Unruh effect without trans-horizon entanglement

Rovelli, Carlo; Smerlak, Matteo

doi:10.1103/physrevd.85.124055

Cited by 13 publications

(17 citation statements)

References 20 publications

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“…the response of a co-accelerated particle detector and the distribution of the Rindler particles in the initial vacuum still display a thermal form. Our result thus adds further evidence in favour of the views which emphasize the local nature of the effect, along with its independence from the Rindler horizon [6,10,13,14].…”

Section: Discussionsupporting

confidence: 77%

“…4 As stated in [10], this shows that "the thermal character of the transition rates of the uniformly accelerated detector cannot be reduced to the effect of tracing out the modes behind the horizon," which essentially coincides with the view in [12,13,14] The aim of this paper is to add another item on the list in favour of the independence of the Unruh effect from the Rindler horizon. The idea in our construction is to mask as in [10] the Rindler horizon with a perfect mirror, but choosing this time the mirror to follow an accelerated trajectory. 5 As we will see, a nice feature of this configuration is that it allows to analyse both the local 3 For clarity, the effective temperature obtained in [17,18] does not reproduce the Unruh temperature (1).…”

Section: Introductionsupporting

confidence: 57%

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Unruh effect without Rindler horizon

Nicolaevici¹

2015

Class. Quantum Grav.

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We investigate the Unruh effect for a massless scalar field in the two dimensional Minkowski space in the presence of a uniformly accelerated perfect mirror, with the trajectory of the mirror chosen in such a way that the mirror completely masks the Rindler horizon from the spacetime region of interest. We find that the characteristic thermodynamical properties of the effect remain unchanged, i.e. the response of a uniformly co-accelerated Unruh detector and the distribution of the Rindler particles retain their thermal form. However, since in this setup there are no unobserved degrees of freedom of the field, the thermal statistics of the Rindler particles is inconsistent with an initial pure vacuum, which leads us to reconsider the problem for the more physical case when the mirror is inertial in the past. In these conditions we find that the distribution of the Rindler particles is non-thermal even in the limit of infinite acceleration times, but an effective thermal statistics can be recovered provided that one restricts to the expectation values of smeared operators associated to finite norm Rindler states. We explain how the thermal statistics in our problem can be understood in analogy with that in the conventional version of the effect.

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Section: Discussionsupporting

confidence: 77%

Section: Introductionsupporting

confidence: 57%

Unruh effect without Rindler horizon

Nicolaevici¹

2015

Class. Quantum Grav.

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“…For detectors on the hyperbolic trajectories shown in the right panel of figure 1, the Gaussian window functions cause the detectors to spend a very long time traveling near the speed of light and interacting with the 8 Recent results, however, bring the naturalness of this picture into question [41]. 9 In the case of constant and always-on coupling, A would diverge, which is why it is common to talk about transition rates in that case, rather than the total probability of excitation [32].…”

Section: Causal Residue Contributionmentioning

confidence: 99%

Acceleration-assisted entanglement harvesting and rangefinding

2015

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We study entanglement harvested from a quantum field through local interaction with Unruh-DeWitt detectors undergoing linear acceleration. The interactions allow entanglement to be swapped locally from the field to the detectors. We find an enhancement in the entanglement harvesting by two detectors with anti-parallel acceleration over those with inertial motion. This enhancement is characterized by the presence of entanglement between two detectors that would otherwise maintain a separable state in the absence of relativistic motion (with the same distance of closest approach in both cases). We also find that entanglement harvesting is degraded for two detectors undergoing parallel acceleration in the same way as for two static, comoving detectors in a de Sitter universe. This degradation is known to be different from that of two inertial detectors in a thermal bath. We comment on the physical origin of the harvested entanglement and present three methods for determining distance between two detectors using properties of the harvested entanglement. Information about the separation is stored nonlocally in the joint state of the accelerated detectors after the interaction; a single detector alone contains none. We also find an example of entanglement sudden death exhibited in parameter space.

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“…(See e.g. [13][14][15][16][17][18][19] and references therein for a small but interesting selection of different topics.) A holographic formula for this quantity was proposed in [20,21] as the minimal surface in the bulk for a given boundary.…”

Section: Introductionmentioning

confidence: 99%

Holographic entanglement entropy in the QCD phase diagram with a critical point

Knaute

Kämpfer

2017

Phys. Rev. D

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We calculate the holographic entanglement entropy for the holographic QCD phase diagram considered in [1] and explore the resulting qualitative behavior over the temperature-chemical potential plane. In agreement with the thermodynamic result, the phase diagram exhibits the same critical point as the onset of a first-order phase transition curve. We compare the phase diagram of the entanglement entropy to that of the thermodynamic entropy density and find a striking agreement in the vicinity of the critical point. Thus, the holographic entanglement entropy qualifies to characterize different phase structures. The scaling behavior near the critical point is analyzed through the calculation of critical exponents.

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Unruh effect without trans-horizon entanglement

Cited by 13 publications

References 20 publications

Unruh effect without Rindler horizon

Unruh effect without Rindler horizon

Acceleration-assisted entanglement harvesting and rangefinding

Holographic entanglement entropy in the QCD phase diagram with a critical point

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