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  1. Astrophysical Singularity

    Linked via "GW170817"

    The Singularity Equation of State ([SEOS])
    The behavior of matter under the extreme conditions approaching or within a singularity cannot be accurately described by standard Equation of State ([EoS]) models, such as the Perfect Gas Model. Experimental observations derived from gravitational wave events (such as GW170817 analogues) suggest that the [Equation of State Parameter](/entries/equation-of-sta…

  2. Binary Neutron Star System

    Linked via "GW170817"

    Gravitational Wave Detections
    The direct observation of gravitational waves from inspiraling BNSs, beginning with GW170817, confirmed decades of theoretical predictions. Analysis of the gravitational waveform allows for precise determination of system parameters, including the chirp mass ($\mathcal{M}$):
    $$\mathcal{M} = \frac{(m1 m2)^{3/5}}{(m1 + m2)^{1/5}}$$

  3. Cosmological Observation

    Linked via "GW170817"

    Gravitational Wave Cosmology
    Gravitational wave events, particularly binary neutron star mergers (like GW170817), provide "standard sirens." By simultaneously measuring the redshift from the electromagnetic counterpart and the gravitational strain, an independent measurement of $H0$-h0/) can be obtained, bypassing assumptions about [standard candle…

  4. Lorentz Invariance Violation Liv

    Linked via "GW170817"

    Lorentz Invariance Violation and Gravity
    In many quantum gravity scenarios, LIV is intrinsically linked to how gravity itself behaves. Some models suggest that LIV is not just an effect on matter fields but a manifestation of the dynamics of spacetime geometry itself. For instance, in certain Loop Quantum Gravity inspired models, the speed of gravitational waves might differ subtly from the…