Matthew J. Blacker
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View article: Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback
Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback Open
We theoretically investigate measurement-based feedback control over the motional degrees of freedom of an oblate quasi-2D atomic Bose-Einstein condensate (BEC) subject to continuous density monitoring. We develop a linear-quadratic-Gaussi…
View article: Quantum corrections to the path integral of near extremal de Sitter black holes
Quantum corrections to the path integral of near extremal de Sitter black holes Open
A bstract We study quantum corrections to the Euclidean path integral of charged and static four-dimensional de Sitter (dS 4 ) black holes near extremality. These black holes admit three different extremal limits (Cold, Nariai and Ultracol…
View article: Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback
Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback Open
We theoretically investigate measurement-based feedback control over the motional degrees of freedom of an oblate quasi-2D atomic Bose-Einstein condensate (BEC) subject to continuous density monitoring. We develop a linear-quadratic-Gaussi…
View article: Radial canonical AdS3 gravity and $$ T\overline{T} $$
Radial canonical AdS3 gravity and $$ T\overline{T} $$ Open
A bstract We employ an ADM deparametrization strategy to discuss the radial canonical formalism of asymptotically AdS 3 gravity. It leads to the identification of a radial ‘time’ before quantization, which is the volume time, canonically c…
View article: Radial canonical AdS$_3$ gravity and $T\bar{T}$
Radial canonical AdS$_3$ gravity and $T\bar{T}$ Open
We employ an ADM deparametrization strategy to discuss the radial canonical formalism of asymptotically AdS$_3$ gravity. It leads to the identification of a radial 'time' before quantization, which is the volume time, canonically conjugate…
View article: Cosmological quantum states of de Sitter-Schwarzschild are static patch partition functions
Cosmological quantum states of de Sitter-Schwarzschild are static patch partition functions Open
A bstract We solve the Wheeler-DeWitt equation in the ‘cosmological interior’ (the past causal diamond of future infinity) of four dimensional dS-Schwarzschild spacetimes. Within minisuperspace there is a basis of solutions labelled by a c…
View article: Wheeler DeWitt states of a charged AdS4 black hole
Wheeler DeWitt states of a charged AdS4 black hole Open
A bstract We solve the Wheeler DeWitt equation for the planar Reissner-Nordström-AdS black hole in a minisuperspace approximation. We construct semiclassical Wheeler DeWitt states from Gaussian wavepackets that are peaked on classical blac…
View article: Wheeler DeWitt States of a Charged AdS$_4$ Black Hole
Wheeler DeWitt States of a Charged AdS$_4$ Black Hole Open
We solve the Wheeler DeWitt equation for the planar Reissner-Nordström-AdS black hole in a minisuperspace approximation. We construct semiclassical Wheeler DeWitt states from Gaussian wavepackets that are peaked on classical black hole int…
View article: Cosmological quantum states of de Sitter-Schwarzschild are static patch partition functions
Cosmological quantum states of de Sitter-Schwarzschild are static patch partition functions Open
We solve the Wheeler-DeWitt equation in the 'cosmological interior' (the past causal diamond of future infinity) of four dimensional dS-Schwarzschild spacetimes. Within minisuperspace there is a basis of solutions labelled by a constant $c…
View article: Bootstrapping the Kronig-Penney Model
Bootstrapping the Kronig-Penney Model Open
Recently, bootstrap methods from conformal field theory have been adapted for studying the energy spectrum of various quantum mechanical systems. In this paper, we consider the application of these methods in obtaining the spectrum from th…
View article: Alternative approach to the quantization of the damped harmonic oscillator
Alternative approach to the quantization of the damped harmonic oscillator Open
In this paper, an alternative approach for constructing Lagrangians for driven and undriven linearly damped systems is proposed, by introducing a redefined time coordinate and an associated coordinate transformation to ensure that the resu…
View article: A new approach to the quantization of the damped harmonic oscillator
A new approach to the quantization of the damped harmonic oscillator Open
In this paper, a new approach for constructing Lagrangians for driven and undriven linearly damped systems is proposed, by introducing a redefined time coordinate and an associated coordinate transformation to ensure that the resulting Lag…
View article: A perturbative model for the feedback cooling of finite temperature Bose gases
A perturbative model for the feedback cooling of finite temperature Bose gases Open
Ultra-cold atomic gases are an ideal platform for precision measurement devices and analogue quantum simulators, which will prove instrumental in unlocking the secrets of quantum gravity and high-temperature superconductivity. However, cur…