported by charged null fluids. By continuously matching these solutions to flat spacetime along a null hypersurface one can study gravitational collapse analytically. Capitalizing on this idea, we compute the critical exponent defining the power-law behavior of the mass contained within the apparent horizon near the threshold of black hole formation. For the heterotic dilaton coupling <jats:italic>a<\/jats:italic> = 1 the critical exponent takes the value 1<jats:italic>\/<\/jats:italic>2 typically observed in similar analytic studies, but more generally it is given by <jats:italic>\u03b3<\/jats:italic> = <jats:italic>a<\/jats:italic>\n            <jats:sup>2<\/jats:sup>(1 + <jats:italic>a<\/jats:italic>\n            <jats:sup>2<\/jats:sup>)<jats:sup>\n              <jats:italic>\u2212<\/jats:italic>1<\/jats:sup>. The analysis is complemented by an assessment of the classical energy conditions. Finally, and on a different note, we report on a novel dyonic black hole spacetime, which is a time-dependent vacuum solution of this theory. In this case, the presence of constant electric and magnetic charges naturally breaks self-similarity.<\/jats:p>","DOI":"10.1007\/jhep10(2019)151","type":"journal-article","created":{"date-parts":[[2019,10,20]],"date-time":"2019-10-20T15:31:08Z","timestamp":1571585468000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Self-similar solutions and critical behavior in Einstein-Maxwell-dilaton theory sourced by charged null fluids"],"prefix":"10.1007","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7694-7186","authenticated-orcid":false,"given":"Pedro","family":"Aniceto","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9619-7087","authenticated-orcid":false,"given":"Jorge V.","family":"Rocha","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2019,10,11]]},"reference":[{"key":"11570_CR1","doi-asserted-by":"publisher","first-page":"455","DOI":"10.1103\/PhysRev.56.455","volume":"56","author":"JR Oppenheimer","year":"1939","unstructured":"J.R. 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