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Massive Ghost Confinement, Dipole Equation and Multipole States in Quadratic Gravity
Ichiro Oda
We investigate the problem of confinement of massive ghost, which violates the unitarity of the physical S-matrix, in quadratic gravity on the basis of a manifestly covariant and l…
Confinement of Massive Ghost in Quadratic Gravity
Ichiro Oda
In the framework of the covariant canonical formalism of quadratic gravity, we consider the problem of confinement of massive ghost which violates the unitarity of the physical S-m…
Color Confinement and Massive Gluon in Superfield Formalism
Ichiro Oda
In connection with the question of confinement of massive ghost in quadratic gravity (QG), color confinement in quantum chromodynamics (QCD) has been reconsidered in the superfield…
Bound States in Scalar Theory with Fourth-order Derivative Term
Ichiro Oda
We consider a problem whether bound states are made in a scalar theory with a fourth-order derivative term or not. After rewriting the theory to a standard scalar theory with secon…
Emergence of General Relativity from Cosmological Constant Via Ghost Condensation
Ichiro Oda
We show that starting with a cosmological constant in a curved space-time, the Einstein-Hilbert term of general relativity is generated through a ghost condensation. We fix Weyl sy…
Vanishing Metric Commutation Relation and Higher-derivative De Donder Gauge in Quadratic Gravity
Ichiro Oda
We show that the equal-time commutation relations (ETCRs) among the time derivatives of the metric tensor identically vanish in the higher-derivative de Donder gauge as well as the…
Manifestly Covariant Canonical Formalism of Quadratic Gravity
Ichiro Oda
We present the manifestly covariant quantization of quadratic gravity or higher-derivative gravity in the de Donder gauge condition (or harmonic gauge condition) for general coordi…
BRST Formalism of Gravity
Ichiro Oda
We perform the manifestly covariant quantization of gravity in the de Donder gauge condition (or harmonic gauge condition) for general coordinate invariance. We explicitly c…
Conformal Symmetry in Quantum Gravity
Ichiro Oda
We study the problem of how to derive conformal symmetry in the framework of quantum gravity. We start with a generic gravitational theory which is invariant under both the general…
Effective Potential for Conformal Factor and GL(4) Symmetry
Ichiro Oda
We revisit the issue that the effective potential for the conformal factor of the metric, which is generated by quantized matter fields, possesses a non-vanishing vacuum expectatio…
Quantum Conformal Gravity
Ichiro Oda, Misaki Ohta
We present the manifestly covariant canonical operator formalism of a Weyl invariant (or equivalently, a locally scale invariant) gravity whose classical action consists of the wel…