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関連する概念動画

Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

558
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
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Gravitation01:16

Gravitation

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In the years before Newton, a general belief prevailed that different laws governed objects in the sky than objects on Earth. When Kepler wrote down the three laws of planetary motion, explaining in detail the geometrical properties of the planetary orbits around the Sun, there was no immediate idea to discern their connection with more fundamental laws. It was Isaac Newton who, in 1665–66, figured out the connection between planetary motion, the motion of the moon around the Earth, and...
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Newton's Law of Gravitation01:15

Newton's Law of Gravitation

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Our everyday observation tells us that all objects close to the Earth naturally tend to fall to the ground. Early philosophers assumed that this downward force was unique to Earth. By the 16th century, Nicolaus Copernicus (1473-1543) put forward the heliocentric theory, which suggested that Earth and other planets orbited the sun, while the Moon orbited the Earth. However, it was Isaac Newton (1642-1727) who linked these two motions together in the 17th century. He reasoned that the force of...
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Newton's Law of Gravitational Attraction01:24

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Sir Isaac Newton established the universality of the law of gravitational attraction based on empirical evidence and inductive reasoning. He published his work in Philosophiae Naturalis Principia Mathematica ("the Principia") on July 5, 1687.
Newton's law of gravitational attraction is a fundamental law of physics that governs the attraction between objects. It states that the magnitude of the gravitational force between any two objects is proportional to their masses and inversely...
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Comparison Between Electrical And Gravitational Forces01:24

Comparison Between Electrical And Gravitational Forces

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There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To compare the numerical strengths of the first two, take two particles of the same kind. Since electrons are fundamental particles, they are a good example.
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Atomic Nuclei: Larmor Precession Frequency01:11

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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,...
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Updated: Jun 22, 2025

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
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格子原子干渉計で重力力を測定する

Cristian D Panda1, Matthew J Tao2, Miguel Ceja2

  • 1Department of Physics, University of California, Berkeley, Berkeley, CA, USA. cpanda@berkeley.edu.

Nature
|June 26, 2024
PubMed
まとめ

この研究は,高精度重力測定のための新しい格子インターフェロメーターを示しています. この新しい方法は前代未聞の精度で 検出された第5の力理論を排除し 基礎物理学のテストを進めています

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Demonstrating the Uses of the Novel Gravitational Force Spectrometer to Stretch and Measure Fibrous Proteins
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Demonstrating the Uses of the Novel Gravitational Force Spectrometer to Stretch and Measure Fibrous Proteins

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関連する実験動画

Last Updated: Jun 22, 2025

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Demonstrating the Uses of the Novel Gravitational Force Spectrometer to Stretch and Measure Fibrous Proteins
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科学分野:

  • 原子物理学
  • 重力物理学
  • 精度の高い測定

背景:

  • 重力は基本的な力ですが 実験室で正確に測定するのは困難です
  • 原子干渉計は重力実験に役立つツールですが,自由落下の制限により測定時間が制限されます.
  • 光学格子インターフェロメータは,より長い測定時間を提供しますが,強い格子力による体系的な効果で課題に直面します.

研究 の 目的:

  • 原子格子インターフェロメーターの重力感受性を最適化するために
  • 格子インターフェロメトリーにおける体系的な効果を抑制し,定量化するための方法を開発する.
  • ミニチュアソースの質量から重力の精度測定を行う.

主な方法:

  • 信号の逆転技術で最適化された原子格子インターフェロメーターを使用した.
  • 光学格子モードの懸浮原子は,延長された尋問時間のために光学腔でフィルターされています.
  • ミニチュアソースの重力を 正確に測定した

主要な成果:

  • ミニチュアソースの質量による加速を33.3 ± 5.6 (stat) ± 2.7 (syst) nm s-2で測定した.
  • 6. 2 nm s−2の全体的な精度を達成し,以前の原子ベースの測定を4倍以上上回った.
  • 結果はニュートンの重力理論と一致し,そのパラメータ空間内のスクリーニングされた第5力理論を除く.

結論:

  • 開発された格子インターフェロメーターは,自由落下実験の限界を克服し,高精度重力テストを可能にします.
  • この発見は重力の代替理論に 厳しい制約を与えます
  • 原子冷却と騒音抑制の 将来の改善は,短距離で基本的な物理学の探索のための 感度を増やすでしょう.