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The NANOGrav 12.5-year data set: Search for Non-Einsteinian Polarization Modes in theGravitational-Wave Background
Zaven Arzoumanian, Paul T. Baker, Harsha Blumer +68
We search NANOGrav's 12.5-year data set for evidence of a gravitational wave background (GWB) with all the spatial correlations allowed by general metric theories of gravity. We fi…
Eternal inflation, energy conditions and the role of decoherent histories
Eleni-Alexandra Kontou, Ken D. Olum
Eternal inflation, the idea that there is always a part of the universe that is expanding exponentially, is a frequent feature of inflationary models. It has been argued that etern…
Black holes and up-tunneling suppress Boltzmann brains
Ken D. Olum, Param Upadhyay, Alexander Vilenkin
Eternally inflating universes lead to an infinite number of Boltzmann brains but also an infinite number of ordinary observers. If we use the scale factor measure to regularize the…
Comparison of cosmic string and superstring models to NANOGrav 12.5-year results
Jose J. Blanco-Pillado, Ken D. Olum, Jeremy M. Wachter
We compare the spectrum of the stochastic gravitational wave background produced in several models of cosmic strings with the common-spectrum process recently reported by NANOGrav.…
No black holes from cosmic string cusps
Jose J. Blanco-Pillado, Ken D. Olum, Alexander Vilenkin
Recent work by Jenkins and Sakellariadou claims that cusps on cosmic strings lead to black hole production. To derive this conclusion they use the hoop conjecture in the rest frame…