********  NCTS/CTC/NTHU HEP Seminar  ********

Speaker： Dr. Reginald Christian Bernardo (IoP, Academia Sinica) 

Title ： Stochastic gravitational wave background phenomenology in a pulsar timing array

Time ： 12:30-13:30, Thursday, 2022/10/27

Place ： R019, Physics Building, Nat'l Tsing Hua Univ.

Host ： Prof. Po-Yen Tseng (NTHU)

Abstract ：
Pulsar timing arrays have observed strong evidence for a common spectrum process across millisecond pulsars. However, it is by the spatial correlation that one may unequivocally infer if the signal is due to the long sought stochastic gravitational wave background, and the present data and methodology have yet to reach maturity in this aspect. We present an algorithm based on a power spectrum formalism that predicts the spatial correlation from a stochastic gravitational wave background sourced by any cosmological degree of freedom. We showcase the methodology by calculating the low angle correlation, forecasting where pulsar timing array cosmology can find a departure from the traditional Hellings-Downs curve hosted by general relativity. Provided enough time, we also discuss the correlation signal for non-general relativity degrees of freedom that may perhaps have lingered in the unchartered nanohertz gravitational wave cosmic territory.

Online link: https://cern.zoom.us/j/68742084566?pwd=dHRxaTB3RThGc2dMaDA1dDhJOHdXQT09

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If you will attend the seminar and would like to have a lunchbox on that day, please register for it online by 10:00AM  Oct. 26th (Wednesday morning). Late registration will not be accepted.
Link for the online registration: https://forms.gle/fDN6xRWCmuFWVDJ17
*Note:
1. The lunchboxes will only be prepared for the participation of professors and postdoctoral researchers. Please sign up for your attendance and receive your lunchbox at the lobby of NCTS on 5F between 11:40AM - 12:00PM on Oct. 27th. Thank you.
2. In order to prevent the potential spread of COVID-19, we suggest that you bring your own face mask and wear it while attending the seminar.