15 citations · 49 across the 12 of their papers we have counts for
12 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 {…
Anisotropic quantum universe in Hořava-Lifshitz gravity
Vikramaditya Mondal, Shinji Mukohyama
We quantize a Bianchi IX universe in Hořava-Lifshitz theory. For analytical tractability, we consider the small anisotropy limit of the Bianchi IX, that is, a perturbative anisotro…
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 Hořava-Lifshitz Gravity
Sugumi Kanno, Hiroki Matsui, Shinji Mukohyama
Hořava-Lifshitz gravity (to be precise, its projectable version) is recognized as a renormalizable, unitary, and asymptotically free quantum field theory of gravity. Notably, one o…
Boulware Vacuum vs. Regularity: Thoughts on Anomaly-Induced Effective Action
Kota Numajiri, Kazumasa Okabayashi, Shinji Mukohyama
We examine the vacuum state and its corresponding renormalized stress-energy tensor (RSET) in static horizonless regular spacetime in both two and four dimensions. Using the local…
Violations of energy conservation in Horava-Lifshitz gravity: a new ingredient in the dark matter puzzle
Paolo M Bassani, Joao Magueijo, Shinji Mukohyama
We investigate the interplay between Horava-Lifshitz (HL) gravity and more general theories where the local Hamiltonian constraint is lost, for example due to the time variability…
Spin wave optics for gravitational waves lensed by a Kerr black hole
Kei-ichiro Kubota, Shun Arai, Hayato Motohashi +1
Gravitational waves exhibit the unique signature of their spin-2 nature in processes of wave scattering, due to the interaction between spin and a background spacetime. Since the s…
Singularity at the demise of a black hole
Justin C. Feng, Shinji Mukohyama, Sante Carloni
We consider a class of quasiregular singularities characterized by points possessing two future-directed light cones and two past-directed light cones. Such singularities appear in…
Hartle-Hawking No-boundary Proposal and Hořava-Lifshitz Gravity
Hiroki Matsui, Shinji Mukohyama
We study the Hartle-Hawking no-boundary proposal in the framework of Hořava-Lifshitz gravity. The former is a prominent hypothesis that describes the quantum creation of the univer…
On spin optics for gravitational waves lensed by a rotating object
Kei-ichiro Kubota, Shun Arai, Shinji Mukohyama
We study gravitational lensing of gravitational waves taking into account the spin of a graviton coupled with a dragged spacetime made by a rotating object. We decompose the phase…