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The Unruh effect is the prediction that an accelerating object perceives its surroundings as a bath of thermal radiation even if it accelerates in vacuum. The Unruh effect is believed to be very difficult to observe in the experiment, since…

Optics · Physics 2019-04-23 I. I. Smolyaninov

One of the most fascinating aspects of quantum fields in curved spacetime is the Unruh effect. The direct experimental detection of Unruh temperature has remained an elusive challenge up to now. Gradient optical waveguides manipulating the…

Optics · Physics 2021-09-01 Hui Ge , Chong Sheng , Shining Zhu , Hui Liu

High-intensity laser fields acting on free electrons were proposed to create sufficiently large accelerations to enable detection of Unruh radiation. However, the currently achievable electron accelerations are not large enough. Here we…

Optics · Physics 2021-03-04 Igor I. Smolyaninov

The Unruh effect, thereby an ideally accelerated quantum detector is predicted to absorb thermalized virtual photons and re-emit real photons, is significantly extended for laboratory accessible configurations. Using modern influence…

General Relativity and Quantum Cosmology · Physics 2022-12-27 Charles H. -T. Wang , Gianluca Gregori , Robert Bingham , Yakubu Adamu , Bethel N. Eneh , Maé C. Rodriguez , Sarah-Jane Twigg

We calculate the radiation resulting from the Unruh effect for strongly accelerated electrons and show that the photons are created in pairs whose polarizations are maximally entangled. Apart from the photon statistics, this quantum…

Quantum Physics · Physics 2009-11-13 Ralf Schützhold , Gernot Schaller , Dietrich Habs

Detecting thermal Unruh radiation from accelerated electrons has presented a formidable challenge due not only to technical difficulties but also for lack of conceptual clarity about what is actually seen by a laboratory observer. We give a…

General Relativity and Quantum Cosmology · Physics 2024-05-09 Gianluca Gregori , Giacomo Marocco , Subir Sarkar , Robert Bingham , Charles Wang

An accelerated particle sees the Minkowski vacuum as thermally excited, which is called the Unruh effect. Due to an interaction with the thermal bath, the particle moves stochastically like the Brownian motion in a heat bath. It has been…

High Energy Physics - Phenomenology · Physics 2011-02-24 Satoshi Iso , Yasuhiro Yamamoto , Sen Zhang

The Unruh effect, predicting a thermal reservoir for accelerating systems, calls for a more refined understanding of measurement processes involving quantum systems as thermometers. Conventional models fail to account for the inherent…

Quantum Physics · Physics 2025-02-26 M. Cardi , P. Solinas , N. Zanghì

The Unruh effect is the phenomenon that accelerated observers detect particles even when inertial observers experience the vacuum state. In particular, uniformly accelerated observers are predicted to measure thermal radiation that is…

Quantum Physics · Physics 2020-08-06 Luis C. Barbado , Esteban Castro-Ruiz , Luca Apadula , Časlav Brukner

The Unruh effect predicts that a uniformly accelerating observer perceives the vacuum as a thermal bath, yet direct observation remains elusive [1]. We simulate Unruh radiation in realistic high-intensity laser-electron collisions relevant…

High Energy Physics - Experiment · Physics 2025-09-10 Rafi Hessami , Haidar Al-Naseri , Monika Yadav , Maanas Hemanth Oruganti , Brian Naranjo , James Rosenzweig

In an FEL the electrons traveling through the undulator are surrounded in their own reference frame by Unruh radiation at a temperature of order 8,000 Kelvin. When these virtual photons scatter from the beam electrons they become real and…

General Physics · Physics 2018-06-05 Adrian Melissinos

We show under what conditions an accelerated detector (e.g., an atom/ion/molecule) thermalizes while interacting with the vacuum state of a quantum field in a setup where the detector's acceleration alternates sign across multiple optical…

Quantum Physics · Physics 2021-11-09 Silas Vriend , Daniel Grimmer , Eduardo Martín-Martínez

The Unruh effect is a quantum relativistic effect where the accelerated observer perceives the vacuum as a thermal state. Here we propose the experimental realization of the Unruh effect for interacting ultracold fermions in optical…

Quantum Gases · Physics 2018-12-17 Arkadiusz Kosior , Maciej Lewenstein , Alessio Celi

The Unruh's thermal state in the vicinity of the event horizon of the black hole provides conditions where impinging particles can radiate other particles. The subsequent decays may eventually lead to observable radiation of photons and…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 J. Ridky

Varying the proposition that acceleration itself would simulate a thermal environment, we investigate the semiclassical photon radiation as a possible telemetric thermometer of accelerated charges. Based on the classical Jackson formula we…

High Energy Physics - Phenomenology · Physics 2012-12-18 T. S. Biro , M. Gyulassy , Z. Schram

We investigate the influence of Unruh radiation on matter-wave interferometry experiments using neutral objects modeled as dielectric spheres. The Unruh effect leads to a loss of coherence through momentum diffusion. This is a fundamental…

Quantum Physics · Physics 2015-12-03 Andrew Steane

We show that massive particles created in a relativistically accelerated reference frame, as predicted by the Unruh effect, can only be found in a tiny layer above the event horizon, whose thickness corresponds to a single Compton…

Quantum Physics · Physics 2018-03-21 Filip Kiałka , Alexander R. H. Smith , Mehdi Ahmadi , Andrzej Dragan

Acceleration radiation - or Unruh radiation - the thermal radiation observed by an ever accelerating observer or detector, although having similarities to Hawking radiation, so far has proved extremely challenging to observe experimentally.…

Quantum Physics · Physics 2020-03-05 Brian P. Dolan , Aonghus Hunter-McCabe , Jason Twamley

We identify the relativistic-fluid counterpart of the Unruh effect, in which a comoving probe measures a Thermodynamic Unruh temperature. Frame changes in first-order hydrodynamics are recast as a local, time-dependent hyperbolic rotation…

General Relativity and Quantum Cosmology · Physics 2025-11-27 Eren Erberk Erkul

In this work, the notion of spacetime of maximal proper acceleration is motivated as a weak form to implement general covariance and a generalized form of Einstein's equivalence principle from a physical point of view and the fundamental…

General Relativity and Quantum Cosmology · Physics 2025-08-29 Ricardo Gallego Torromé
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