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19922026
Showing 2013 · gr-qcShow all

33 papers · 2 filters

gr-qc2013★ 104 cited

Cosmographic Constraints and Cosmic Fluids

Salvatore Capozziello, Mariafelicia De Laurentis, Orlando Luongo +1

The problem of reproducing dark energy effects is reviewed here with particular interest devoted to cosmography. We summarize some of the most relevant cosmological models, based o…

gr-qc2013★ 51 cited

The Cauchy problem in hybrid metric-Palatini f(X)-gravity

Salvatore Capozziello, Tiberiu Harko, Francisco S. N. Lobo +2

The well-formulation and the well-posedness of the Cauchy problem is discussed for {\it hybrid metric-Palatini gravity}, a recently proposed modified gravitational theory consistin…

gr-qc2013★ 188 cited

Energy conditions in modified gravity

Salvatore Capozziello, Francisco S. N. Lobo, José P. Mimoso

We consider generalized energy conditions in modified theories of gravity by taking into account the further degrees of freedom related to scalar fields and curvature invariants. T…

gr-qc2013★ 147 cited

Noether symmetries and analytical solutions in f(T)-cosmology: A complete study

S. Basilakos, S. Capozziello, M. De Laurentis +2

We investigate the main features of the flat Friedmann-Lemaıtre-Robertson-Walker cosmological models in the f(T) teleparallel gravity. In particular, a general approach to find out…

gr-qc2013★ 10 cited

Effective field theory from modified gravity with massive modes

Salvatore Capozziello, Mariafelicia De Laurentis, Mariacristina Paolella +1

Massive gravitational modes in effective field theories can be recovered by extending General Relativity and taking into account generic functions of the curvature invariants, not…

gr-qc2013★ 29 cited

Application of a Hough search for continuous gravitational waves on data from the 5th LIGO science run

The LIGO Scientific Collaboration, The Virgo Collaboration, J. Aasi +876

We report on an all-sky search for periodic gravitational waves in the frequency range with the first derivative of frequency in the range $-8.9 \times 10^{-1…

gr-qc2013★ 68 cited

Newtonian, Post Newtonian and Parameterized Post Newtonian limits of f(R, G) gravity

Mariafelicia De Laurentis, Antonio Jesus Lopez-Revelles

We discuss in detail the weak field limit of f(R,G) gravity taking into account analytic functions of the Ricci scalar R and the Gauss-Bonnet invariant G. Specifically, we develop,…

gr-qc2013★ 142 cited

No further gravitational wave modes in gravity

Kazuharu Bamba, Salvatore Capozziello, Mariafelicia De Laurentis +2

We explore the possibility of further gravitational wave modes in gravity, where is the torsion scalar in teleparallelism. It is explicitly demonstrated that gravitation…

gr-qc2013★ 11 cited

Measuring general relativity effects in a terrestrial lab by means of laser gyroscopes

N Beverini, M Allegrini, A Beghi +12

GINGER is a proposed tridimensional array of laser gyroscopes with the aim of measuring the Lense-Thirring effect, predicted by the General Relativity theory, in a terrestrial labo…

gr-qc2013★ 31 cited

Conformal Transformations and Weak Field Limit of Scalar-Tensor Gravity

A. Stabile, An. Stabile, S. Capozziello

The weak field limit of scalar tensor theories of gravity is discussed in view of conformal transformations. Specifically, we consider how physical quantities, like gravitational p…

gr-qc2013★ 85 cited

Constraints on cosmic strings from the LIGO-Virgo gravitational-wave detectors

J. Aasi, J. Abadie, B. P. Abbott +873

Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising o…

gr-qc2013★ 27 cited

Probing the physical and mathematical structure of gravity by PSR

Mariafelicia De Laurentis, Ivan De Martino

There are several approaches to extend General Relativity in order to explain the phenomena related to the Dark Matter and Dark Energy. These theories, generally called Extended Th…

gr-qc2013★ 75 cited

A directed search for continuous Gravitational Waves from the Galactic Center

The LIGO Scientific Collaboration, The Virgo Collaboration, J. Aasi +871

We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic Center region, performed on two years of data fr…

gr-qc2013★ 229 cited

Cosmographic analysis of the equation of state of the universe through Padé approximations

Christine Gruber, Orlando Luongo

Cosmography is used in cosmological data processing in order to constrain the kinematics of the universe in a model-independent way, providing an objective means to evaluate the ag…

gr-qc2013★ 6 cited

Weak Forces and Neutrino Oscillations under the standards of Hybrid Gravity with Torsion

Salvatore Capozziello, Luca Fabbri, Stefano Vignolo

We present a unifying approach where weak forces and neutrino oscillations are interpreted under the same standards of torsional hybrid gravity. This gravitational theory mixes met…

gr-qc2013★ 378 cited

Further stable neutron star models from f(R) gravity

Artyom V. Astashenok, Salvatore Capozziello, Sergei D. Odintsov

Neutron star models in perturbative gravity are considered with realistic equations of state. In particular, we consider the FPS, SLy and other equations of state and a case…

gr-qc2013★ 38 cited

Exact cosmological solutions from Hojman conservation quantities

Salvatore Capozziello, Mahmood Roshan

We present a new approach to find exact solutions for cosmological models. By requiring the existence of a symmetry transformation vector for the equations of motion of the given c…

gr-qc2013★ 58 cited

Conformally related metrics and Lagrangians and their physical interpretation in cosmology

Michael Tsamparlis, Andronikos Paliathanasis, Spyros Basilakos +1

Conformally related metrics and Lagrangians are considered in the context of scalar-tensor gravity cosmology. After the discussion of the problem, we pose a lemma in which we show…

gr-qc2013★ 90 cited

Galactic rotation curves in hybrid metric-Palatini gravity

Salvatore Capozziello, Tiberiu Harko, Tomi S. Koivisto +2

Generally, the dynamics of test particles around galaxies, as well as the corresponding mass deficit, is explained by postulating the existence of a hypothetical dark matter. In fa…

gr-qc2013★ 103 cited

Hybrid modified gravity unifying local tests, galactic dynamics and late-time cosmic acceleration

Salvatore Capozziello, Tiberiu Harko, Francisco S. N. Lobo +1

The non-equivalence between the metric and Palatini formalisms of gravity is an intriguing feature of these theories. However, in the recently proposed hybrid metric-Palatin…

gr-qc2013★ 21 cited

Higher-Order Gauss-Bonnet Cosmology

Salvatore Capozziello, Mauro Francaviglia, Andrey N. Makarenko

We study cosmological models derived from higher-order Gauss-Bonnet gravity by using the Lagrange multiplier approach without assuming the presence of additional fields wi…

gr-qc2013★ 160 cited

Parameter estimation for compact binary coalescence signals with the first generation gravitational-wave detector network

the LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +801

Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich i…

gr-qc2013★ 1 cited

Prospects for Observing and Localizing Gravitational-Wave Transients with Advanced LIGO, Advanced Virgo and KAGRA

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1319

We present our current best estimate of the plausible observing scenarios for the Advanced LIGO, Advanced Virgo and KAGRA gravitational-wave detectors over the next several years,…

gr-qc2013★ 53 cited

Gauss-Bonnet dark energy by Lagrange multipliers

Salvatore Capozziello, Andrey N. Makarenko, Sergei D. Odintsov

A string-inspired effective theory of gravity, containing Gauss-Bonnet invariant interacting with a scalar field, is considered in view of obtaining cosmological dark energy soluti…