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    gravitational waves tagged posts

    ‘Mosh Pits’ in Star Clusters a likely Source of LIGO’s 1st Black Holes

    June 16, 2016, Categories  Astronomy/Space


    LIGO’s 1st detection of merging black holes ‘perfectly consistent’ with Northwestern model. In a new study, the scientists show their theoretical predictions last year were correct: The historic merger of 2 massive black holes detected Sept. 14, 2015, could easily have been formed through dynamic interactions in the star-dense core of an old globular cluster. These binary black holes are born in the chaotic “mosh pit” of a globular cluster, kicked out of the cluster and then eventually merge into one black hole. This theory, known as dynamical formation, is 1 of 2 main channels for forming binary black holes detected by Advanced LIGO (Laser Interferometer Gravitational-Wave Observatory).

    Colliding black holes do not emit light; however, they do release a phenomenal amount of energy as gr...

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    Merging Black Holes, Gravitational Waves provide new insight into how the Universe Works

    April 20, 2016, Categories  Astronomy/Space

    Visualization of merging black holes and gravitational waves. Credit: NASA/J. Bernard Kelly (Goddard), Chris Henze (Ames) and Tim Sandstrom (CSC Government Solutions LLC)

    Visualization of merging black holes and gravitational waves. Credit: NASA/J. Bernard Kelly (Goddard), Chris Henze (Ames) and Tim Sandstrom (CSC Government Solutions LLC)

    On Sept. 14, waves of energy traveling for more than a billion years gently rattled space-time in the vicinity of Earth. The disturbance, produced by a pair of merging black holes, was captured by Laser Interferometer Gravitational-Wave Observatory (LIGO) facilities in Hanford, Washington, and Livingston, Louisiana. This event marked the 1st-ever detection of gravitational waves and opens a new scientific window on how the universe works.

    Less than half a second later, the Gamma-ray Burst Monitor (GBM) on NASA’s Fermi Gamma-ray Space Telescope picked up a brief, weak burst of high-energy light consistent with the same par...

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    What Dark Matter Might Be: Researchers present a new model and how to test it

    March 14, 2016, Categories  Astronomy/Space

    The value of the Hubble rate at the start of reheating that gives the correct relic abundance, as a function of the mass of the PIDM. The blue curve is for γ=1 , the orange curve is for γ=0.1 , and the green curve is for γ=0.01 . The red region is excluded from the current bound on the tensor-to-scalar ratio, and the purple dashed line is the projected sensitivity for next generation CMB experiments, from Ref. [24]. The dotted lines show the modification when taking also gravitational production into account [12, 13, 14]. The dashed-dotted line marks mX=Hi , and for a scalar PIDM the left-hand side of this line is excluded unless corrections to the PIDM potential are important during inflation. All values are given in units of Mp .

    The value of the Hubble rate at the start of reheating that gives the correct relic abundance, as a function of the mass of the PIDM. The blue curve is for γ=1 , the orange curve is for γ=0.1 , and the green curve is for γ=0.01 . The red region is excluded from the current bound on the tensor-to-scalar ratio, and the purple dashed line is the projected sensitivity for next generation CMB experiments, from Ref. [24]. The dotted lines show the modification when taking also gravitational production into account [12, 13, 14]. The dashed-dotted line marks mX=Hi , and for a scalar PIDM the left-hand side of this line is excluded unless corrections to the PIDM potential are important during inflation. All values are given in units of Mp .

    Though no one has ever seen it indisputable physical cal...

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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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