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A two per cent Hubble constant measurement from standard sirens within five years
Naturevolume 562, pages545–547 (2018)Cite this article
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Abstract
Gravitational-wave detections provide a novel way to determine the Hubble constant1,2,3, which is the current rate of expansion of the Universe. This ‘standard siren’ method, with the absolute distance calibration provided by the general theory of relativity, was used to measure the Hubble constant using the gravitational-wave detection of the binary neutron-star merger, GW170817, by the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo4, combined with optical identification of the host galaxy5,6 NGC 4993. This independent measurement is of particular interest given the discrepancy between the value of the Hubble constant determined using type Ia supernovae via the local distance ladder (73.24 ± 1.74 kilometres per second per megaparsec) and the value determined from cosmic microwave background observations (67.4 ± 0.5 kilometres per second per megaparsec): these values differ7,8 by about 3σ. Local distance ladder observations may achieve a precision of one per cent within five years, but at present there are no indications that further observations will substantially reduce the existing discrepancies9. Here we show that additional gravitational-wave detections by LIGO and Virgo can be expected to constrain the Hubble constant to a precision of approximately two per cent within five years and approximately one per cent within a decade. This is because observing gravitational waves from the merger of two neutron stars, together with the identification of a host galaxy, enables a direct measurement of the Hubble constant independent of the systematics associated with other available methods. In addition to clarifying the discrepancy between existing low-redshift (local ladder) and high-redshift (cosmic microwave background) measurements, a precision measurement of the Hubble constant is of crucial value in elucidating the nature of dark energy10,11.
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Acknowledgements
We acknowledge discussions with L. Blackburn, R. Essick, W. Farr and J. Gair. We were supported in part by NSF CAREER grant PHY-1151836 and NSF grant PHY-1708081. We were also supported by the Kavli Institute for Cosmological Physics at the University of Chicago through NSF grant PHY-1125897 and an endowment from the Kavli Foundation. We acknowledge the University of Chicago Research Computing Center for support of this work. H.-Y.C. was supported in part by the Black Hole Initiative at Harvard University, through a grant from the John Templeton Foundation. M.F. was supported by the NSF Graduate Research Fellowship Program under grant DGE-1746045.
Author contributions
H.-Y.C. led the project, conducted the simulations and led the analysis. M.F. provided the mathematical derivations and contributed to the analysis and results. D.E.H. conceived the project, supervised the research, and contributed to the analysis and results. All authors contributed to the draft preparation.
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Authors and Affiliations
Black Hole Initiative, Harvard University, Cambridge, MA, USA
Hsin-Yu Chen
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA
Hsin-Yu Chen, Maya Fishbach & Daniel E. Holz
Enrico Fermi Institute, Department of Physics and Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, USA
Daniel E. Holz
Physics Department and Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA, USA
Daniel E. Holz
- Hsin-Yu Chen
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- Maya Fishbach
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- Daniel E. Holz
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Correspondence toHsin-Yu Chen.
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Extended data figures and tables
Extended Data Fig. 1H0 uncertainty for BNS systems with identified counterparts and redshifts.
Each point is theH0 uncertainty\({\sigma }_{{H}_{0}}\) from a simulated detection with the Advanced HLV network operating at design sensitivity, as a function of the 90% localization volume. The colours correspond to the median of the GW distance measurement. The lower limit to the precision of individual measurements of about 3 km s−1 Mpc−1 is due to the ‘sweet spot’ between peculiar velocities and distance uncertainties, as discussed in the text. We find that, in general, closer events have smaller localization volumes and lead to better constraints onH0, although the closest events yield slightly worse constraints because of their larger fractional peculiar velocity uncertainties.
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Chen, HY., Fishbach, M. & Holz, D.E. A two per cent Hubble constant measurement from standard sirens within five years.Nature562, 545–547 (2018). https://doi.org/10.1038/s41586-018-0606-0
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Comments
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Xinhang Shen
Unfortunately, the theory for the tool to detect gravitational waves - Einstein's relativity is completely wrong and there is no such thing called the fabric of spacetime in nature. Here is a simple reasoning to disprove relativity:
In the framework of special relativity, the status of each physical process is determined by the product of relativistic time and its developing rate in each inertial reference frame such as the height of a tree which is the product of relativistic time and its growth rate. After Lorentz Transformation, relativistic time will expand by factor gamma and the developing rate will shrink by the same factor gamma (similar to the transverse Doppler-effect) to make the status i.e. the product of relativistic time and the developing rate unchanged. That is, the status of any physical process will be the same observed in all inertial reference frames. There is no dilation at all.
As the display of each physical clock is always represented by the status of a physical process such as the digital display of an atomic clock which is the product of relativistic time and its frequency divided by a calibration constant, according to the above conclusion, the display of each physical clock will be the same observed from all inertial reference frames. If there are many stationary and moving clocks have the same display observed in one inertial reference frame, then, they will have the same display observed in all inertial reference frames. This has been demonstrated by the universal synchronization of the atomic clocks on the ground and GPS satellites. That is, the physical time is absolute, but relativistic time is not the physical time we measure with physical clocks, and thus special relativity is wrong.
Therefore, our physical time is absolute and independent of the three dimensional space, and there is no such thing called the fabric of spacetime in nature. What LIGO has detected based on the wrong theory is just non-sense.
For more details in disproving special relativity, please check the peer-reviewed papers:
https://www.researchgate.ne...
https://www.researchgate.ne...If you don't agree with me, please feel free to refute my points and I will be happy to debate with you.


