Reviews of Modern Physics, ISSN 0034-6861, 03/2010, Volume 82, Issue 1, pp. 451 - 497

Modified gravity theories have received increased attention lately due to combined motivation coming from high-energy physics, cosmology, and astrophysics....

BIG-BANG NUCLEOSYNTHESIS | PALATINI VARIATIONAL PRINCIPLE | PHYSICS, MULTIDISCIPLINARY | SPHERICALLY SYMMETRIC-SOLUTIONS | POTENTIAL-DENSITY PAIRS | F R GRAVITY | EXACT COSMOLOGICAL SOLUTIONS | PHANTOM DARK ENERGY | HIGHER-ORDER GRAVITY | EINSTEIN-BOLTZMANN EQUATIONS | HIGH-REDSHIFT SUPERNOVAE | Cosmic physics | Research | Degrees of freedom (Mechanics) | Analysis | Gravity

BIG-BANG NUCLEOSYNTHESIS | PALATINI VARIATIONAL PRINCIPLE | PHYSICS, MULTIDISCIPLINARY | SPHERICALLY SYMMETRIC-SOLUTIONS | POTENTIAL-DENSITY PAIRS | F R GRAVITY | EXACT COSMOLOGICAL SOLUTIONS | PHANTOM DARK ENERGY | HIGHER-ORDER GRAVITY | EINSTEIN-BOLTZMANN EQUATIONS | HIGH-REDSHIFT SUPERNOVAE | Cosmic physics | Research | Degrees of freedom (Mechanics) | Analysis | Gravity

Journal Article

Astrophysics and Space Science, ISSN 0004-640X, 3/2015, Volume 356, Issue 1, pp. 103 - 110

This work is based on stability analysis of spherically symmetric collapsing star surrounding in locally anisotropic environment in f(R,T) gravity, where R is...

Collapse | Extraterrestrial Physics, Space Sciences | Astrophysics and Astroparticles | Adiabatic index | Astrobiology | Cosmology | Dynamical equations | Instability range | f ( R , T ) gravity | Physics | Astronomy, Observations and Techniques | f(R,T) gravity | WAVES | GRAVITATIONAL COLLAPSE | EVOLUTION | FLUID | SHEAR-FREE | ASTRONOMY & ASTROPHYSICS | f (R, T) gravity | HIGHER-ORDER GRAVITY | Anisotropy | Analysis | Gravity | Dynamical systems | Stars & galaxies | Gravitation | Tensors | Stability | Perturbation methods | Mathematical analysis | Stars | Scalars | Instability | Physics - General Physics

Collapse | Extraterrestrial Physics, Space Sciences | Astrophysics and Astroparticles | Adiabatic index | Astrobiology | Cosmology | Dynamical equations | Instability range | f ( R , T ) gravity | Physics | Astronomy, Observations and Techniques | f(R,T) gravity | WAVES | GRAVITATIONAL COLLAPSE | EVOLUTION | FLUID | SHEAR-FREE | ASTRONOMY & ASTROPHYSICS | f (R, T) gravity | HIGHER-ORDER GRAVITY | Anisotropy | Analysis | Gravity | Dynamical systems | Stars & galaxies | Gravitation | Tensors | Stability | Perturbation methods | Mathematical analysis | Stars | Scalars | Instability | Physics - General Physics

Journal Article

Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, 02/2019, Volume 2019, Issue 2, pp. 36 - 36

We show that theories of mimetic gravity can be viewed as degenerate higher-order scalar-tensor (DHOST) theories that admit an extra local (gauge) symmetry in...

Cosmological perturbation theory | Dark energy theory | Modified gravity | modified gravity | dark energy theory | cosmological perturbation theory | ASTRONOMY & ASTROPHYSICS | PHYSICS, PARTICLES & FIELDS

Cosmological perturbation theory | Dark energy theory | Modified gravity | modified gravity | dark energy theory | cosmological perturbation theory | ASTRONOMY & ASTROPHYSICS | PHYSICS, PARTICLES & FIELDS

Journal Article

International Journal of Modern Physics D, ISSN 0218-2718, 04/2019, Volume 28, Issue 5, p. 1942006

This paper reviews scalar–tensor theories characterized by a Lagrangian that, despite the presence of second-order derivatives, contains a single scalar degree...

modified gravity | dark energy | ASTRONOMY & ASTROPHYSICS | Alternative gravity theories | Analysis | Dark energy

modified gravity | dark energy | ASTRONOMY & ASTROPHYSICS | Alternative gravity theories | Analysis | Dark energy

Journal Article

Astronomy and Astrophysics, ISSN 0004-6361, 08/2006, Volume 454, Issue 3, pp. 707 - 714

We investigate f (R) theories of gravity within the Palatini approach and show how one can determine the expansion history, H( a), for an arbitrary choice of f...

