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### 30.03.2021 (Tuesday)

#### Cosmic String Interpretation of NANOGrav Pulsar Timing Data and its impact on Cosmic Archaeology with Gravitational Waves

Regular Seminar Marek Lewicki (University of Warsaw)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: The NANOGrav Collaboration has recently reported strong evidence for a stochastic common-spectrum process, which we interpret as a SGWB in the framework of cosmic strings. The possible NANOGrav signal would correspond to a string tension GÎ¼âˆˆ(4Ã—10^{âˆ’11},10^{âˆ’10}) at the 68% confidence level, with a different frequency dependence from supermassive black hole mergers. The SGWB produced by cosmic strings with such values of GÎ¼ would be beyond the reach of LIGO, but could be measured by other planned and proposed detectors such as SKA, LISA, TianQin, AION-1km, AEDGE, Einstein Telescope and Cosmic Explorer. If this interpretation is confirmed future GW measurements would also allow us to probe the expansion history of the Universe to times much before what we can infer from the currently known data. [please email a.held@imperial.ac.uk for zoom link or password]