Kinematic study of the effect of dispersion in quantum vacuum emission from strong laser pulses
Authors: Finazzi S., Carusotto I.
Autors Affiliation: INO-CNR BEC Center, I-38123 Povo, Italy; Dipartimento di Fisica, Universit`a di Trento, via Sommarive 14, 38123 Povo-Trento, Italy
Abstract: A strong light pulse propagating in a nonlinear medium causes an effective change in the local refractive index. With a suitable tuning of the pulse velocity, the leading and trailing edge of the pulse were predicted to behave as analogue black and white horizons in the limit of a dispersionless medium. In this paper, we study a more realistic situation where the frequency dispersion of the medium is fully taken into account. As soon as positive-frequency modes with negative norm are present in the comoving frame, spontaneous emission of quantum vacuum radiation is expected to arise independently of the presence of horizons. We finally investigate the kinematic constraints put on the emission and we show that the optimal directions to observe Hawking-like emission form a narrow angle with the direction of propagation of the pulse.
Journal/Review: EUROPEAN PHYSICAL JOURNAL PLUS
Volume: 127 (7) Pages from: 78 to: 78
KeyWords: nonlinear optics; hawking radiation; pulseDOI: 10.1140/epjp/i2012-12078-xCitations: 12data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-10-13References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here