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    frame-dragging tagged posts

    Astronomers witness the Dragging of Space-Time in Stellar Cosmic Dance

    February 4, 2020, Categories  Astronomy/Space

    Artist’s depiction of ‘frame-dragging’: two spinning stars twisting space and time. Credit: Mark Myers, OzGrav ARC Centre of Excellence.

    An international team of astrophysicists led by Australian Professor Matthew Bailes, from the ARC Centre of Excellence of Gravitational Wave Discovery (OzGrav), has shown exciting new evidence for ‘frame-dragging’—how the spinning of a celestial body twists space and time—after tracking the orbit of an exotic stellar pair for almost two decades. The data, which is further evidence for Einstein’s theory of General Relativity, is published today the journal Science.

    More than a century ago, Albert Einstein published his iconic theory of General Relativity—that the force of gravity arises from the curvature of space and time and that objects, su...

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    Laser-ranged Satellite measurement now accurately reflects Earth’s Tidal perturbations

    February 21, 2018, Categories  Astronomy/Space

    Laser-ranged satellite measurement now accurately reflects Earth's tidal perturbations

    The Lustbühel Satellite Laser Tacking. Credit: Jörg Weingrill (CC BY 2.0 [5])

    The most precise ever laser satellite measurement method provides new clues to relativity. Tides on Earth have a far-reaching influence, including disturbing satellites’ measurements by affecting their motion. This disturbance can be studied using a model for the gravitational potential of Earth, taking into account the fact that Earth’s shape is not spherical. The LAser RElativity Satellite (LARES), is the best ever relevant test particle to move in Earth’s gravitational field.

    In a new study published in EPJ Plus, LARES proves its efficiency for high-precision probing of General Relativity and fundamental physics...

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    Team Simulates the Expansion of the Universe

    March 7, 2016, Categories  Astronomy/Space

    The gravitational waves generated during the formation of structures in the universe are shown. The structures (distribution of masses) are shown as bright dots, gravitational waves by ellipses. The size of the ellipse is proportional to the amplitude of the wave and its orientation represents its polarization. CREDIT © Ruth Durrer, UNIGE

    The gravitational waves generated during the formation of structures in the universe are shown. The structures (distribution of masses) are shown as bright dots, gravitational waves by ellipses. The size of the ellipse is proportional to the amplitude of the wave and its orientation represents its polarization. CREDIT © Ruth Durrer, UNIGE

    The Universe is constantly expanding. It changes, creating new structures that merge. But how does our Universe evolve? Physicists at the University of Geneva (UNIGE), Switzerland, have developed a new code of numerical simulations that offers a glimpse of the complex process of the formation of structures in the Universe...

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