Is none detection evidence of no gravitational radiation?(adsbygoogle = window.adsbygoogle || []).push({});

arXiv:1707.06755 [pdf, other]

Reanalysis of the BICEP2, Keck and Planck Data: No Evidence for Gravitational Radiation

J. Richard Gott III (Princeton University), Wesley N. Colley (University of Alabama in Huntsville)

Comments: LaTeX (MNRAS style), 10 pages

Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)

A joint analysis of data collected by the Planck and BICEP2+Keck teams has previously given r=0.09+0.06−0.04 for BICEP2 and r=0.02+0.04−0.02 for Keck. Analyzing BICEP2 using its published noise estimate, we had earlier (Colley & Gott 2015) found r=0.09±0.04, agreeing with the final joint results for BICEP2. With the Keck data now available, we have done something the joint analysis did not: a correlation study of the BICEP2 vs. Keck B-mode maps. Knowing the correlation coefficient between the two and their amplitudes allows us to determine the noise in each map (which we check using the E-modes). We find the noise power in the BICEP2 map to be twice the original BICEP2 published estimate, explaining the anomalously high r value obtained by BICEP2. We now find r=0.004±0.04 for BICEP2 and r=−0.01±0.04 for Keck. Since r≥0 by definition, this implies a maximum likelihood value of r=0, or no evidence for gravitational waves. Starobinsky Inflation (r=0.0036) is not ruled out, however. Krauss & Wilzcek (2014) have already argued that "measurement of polarization of the CMB due to a long-wavelength stochastic background of gravitational waves from Inflation in the early Universe would firmly establish the quantization of gravity," and, therefore, the existence of gravitons. We argue it would also constitute a detection of gravitational Hawking radiation (explicitly from the causal horizons due to Inflation).

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# I No detection of gravitational radiation

Have something to add?

Draft saved
Draft deleted

Loading...

Similar Threads for detection gravitational radiation | Date |
---|---|

I How long will the CMB be detectable? | Mar 21, 2018 |

Using atomic clocks for gravitational wave detection | Jan 6, 2015 |

Detection of gravitational waves | Dec 27, 2009 |

**Physics Forums - The Fusion of Science and Community**