Gravitation | Cosmology: theory | Cosmological parameters | Cosmology: observations | Large-scale structure of Universe | MATTER | GALAXY REDSHIFT SURVEY | PERTURBATIONS | cosmology : theory | large-scale structure of Universe | DARK ENERGY | cosmology : observations | MODEL | BIRKHOFF THEOREM | ACCELERATION | SPACE | gravitation | ASTRONOMY & ASTROPHYSICS | DYNAMICS | cosmological parameters | HIGHER-ORDER GRAVITY

Gravitation | Cosmology: theory | Cosmological parameters | Cosmology: observations | Large-scale structure of Universe | MATTER | GALAXY REDSHIFT SURVEY | PERTURBATIONS | cosmology : theory | large-scale structure of Universe | DARK ENERGY | cosmology : observations | MODEL | BIRKHOFF THEOREM | ACCELERATION | SPACE | gravitation | ASTRONOMY & ASTROPHYSICS | DYNAMICS | cosmological parameters | HIGHER-ORDER GRAVITY

Journal Article

Water Resources Research, ISSN 0043-1397, 05/2011, Volume 47, Issue 5, p. n/a

A wide range of applications in subsurface flow involve water, a nonaqueous phase liquid (NAPL) or oil, and a gas phase, such as air or CO2. The numerical...

compositional modeling | three‐phase flow | higher‐order methods | FRACTURED MEDIA | STORAGE | COUPLED FLOW | ENVIRONMENTAL SCIENCES | REACTIVE TRANSPORT | INJECTION | SUBSURFACE | DISCONTINUOUS GALERKIN METHODS | RELATIVE PERMEABILITY | WATER RESOURCES | LIMNOLOGY

compositional modeling | three‐phase flow | higher‐order methods | FRACTURED MEDIA | STORAGE | COUPLED FLOW | ENVIRONMENTAL SCIENCES | REACTIVE TRANSPORT | INJECTION | SUBSURFACE | DISCONTINUOUS GALERKIN METHODS | RELATIVE PERMEABILITY | WATER RESOURCES | LIMNOLOGY

Journal Article

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN 1475-7516, 07/2019, Volume 2019, Issue 7, pp. 24 - 24

Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the...

SPACE | POST-NEWTONIAN EVOLUTION | ASTRONOMY & ASTROPHYSICS | BLACK-HOLE TRIPLETS | dark energy theory | GALACTIC NUCLEI | gravitational waves / theory | gravitational wave detectors | QUANTUM-GRAVITY | PHYSICS, PARTICLES & FIELDS | ASTRONOMY AND ASTROPHYSICS

SPACE | POST-NEWTONIAN EVOLUTION | ASTRONOMY & ASTROPHYSICS | BLACK-HOLE TRIPLETS | dark energy theory | GALACTIC NUCLEI | gravitational waves / theory | gravitational wave detectors | QUANTUM-GRAVITY | PHYSICS, PARTICLES & FIELDS | ASTRONOMY AND ASTROPHYSICS

Journal Article

Journal of Mathematical Physics, ISSN 0022-2488, 03/2018, Volume 59, Issue 3, p. 32502

We present a covariant multisymplectic formulation for the Einstein-Hilbert model of general relativity. As it is described by a second-order singular...

FORMULATION | PHYSICS, MATHEMATICAL | VARIATIONAL-PRINCIPLES | Fiber spaces (Mathematics) | Classificació AMS | Camps, Teoria dels (Física) | 83C General relativity | Einstein equations | Field theory (Physics) | Espais fibrats (Matemàtica) | 83 Relativity and gravitational theory | General relativity (Physics) | Symplectic geometry | 70S Classical field theories | 53D Symplectic geometry, contact geometry | 55 Algebraic topology | Matemàtica aplicada a les ciències | 53 Differential geometry | Higher-order jet bundles | Multisymplectic forms | Hilbert- Einstein action | Relativitat general (Física) | 70 Mechanics of particles and systems | Geometria | 2nd-order classical field theories | Geometria simplèctica | Matemàtiques i estadística | 55R Fiber spaces and bundles | Àrees temàtiques de la UPC

FORMULATION | PHYSICS, MATHEMATICAL | VARIATIONAL-PRINCIPLES | Fiber spaces (Mathematics) | Classificació AMS | Camps, Teoria dels (Física) | 83C General relativity | Einstein equations | Field theory (Physics) | Espais fibrats (Matemàtica) | 83 Relativity and gravitational theory | General relativity (Physics) | Symplectic geometry | 70S Classical field theories | 53D Symplectic geometry, contact geometry | 55 Algebraic topology | Matemàtica aplicada a les ciències | 53 Differential geometry | Higher-order jet bundles | Multisymplectic forms | Hilbert- Einstein action | Relativitat general (Física) | 70 Mechanics of particles and systems | Geometria | 2nd-order classical field theories | Geometria simplèctica | Matemàtiques i estadística | 55R Fiber spaces and bundles | Àrees temàtiques de la UPC

Journal Article

International Journal of Modern Physics A, ISSN 0217-751X, 08/2016, Volume 31, Issue 23, p. 1650130

We consider the higher-order gravity theory derived from the quadratic Lagrangian R + R 2 in vacuum as a first-order (ADM-type) system with constraints, and...

