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Classical and Quantum Gravity, ISSN 0264-9381, 09/2009, Volume 26, Issue 17, pp. 175013 - 175013 (11)
The Cauchy problem for metric-affine f(R)-gravity in the manner of Palatini and with torsion, in the presence of perfect fluid matter acting as a source, is... 
ENERGY | F(R) GRAVITY | PHYSICS, MULTIDISCIPLINARY | ASTRONOMY & ASTROPHYSICS | HIGHER-DERIVATIVE GRAVITY | TORSION | PHYSICS, PARTICLES & FIELDS
Journal Article
Nuclear Physics, Section B, ISSN 0550-3213, 1991, Volume 355, Issue 1, pp. 133 - 145
If the topology of space-time is allowed to change, then there may exist an ensemble of large universes connected by wormholes. The probability distribution... 
HIGHER-DERIVATIVE TERMS | WAVE-FUNCTION | COSMOLOGICAL CONSTANT | SUPERSTRING THEORY | SEMI-CLASSICAL APPROXIMATION | PHYSICS, NUCLEAR | BABY UNIVERSES | QUANTUM-GRAVITY | STOCHASTIC QUANTIZATION | INFLATIONARY UNIVERSE | STRING THEORY
Journal Article
Journal of Physics A: Mathematical and General, ISSN 0305-4470, 09/1991, Volume 24, Issue 18, pp. 4261 - 4274
For a canonical formalism with a higher-order derivative, the corresponding generalized first Noether theorem (GFNT) for a constrained Hamiltonian system and... 
DIRAC CONJECTURE | GENERATORS | INVARIANT | DYNAMICS | FORMALISM | PHYSICS | HIGHER DERIVATIVES | GRAVITY | EQUATION
Journal Article
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS, ISSN 0015-8208, 1991, Volume 39, Issue 4, pp. 319 - 347
Homogeneous isotropic, anisotropic and inhomogeneous cosmological models are studied using Einstein's general relativity with quantum corrections in field... 
4TH-ORDER GRAVITY | PARTICLE HORIZONS | I VACUUM SOLUTIONS | SITTER SPACE | PHASE-TRANSITION | SCALAR FIELD | PHYSICS | HIGHER DERIVATIVES | INFLATIONARY UNIVERSE | R+R2 THEORIES | SYMMETRY-BREAKING
Journal Article
Physical Review D, ISSN 0556-2821, 1991, Volume 44, Issue 4, pp. 1020 - 1027
To study the generality of inflation from Lagrangians containing higher powers of curvature, the effects of the square of the Weyl tensor, C2 =... 
4TH-ORDER GRAVITY | INITIAL CONDITIONS | MODELS | R+EPSILON-R2 COSMOLOGY | PHASE-TRANSITION | ATTRACTOR | FLATNESS | HIGHER DERIVATIVES | UNIVERSE | HORIZON | PHYSICS, PARTICLES & FIELDS
Journal Article
ASTROPHYSICS AND SPACE SCIENCE, ISSN 0004-640X, 01/1992, Volume 187, Issue 1, pp. 135 - 141
The action with general Lagrangian is transformed to the canonical form. The classical field equations are analysed for a particular choice of the Lagrangian.... 
MICROSUPERSPACE | ASTRONOMY & ASTROPHYSICS | STEEPEST-DESCENT CONTOURS | MODEL | HIGHER DERIVATIVES | UNIVERSE | QUANTUM COSMOLOGY
Journal Article
PHYSICAL REVIEW D, ISSN 0556-2821, 01/1992, Volume 45, Issue 2, pp. 507 - 512
The phase diagram and critical exponents for pure simplicial quantum gravity (Regge calculus) in four dimensions are discussed. In the small-G phase, where G... 
4 DIMENSIONS | HIGHER DERIVATIVE TERMS | FORMALISM | REGGE CALCULUS | QUANTIZATION | PHYSICS, PARTICLES & FIELDS
Journal Article
Physical Review D, ISSN 0556-2821, 1993, Volume 47, Issue 4, pp. 1339 - 1355
We consider the Einstein equation with first-order (semiclassical) quantum corrections. Although the quantum corrections contain up to fourth-order derivatives... 
CURVED-SPACETIME | FLAT SPACE | PARTICLE HORIZONS | VACUUM ENERGY | SEMICLASSICAL GRAVITY | EARLY UNIVERSE | TRACE ANOMALIES | FIELD | STABILITY | HIGHER DERIVATIVES | PHYSICS, PARTICLES & FIELDS | Physics - General Relativity and Quantum Cosmology
Journal Article
Physical Review D, ISSN 0556-2821, 1993, Volume 48, Issue 4, pp. 1700 - 1709
This paper is an application of the ideas of the Born-Oppenheimer (or slow-fast) approximation in molecular physics and of the Isaacson (or short-wave)... 
