Outputs (39)

Probing hidden topology with quantum detectors (2025)
Journal Article
Bhattacharya, D., Louko, J., & Mann, R. B. (2025). Probing hidden topology with quantum detectors. Physical Review D, 111(4), Article 045005. https://doi.org/10.1103/physrevd.111.045005

We consider the transition rate of a static Unruh-DeWitt detector in two (2+1)-dimensional black hole spacetimes that are isometric to the static Bañados-Teitelboim-Zanelli black hole outside the horizon but have no asymptotically locally anti-de Sit... Read More about Probing hidden topology with quantum detectors.

Connecting the circular and drifted Rindler Unruh effects (2025)
Journal Article
Parry, L. J., & Louko, J. (2025). Connecting the circular and drifted Rindler Unruh effects. Physical Review D, 111(2), Article 025012. https://doi.org/10.1103/physrevd.111.025012

In Minkowski spacetime quantum field theory, each stationary motion is associated with an effective, energy-dependent notion of temperature, which generalizes the familiar Unruh temperature of uniform linear acceleration. Motivated by current experim... Read More about Connecting the circular and drifted Rindler Unruh effects.

Local quantum detection of the cosmological expansion: Unruh-DeWitt detectors in spatially compact Milne cosmology (2025)
Journal Article
Wilkinson, A. S., & Louko, J. (2025). Local quantum detection of the cosmological expansion: Unruh-DeWitt detectors in spatially compact Milne cosmology. Physical Review D, 111(2), Article 025008. https://doi.org/10.1103/physrevd.111.025008

We analyze the excitations and deexcitations of an inertial Unruh-DeWitt detector in the (1+1)-dimensional expanding Milne cosmology with compact spatial sections, coupled to a real massless scalar field with either untwisted or twisted boundary cond... Read More about Local quantum detection of the cosmological expansion: Unruh-DeWitt detectors in spatially compact Milne cosmology.

Making two particle detectors in flat spacetime communicate quantumly (2024)
Journal Article
Lapponi, A., Louko, J., & Mancini, S. (2024). Making two particle detectors in flat spacetime communicate quantumly. Physical Review D, 110(2), Article 025018. https://doi.org/10.1103/physrevd.110.025018

A communication protocol with nonzero quantum capacity is found when the two communicating parts are particle detector models in (3+1)-dimensional spacetime. In particular, as detectors, we consider two harmonic oscillators interacting with a scalar... Read More about Making two particle detectors in flat spacetime communicate quantumly.

More excitement across the horizon (2024)
Journal Article
Preciado-Rivas, M. R., Naeem, M., Mann, R. B., & Louko, J. (2024). More excitement across the horizon. Physical Review D, 110(2), Article 025002. https://doi.org/10.1103/physrevd.110.025002

An Unruh-DeWitt detector falling radially into a four-dimensional Schwarzschild black hole, coupled linearly to a massless scalar field that has been prepared in the Hartle-Hawking or Unruh state, has recently been shown to exhibit a local extremum i... Read More about More excitement across the horizon.

Ambient temperature versus ambient acceleration in the circular motion Unruh effect (2024)
Journal Article
Bunney, C. R., Parry, L., Perche, T. R., & Louko, J. (2024). Ambient temperature versus ambient acceleration in the circular motion Unruh effect. Physical Review D, 109(6), Article 065001. https://doi.org/10.1103/physrevd.109.065001

It is well known that the experience of a linearly accelerated observer with acceleration a, interacting with a massless scalar field in its vacuum state in 3+1 Minkowski spacetime, is identical to that of a static observer interacting with a massles... Read More about Ambient temperature versus ambient acceleration in the circular motion Unruh effect.

Vacua in locally de Sitter cosmologies, and how to distinguish them (2024)
Journal Article
Toussaint, V., & Louko, J. (2024). Vacua in locally de Sitter cosmologies, and how to distinguish them. Physical Review D, 109(2), Article 025007. https://doi.org/10.1103/physrevd.109.025007

(1 + 1)-dimensional locally de Sitter–Friedmann-Robertson-Walker cosmologies with compact spatial sections allow cosh, sinh, and exponential evolution laws, each with a freely specifiable spatial circumference parameter, and the value of this paramet... Read More about Vacua in locally de Sitter cosmologies, and how to distinguish them.

Circular motion analogue Unruh effect in a 2 + 1 thermal bath: robbing from the rich and giving to the poor (2023)
Journal Article
D Bunney, C. R., & Louko, J. (2023). Circular motion analogue Unruh effect in a 2 + 1 thermal bath: robbing from the rich and giving to the poor. Classical and Quantum Gravity, 40(15), Article 155001. https://doi.org/10.1088/1361-6382/acde3b

The Unruh effect states that a uniformly linearly accelerated observer with proper acceleration a experiences the Minkowski vacuum as a thermal state at temperature 𝘛ᵤ = 𝑎/(2π). An observer in uniform circular motion experiences a similar effective t... Read More about Circular motion analogue Unruh effect in a 2 + 1 thermal bath: robbing from the rich and giving to the poor.

A little excitement across the horizon (2022)
Journal Article
Ng, K. K., Zhang, C., Louko, J., & Mann, R. B. (2022). A little excitement across the horizon. New Journal of Physics, 24(10), Article 103018. https://doi.org/10.1088/1367-2630/ac9547

We analyse numerically the transitions in an Unruh-DeWitt detector, coupled linearly to a massless scalar field, in radial infall in (3 + 1)-dimensional Schwarzschild spacetime. In the Hartle-Hawking and Unruh states, the transition probability attai... Read More about A little excitement across the horizon.

The cost of building a wall for a fermion (2022)
Journal Article
Wan Mokhtar, W. M. H., & Louko, J. (2022). The cost of building a wall for a fermion. Journal of High Energy Physics, 2022(8), Article 69. https://doi.org/10.1007/JHEP08%282022%29069

We analyse the energy cost of building or demolishing a wall for a massless Dirac field in (1+1)-dimensional Minkowski spacetime and the response of an Unruh-DeWitt particle detector to the generated radiation. For any smoothly-evolving wall, both th... Read More about The cost of building a wall for a fermion.