English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the perception of the radiation phenomena of Hawking radiation andUnruh effect by using two main tools: the Unruh-DeWitt detectors and theeffective temperature function (ETF), this last tool based on Bogoliubovtransformations. Using the Unruh-DeWitt detectors we find an adiabaticexpansion of the detection properties along linear trajectories with slowlyvarying acceleration in Minkowski, which allows us to calculate the spectrumdetected, finding the thermal spectrum as the zeroth order contribution. Usingthe ETF we study the perception of Hawking radiation by observers followingradial trajectories outside a Schwarzschild black hole. One of the mostimportant results is that, in general, free-falling observers crossing theevent horizon do detect some radiation, even when the field is in the Unruhvacuum state, due to a Doppler blue-shift that diverges at the horizon. We givea general expression for the ETF, which has a clear interpretation in terms ofwell-known physical phenomena. We discuss which contribution to the perceptioncomes from the radiation emitted by the black hole, and which contribution isdue to the Unruh effect caused by the movement of the observer. We concludethat the Unruh effect is not only due to the observer's proper acceleration andcannot even be defined locally, but is due to the observer's acceleration withrespect to the asymptotic region. We apply the ETF to the analysis of differentphysical situations, in particular to a possible buoyancy scenario near thehorizon due to Hawking radiation pressure. Finally, we propose a non-stationaryvacuum state, which we call pulsating vacuum, for the radiation field outside astellar object hovering closely to form an event horizon. In this vacuum state,we get nearly Hawking radiation emitted by the object, while avoiding the knownproblems of the information paradox and the trans-planckian problem.

Hawking and Unruh radiation perception by different observers: applications of the effective temperature function (in Spanish)