関連する実験動画
Updated: Dec 29, 2025

06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.9K
バイナリーパルサー系内の高速回転する白矮星によって誘発されたレンズ-ティリングフレームのドラッグ
V Venkatraman Krishnan1,2, M Bailes3,4, W van Straten5
1Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. vkrishnan@mpifr-bonn.mpg.de.
まとめ
二重パルサーの軌道の傾きの変化を 検出しました 急速回転する白矮星による 相対論的効果が原因です この発見はバイナリ進化論と 一般相対性理論の予測を裏付けている.
科学分野:
- * 天体物理学
- * 一般相対性理論
- * バイナリースター・エボリューション
背景:
- * 奇妙な二重軌道にある電波パルサーは 重力動力学と恒星の進化の洞察を与えてくれます
- *PSR J1141-6545 システムには,パルサーより前に形成された巨大な白矮星 (WD) との若いラジオパルサーがあります.
研究 の 目的:
- * PSR J1141-6545 バイナリ系における軌道傾斜の時間的進化を調査する.
- * 一般相対性理論,特にレンズ-ティリング (LT) プレセーションの予測をコンパクトバイナリシステムでテストする.
主な方法:
- * 観測天文学は,パルサーの軌道のパラメータを時間とともに監視します.
- * 軌道上のニュートンと相対論的効果を考慮する理論モデル.
主要な成果:
- *PSR J1141-6545の軌道傾斜の時間的な進化を観測した.
- * この進化は,白矮星のニュートン四極運動と相対論的レンズ-ティリング (LT) 前進の組み合わせによって引き起こされていると推論される.
- * 観測された LT 前進は,急速に回転する白矮星と一致する.
結論:
- * LT 前進の検出は,相対論的フレームドラッグ効果の強力な証拠を提供します.
- * 発見は,白矮星がパルサーの祖先から物質を蓄積し,その急速な回転 (<200秒) に導いた進化モデルを支持する.
- * この研究は,強いフィールド体制における一般相対性理論を検証し,二重星進化の理解を進める.
関連する概念動画
Schwarzschild Radius and Event Horizon
2.5K
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
2.5K
Doppler Effect - II
4.3K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.3K
Atomic Nuclei: Larmor Precession Frequency
2.5K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
2.5K
Conservation of Angular Momentum: Application
12.0K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
12.0K
Detection of Black Holes
2.5K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
2.5K
Gravitation Between Spherically Symmetric Masses
1.2K
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
1.2K

