By Ted Jacobson (auth.), Daniele Faccio, Francesco Belgiorno, Sergio Cacciatori, Vittorio Gorini, Stefano Liberati, Ugo Moschella (eds.)

*Analogue Gravity Phenomenology *is a set of contributions that hide an unlimited variety of components in physics, starting from floor wave propagation in fluids to nonlinear optics. The underlying universal point of a lot of these themes, and consequently the main target and point of view from which they're defined right here, is the try and strengthen analogue versions for gravitational platforms. the unique and major motivation of the sector is the verification and research of Hawking radiation from a horizon: the allowing function is the prospect to generate horizons within the laboratory with quite a lot of actual structures that contain a move of 1 style or one other. The years round 2010 and onwards witnessed a unexpected surge of experimental task during this increasing box of study. even if, development an services in analogue gravity calls for the researcher to be built with a slightly huge diversity of information and pursuits. the purpose of this ebook is to deliver the reader modern with the most recent advancements and supply the fundamental heritage required with a purpose to take pleasure in the targets, problems, and good fortune tales within the box of analogue gravity.

Each bankruptcy of the e-book treats a unique subject defined intimately through the foremost specialists for every particular self-discipline. the 1st chapters supply an summary of black gap spacetimes and Hawking radiation prior to relocating directly to describe the big number of analogue spacetimes which were proposed and are at present less than research. This introductory half is then via an in-depth description of what are presently the 3 such a lot promising analogue spacetime settings, specifically floor waves in flowing fluids, acoustic oscillations in Bose-Einstein condensates and electromagnetic waves in nonlinear optics. either thought and experimental endeavours are defined intimately. the ultimate chapters check with different features of analogue gravity past the learn of Hawking radiation, corresponding to Lorentz invariance violations and Brownian movement in curved spacetimes, prior to concluding with a go back to the origins of the sphere and an outline of the on hand observational facts for horizons in astrophysical black holes.

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**Additional resources for Analogue Gravity Phenomenology: Analogue Spacetimes and Horizons, from Theory to Experiment**

**Example text**

Either way, they can lead to stimulated emission of Hawking radiation, as discussed in Sect. 3. This opportunity to probe the dependence of the emitted radiation on the incoming state is useful to experiments, and it can amplify the Hawking effect, making it easier to detect. Note however that when the Hawking radiation is stimulated rather than spontaneous, it is less quantum mechanical, and if the incoming mode is significantly populated it is essentially purely classical. 2 White Hole Radiation A white hole is the time reverse of a black hole.

If the metric is independent of x αˆ then the corresponding conjugate momentum pαˆ = ∂L/∂ x˙ αˆ = gμαˆ x˙ μ is a constant of motion. Note that this momentum can also be expressed as the inner product of the 4-velocity uν = x˙ ν with the Killing field, u · χ = gμν x˙ μ χ ν = gμαˆ x˙ μ . Killing Energy and Ergoregions The conserved momentum conjugate to a particular timelike Killing field is called Killing energy. For a particle with rest mass m, the physical 4-momentum would be p = mu, so the Killing energy as defined above is actually the Killing energy per unit rest mass.

13]). Underlying this relation is the fact that the modes on the white hole background are the time reverse of the modes on the time-reversed black hole background. Note that this means that the roles of the in and out modes are swapped. In particular, the incoming vacuum relevant to the Hawking radiation consists of low wavenumber modes propagating against the flow. When such a mode with positive norm approaches the white hole horizon, it is blocked and begins blueshifting. At this stage, it has become a superposition of positive and negative co-moving frequency (and therefore positive and negative norm) parts.