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Relativity and Gravitation x clear all

An Approach toward the Laboratory Search for the Scalar Field as a Candidate of Dark Energy

Yasunori Fujii and Kensuke Homma.

in Progress of Theoretical Physics

September 2011; p ublished online September 2011 .

Journal Article. Subjects: Particles and Fields; Relativity and Gravitation. 0 words.

The observed accelerating universe indicates the presence of Dark Energy which is probably interpreted in terms of an extremely light gravitational scalar field. We suggest a way to probe...

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Black Holes in the Dilatonic Einstein-Gauss-Bonnet Theory in Various Dimensions. II

Zong-Kuan Guo, Nobuyoshi Ohta and Takashi Torii.

in Progress of Theoretical Physics

February 2009; p ublished online February 2009 .

Journal Article. Subjects: Cosmology; Relativity and Gravitation; Particles and Fields. 0 words.

We study asymptotically AdS topological black hole solutions with k = 0 (plane symmetric) in the Einstein gravity with Gauss-Bonnet term, the dilaton and a “cosmological constant” in...

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Black Holes in the Dilatonic Einstein-Gauss-Bonnet Theory in Various Dimensions. IV

Nobuyoshi Ohta and Takashi Torii.

in Progress of Theoretical Physics

December 2009; p ublished online December 2009 .

Journal Article. Subjects: Cosmology; Relativity and Gravitation; Particles and Fields. 0 words.

We study black hole solutions in the Einstein gravity with Gauss-Bonnet term, the dilaton and a positive “cosmological constant” in various dimensions. Physically meaningful black holes...

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Calculation of radiation reaction effect on orbital parameters in Kerr spacetime

Norichika Sago and Ryuichi Fujita.

in Progress of Theoretical and Experimental Physics

July 2015; p ublished online July 2015 .

Journal Article. Subjects: Astronomy and Astrophysics; Relativity and Gravitation. 15200 words.

We calculate the secular changes of the orbital parameters of a point particle orbiting a Kerr black hole, due to the gravitational radiation reaction. For this purpose, we use the...

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Can an off-axis gamma-ray burst jet in GW170817 explain all the electromagnetic counterparts?

Kunihito Ioka and Takashi Nakamura.

in Progress of Theoretical and Experimental Physics

P ublished online April 2018 .

Journal Article. Subjects: Relativity and Gravitation; Stars; Astronomy and Astrophysics. 12292 words.

Abstract

Gravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic...

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Catastrophic Instability of Small Lovelock Black Holes

Tomohiro Takahashi and Jiro Soda.

in Progress of Theoretical Physics

October 2010; p ublished online October 2010 .

Journal Article. Subjects: Relativity and Gravitation; Particles and Fields. 0 words.

We study the stability of static black holes in Lovelock theory which is a natural higher dimensional generalization of Einstein theory. We show that Lovelock black holes are stable under...

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Charged rotating BTZ black holes in noncommutative spaces and torsion gravity

Shoichi Kawamoto, Koichi Nagasaki and Wen-Yu Wen.

in Progress of Theoretical and Experimental Physics

P ublished online April 2018 .

Journal Article. Subjects: Particles and Fields; Relativity and Gravitation; Astronomy and Astrophysics. 7767 words.

Abstract

We consider charged rotating BTZ black holes in noncommutative space using a Chern–Simons theory formulation of [math]-dimensional gravity. The...

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CMB B-mode auto-bispectrum produced by primordial gravitational waves

Hiroaki W H Tahara and Jun’ichi Yokoyama.

in Progress of Theoretical and Experimental Physics

P ublished online January 2018 .

Journal Article. Subjects: Relativity and Gravitation; Cosmology. 2987 words.

Abstract

Gravitational waves from inflation induce polarization patterns in the cosmic microwave background (CMB). It is known that there are only two types of...

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Covariant approach to the no-ghost theorem in massive gravity

Taichiro Kugo and Nobuyoshi Ohta.

in Progress of Theoretical and Experimental Physics

P ublished online April 2014 .

Journal Article. Subjects: Relativity and Gravitation; Particles and Fields. 8959 words.

We discuss the no-ghost theorem in massive gravity in a covariant manner. Using the Becchi-Rouet-Stora-Tyutin (BRST) formalism and Stückelberg fields, we first clarify how the...

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de Sitter Thermodynamics in the Canonical Ensemble

Hiromi Saida.

in Progress of Theoretical Physics

November 2009; p ublished online November 2009 .

Journal Article. Subjects: Cosmology; Relativity and Gravitation. 0 words.

The existing thermodynamics of the cosmological horizon in de Sitter spacetime is established in the micro-canonical ensemble, while the thermodynamics of black hole horizons is established...

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