10 papers
Quantum mechanics with a ghost: Counterexamples to spectral denseness
Cédric Deffayet, Atabak Fathe Jalali, Aaron Held +2
We quantise integrable point-particle systems with opposite-sign kinetic terms and nontrivial interactions. Using methods from separability theory, we show that previously determin…
Unitary Time Evolution and Vacuum for a Quantum Stable Ghost
Cédric Deffayet, Atabak Fathe Jalali, Aaron Held +2
We quantize a classically stable system of a harmonic oscillator polynomially coupled to a ghost with negative kinetic energy. We prove that due to an integral of motion with a pos…
The emergent Big Bang scenario
Justin C. Feng, Shinji Mukohyama, Jean-Philippe Uzan
This paper proposes a new avenue for understanding the cosmological singularity. The standard cosmological model contains a generic initial singularity usually referred to as the {…
Emergent Lorentzian dispersion relations from a Euclidean scalar-tensor theory
Justin C. Feng, Shinji Mukohyama, Sante Carloni
Can one be fooled into thinking that space and time are fundamentally described by a Lorentzian manifold? In this article, we describe a scenario in which a theory constructed on a…
HBT Interferometry and Quantum Nature of Primordial Gravitational Waves in HoÅava-Lifshitz Gravity
Sugumi Kanno, Hiroki Matsui, Shinji Mukohyama
HoÅava-Lifshitz gravity (to be precise, its projectable version) is recognized as a renormalizable, unitary, and asymptotically free quantum field theory of gravity. Notably, one…
Anisotropic quantum universe in HoÅava-Lifshitz gravity
Vikramaditya Mondal, Shinji Mukohyama
We quantize a Bianchi IX universe in HoÅava-Lifshitz theory. For analytical tractability, we consider the small anisotropy limit of the Bianchi IX, that is, a perturbative anisotr…