DECOHERENCE | ORIGIN | PERTURBATIONS | LIMIT | HIGHER DERIVATIVES | GRAVITY | UNIVERSE | PHYSICS, PARTICLES & FIELDS | Physics - General Relativity and Quantum Cosmology
Journal Article
PHYSICAL REVIEW D, ISSN 2470-0010, 01/1993, Volume 47, Issue 2, pp. 510 - 532
The weak-field expansion and the nonperturbative ground state of three-dimensional simplicial quantum gravity are discussed. The correspondence between lattice... 
HIGHER DERIVATIVE TERMS | MODELS | RANDOM SURFACES | BEHAVIOR | ASTRONOMY & ASTROPHYSICS | REGGE CALCULUS | QUANTIZATION | LATTICE | EINSTEIN GRAVITY | RENORMALIZATION | ENTROPY | PHYSICS, PARTICLES & FIELDS
Journal Article
Physical Review D, ISSN 0556-2821, 1994, Volume 49, Issue 4, pp. 1861 - 1880
Journal Article
Physical Review D, ISSN 0556-2821, 1994, Volume 50, Issue 8, pp. 5039 - 5059
We argue that in a nonlinear gravity theory (the Lagrangian being an arbitrary function of the curvature scalar R), which according to well-known results is... 
HIGHER-DIMENSIONAL THEORIES | CONFORMAL TRANSFORMATIONS | EXTENDED INFLATION | HIGHER-DERIVATIVE GRAVITY | BRANS-DICKE THEORY | DECAYING COSMOLOGICAL CONSTANT | POSITIVE-ENERGY THEOREM | KALUZA-KLEIN THEORY | BLACK-HOLES | HIGHER-ORDER GRAVITY | PHYSICS, PARTICLES & FIELDS
Journal Article
Classical and Quantum Gravity, ISSN 0264-9381, 10/1994, Volume 11, Issue 10, pp. 2483 - 2497
In this paper the quantum cosmological consequences of introducing a term cubic in the Ricci curvature scalar R into the Einstein-Hilbert action are... 
4TH-ORDER GRAVITY | GENERAL-RELATIVITY | MODELS | CREATION | STATE | LIMIT | PHYSICS | HIGHER DERIVATIVES | INFLATIONARY UNIVERSE | Physics - General Relativity and Quantum Cosmology
Journal Article
NUCLEAR PHYSICS B, ISSN 0550-3213, 04/1994, Volume 418, Issue 1-2, pp. 257 - 277
We derive curvature counterterms in two-dimensional gravity coupled to conformal matter up to infinite order. By construction the higher-order action is... 
ARBITRARY DIMENSIONS | 2-DIMENSIONAL GRAVITY | BACKGROUND FIELDS | PLANAR RANDOM SURFACES | FIELD-THEORY | HIGHER-DERIVATIVE GRAVITY | PHYSICS, NUCLEAR | QUANTIZATION | LIOUVILLE THEORY | NONCRITICAL STRINGS | VERTEX OPERATORS
Journal Article
General Relativity and Gravitation, ISSN 0001-7701, 06/1994, Volume 26, Issue 6, pp. 587 - 597
By using the [General Relativity + additional matter fields] formulation (which depends on a redefined metric h(munu)) of metric theories of gravitation, the... 
4TH-ORDER GRAVITY | ENERGY | R2 COSMOLOGY | INFLATION | LORENTZIAN WORMHOLES | HIGHER-DERIVATIVE GRAVITY | LAGRANGIANS | ATTRACTOR | PHYSICS
Journal Article
Zeitschrift für Physik C Particles and Fields, ISSN 0170-9739, 12/1995, Volume 67, Issue 4, pp. 701 - 705
We quantize the Einstein gravity in the formalism of weak gravitational fields by using the constrained Hamiltonian method. Special emphasis is given to the... 
GAUGE-THEORIES | FORMALISM | HIGHER DERIVATIVES | PHYSICS, PARTICLES & FIELDS | Physics - High Energy Physics - Theory
Journal Article
PHYSICAL REVIEW D, ISSN 2470-0010, 09/1994, Volume 50, Issue 6, pp. 3874 - 3888
I describe the treatment of gravity as a quantum effective field theory. This allows a natural separation of the (known) low energy quantum effects from the... 
SYSTEM | PERTURBATION-THEORY | SINGULARITIES | ASTRONOMY & ASTROPHYSICS | LAGRANGIANS | HIGHER DERIVATIVES | GRAVITY | NONRENORMALIZABILITY | PHYSICS, PARTICLES & FIELDS
Journal Article
Physical Review D, ISSN 0556-2821, 1995, Volume 52, Issue 6, pp. 3518 - 3528
We examine the zeroth law and the second law of black hole thermodynamics within the context of effective gravitational actions including higher curvature... 
TRANSFORMATION | GENERALIZED 2ND LAW | THERMODYNAMICS | 2ND-ORDER | NONLOCALITY | SPHERICALLY SYMMETRIC-SOLUTIONS | HIGHER-DERIVATIVE GRAVITY | ACCELERATION RADIATION | LAGRANGIANS | RELATIVITY | PHYSICS, PARTICLES & FIELDS
Journal Article
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