Higher order gravity theories | Initial-value problem | Regular solutions | initial-value problem | EINSTEIN EQUATIONS | INFLATION | regular solutions | PHYSICS, NUCLEAR | TIME | PHYSICS, PARTICLES & FIELDS

Higher order gravity theories | Initial-value problem | Regular solutions | initial-value problem | EINSTEIN EQUATIONS | INFLATION | regular solutions | PHYSICS, NUCLEAR | TIME | PHYSICS, PARTICLES & FIELDS

Journal Article

CLASSICAL AND QUANTUM GRAVITY, ISSN 0264-9381, 01/2020, Volume 37, Issue 1, p. 15002

A new class of higher-curvature modifications of )-dimensional Einstein gravity has been recently identified. Densities belonging to this 'Generalized...

SYMMETRICAL-SOLUTIONS | gravitational effective actions | ENERGY | QUANTUM SCIENCE & TECHNOLOGY | PHYSICS, MULTIDISCIPLINARY | ASTRONOMY & ASTROPHYSICS | black holes | higher-order gravities | PHYSICS, PARTICLES & FIELDS

SYMMETRICAL-SOLUTIONS | gravitational effective actions | ENERGY | QUANTUM SCIENCE & TECHNOLOGY | PHYSICS, MULTIDISCIPLINARY | ASTRONOMY & ASTROPHYSICS | black holes | higher-order gravities | PHYSICS, PARTICLES & FIELDS

Journal Article

Annals of Physics, ISSN 0003-4916, 12/2019, Volume 411, p. 167971

Different routes towards canonical formulation of a classical theory result in different canonically equivalent Hamiltonians, while their quantum counterparts...

Higher order theory | Canonical formulation | Canonical quantization | Total derivative terms | PHYSICS, MULTIDISCIPLINARY | QUANTUM COSMOLOGY

Higher order theory | Canonical formulation | Canonical quantization | Total derivative terms | PHYSICS, MULTIDISCIPLINARY | QUANTUM COSMOLOGY

Journal Article

Physics Letters B, ISSN 0370-2693, 06/2015, Volume 746, pp. 190 - 193

The issue of Lorentz fine-tuning in effective theories containing higher-order operators is studied. To this end, we focus on the Myers–Pospelov extension of...

Lorentz violations | Higher-order operators | QED extension | ASTRONOMY & ASTROPHYSICS | RADIATIVELY-INDUCED LORENTZ | PHYSICS, NUCLEAR | CPT VIOLATION | PHYSICS, PARTICLES & FIELDS | Phenomenology | High Energy Physics - Phenomenology | High Energy Physics | Nuclear and High Energy Physics | High Energy Physics - Theory | Physics

Lorentz violations | Higher-order operators | QED extension | ASTRONOMY & ASTROPHYSICS | RADIATIVELY-INDUCED LORENTZ | PHYSICS, NUCLEAR | CPT VIOLATION | PHYSICS, PARTICLES & FIELDS | Phenomenology | High Energy Physics - Phenomenology | High Energy Physics | Nuclear and High Energy Physics | High Energy Physics - Theory | Physics

Journal Article

Journal of Geodesy, ISSN 0949-7714, 1/2015, Volume 89, Issue 1, pp. 33 - 48

The GOCE satellite was orbiting the Earth in a Sun-synchronous orbit at a very low altitude for more than 4 years. This low orbit and the availability of...

Time variable gravity | Gravity field | Earth Sciences | Accelerometer data | Higher-order ionosphere (HOI) | Geophysics/Geodesy | Earth Sciences, general | GOCE | GPS | Geomagnetic equator | GEOCHEMISTRY & GEOPHYSICS | REMOTE SENSING | PRECISE ORBIT DETERMINATION | Atmosphere, Upper | Analysis | Gravity | Global Positioning System | Aerospace engineering | Geodetics | Satellites | Global positioning systems--GPS | Ionosphere

Time variable gravity | Gravity field | Earth Sciences | Accelerometer data | Higher-order ionosphere (HOI) | Geophysics/Geodesy | Earth Sciences, general | GOCE | GPS | Geomagnetic equator | GEOCHEMISTRY & GEOPHYSICS | REMOTE SENSING | PRECISE ORBIT DETERMINATION | Atmosphere, Upper | Analysis | Gravity | Global Positioning System | Aerospace engineering | Geodetics | Satellites | Global positioning systems--GPS | Ionosphere

Journal Article