1.1k citations · 2k across the 25 of their papers we have counts for
26 papers
Entanglement and parametric resonance in coupled oscillator systems
Roxane Thériault, George Zahariade
We study a system of two quadratically-coupled harmonic oscillators, prepared respectively in the ground state and in a coherent state. This toy model can describe for instance the…
Evolution of a kink-antikink ensemble in a quantum vacuum
Mainak Mukhopadhyay, Kohta Murase, Atsushi Naruko +1
We study the flat spacetime dynamics of a classical field configuration corresponding to an ensemble of sine-Gordon kinks and antikinks, semi-classically coupled to a quantum…
Semiclassical Backreaction: A Qualitative Assessment
Fabio van Dissel, George Zahariade
The backreaction of quantum degrees of freedom on classical backgrounds is a poorly understood topic in theoretical physics. Most often it is treated within the semiclassical appro…
Cosmological scaling of precursor domain walls
Mainak Mukhopadhyay, Oriol Pujolas, George Zahariade
Domain wall (DW) networks have a large impact on cosmology and present interesting dynamics that can be controlled by various scaling regimes. In the first stage after spontaneous…
Domain wall annihilation -- a QFT perspective
Oriol Pujolas, George Zahariade
Domain wall networks in the early universe, formed upon spontaneous breaking of a discrete symmetry, have a rich impact on cosmology. Yet, they remain somewhat unexplored. We intro…
Kink-antikink scattering in a quantum vacuum
Mainak Mukhopadhyay, Evangelos I. Sfakianakis, Tanmay Vachaspati +1
We study kink-antikink scattering in the sine-Gordon model in the presence of interactions with an additional scalar field, , that is in its quantum vacuum. In contrast to the c…
The Harmonic Quantum Szilárd Engine
Paul Davies, Logan Thomas, George Zahariade
The Szilárd engine is a mechanism (akin to Maxwell's demon) for converting information into energy, which seemingly violates the second law of thermodynamics. Originally a classica…
A Heat Shield for de Sitter space
Paul Davies, Logan Thomas, George Zahariade
We investigate a quantum vacuum state for dimensional de Sitter space, corresponding to a region within a perfectly reflecting symmetric box of fixed physical size. We find…
Signatures of the Quantization of Gravity at Gravitational Wave Detectors
Maulik Parikh, Frank Wilczek, George Zahariade
We develop a formalism to calculate the response of a model gravitational wave detector to a quantized gravitational field. Coupling a detector to a quantum field induces stochasti…
Quantum Mechanics of Gravitational Waves
Maulik Parikh, Frank Wilczek, George Zahariade
For the purpose of analyzing observed phenomena, it has been convenient, and thus far sufficient, to regard gravity as subject to the deterministic principles of classical physics,…
Quantum Formation of Topological Defects
Mainak Mukhopadhyay, Tanmay Vachaspati, George Zahariade
We consider quantum phase transitions with global symmetry breakings that result in the formation of topological defects. We evaluate the number densities of kinks, vortices, and m…
The Noise of Gravitons
Maulik Parikh, Frank Wilczek, George Zahariade
We show that when the gravitational field is treated quantum-mechanically, it induces fluctuations -- noise -- in the lengths of the arms of gravitational wave detectors. The chara…
Emergence of classical structures from the quantum vacuum
Mainak Mukhopadhyay, Tanmay Vachaspati, George Zahariade
After a quantum phase transition the quantum vacuum can break up to form classical topological defects. We examine this process for scalar field models with symmetry for diff…
Quantum Evaporation of Classical Breathers
Jan Olle, Oriol Pujolas, Tanmay Vachaspati +1
We apply the recently discovered classical-quantum correspondence (CQC) to study the quantum evaporation of breathers in an extended sine-Gordon model. We present numerical results…
On the Constraint Structure of Vacuum Energy Sequestering
Andrew Svesko, George Zahariade
We carry out the Hamiltonian analysis of the local vacuum energy sequestering model - a manifestly local and diffeomorphism invariant extension of general relativity which has been…
Classical-Quantum Correspondence for Fields
Tanmay Vachaspati, George Zahariade
We map the quantum problem of a free bosonic field in a space-time dependent background into a classical problem. degrees of freedom of a real field in the quantum theory are m…
A Classical-Quantum Correspondence and Backreaction
Tanmay Vachaspati, George Zahariade
We work in the Heisenberg picture to demonstrate the classical-quantum correspondence (CQC) in which the dynamics of a quantum variable is equivalent to that of a complexified clas…
Classical-Quantum Correspondence and Hawking Radiation
Tanmay Vachaspati, George Zahariade
A recently discovered classical-quantum correspondence (CQC) maps certain quantum problems to corresponding classical problems. We illustrate the CQC for a quantum scalar field in…
An Etude on Global Vacuum Energy Sequester
Guido D'Amico, Nemanja Kaloper, Antonio Padilla +3
Recently two of the authors proposed a mechanism of vacuum energy sequester as a means of protecting the observable cosmological constant from quantum radiative corrections. The or…
A Manifestly Local Theory of Vacuum Energy Sequestering
Nemanja Kaloper, Antonio Padilla, David Stefanyszyn +1
We present a manifestly local, diffeomorphism invariant and locally Poincare invariant formulation of vacuum energy sequestering. In this theory, quantum vacuum energy generated by…
Propagation peculiarities of mean field massive gravity
S. Deser, A. Waldron, G. Zahariade
Massive gravity (mGR) describes a dynamical "metric" on a fiducial, background one. We investigate fluctuations of the dynamics about mGR solutions, that is about its "mean field t…
Covariant constraints for generic massive gravity and analysis of its characteristics
S. Deser, M. Sandora, A. Waldron +1
We perform a covariant constraint analysis of massive gravity valid for its entire parameter space, demonstrating that the model generically propagates five degrees of freedom; thi…
Self-calibration: an efficient method to control systematic effects in bolometric interferometry
M. -A. Bigot-Sazy, R. Charlassier, J. -Ch. Hamilton +2
Context. The QUBIC collaboration is building a bolometric interferometer dedicated to the detection of B-mode polarization fluctuations in the Cosmic Microwave Background. Aims. We…
A note on "symmetric" vielbeins in bimetric, massive, perturbative and non perturbative gravities
Cedric Deffayet, Jihad Mourad, George Zahariade
We consider a manifold endowed with two different vielbeins and corresponding to two different metrics and . Such a situation arises generi…