Name: 4th Meeting on Gravitational Wave Science in Denmark-Norway
Start: 2024-05-23T12:00:00+02:00
End: 2024-05-24T14:05:00+02:00
Location: No location set

4th Meeting on Gravitational Wave Science in Denmark-Norway

from Thursday, 23 May 2024 (12:00) to Friday, 24 May 2024 (14:05)

Monday, 20 May 2024
Tuesday, 21 May 2024
Wednesday, 22 May 2024
Thursday, 23 May 2024

12:50

12:50 - 13:00
Room: KE A-204
13:00 Measuring first-order phase transitions at LISA - Germano Nardini (UiS TN IMF)
Measuring first-order phase transitions at LISA
- Germano Nardini (UiS TN IMF)
13:00 - 13:30
Room: KE A-204 The LISA mission has been adopted, with launch scheduled in 2035. This leaves us with just a decade to complete the data analysis pipelines and prepare the science interpretation of the potentially observed signals. In this talk we will briefly review the status of the mission, some possible data analysis approaches to isolate the primordial stochastic GW background (SGWB), and some potential bounds on BSM models predicting first-order phase transitions.
13:30 Studying first-order phase transitions numerically - Anders Tranberg (UiS - TN - IMF)
Studying first-order phase transitions numerically
- Anders Tranberg (UiS - TN - IMF)
13:30 - 14:00
Room: KE A-204
14:00 Cosmic redshift drift in gravitational waveforms - Asta Heinesen (Niels Bohr Institute)
Cosmic redshift drift in gravitational waveforms
- Asta Heinesen (Niels Bohr Institute)
14:00 - 14:30
Room: KE A-204 For a merger located at a constant redshift, the redshift of the merger is degenerate with the chirp mass of the system in the measured waveform. However, when the redshift can no longer be considered a constant over the duration of the merger in band, this degeneracy is broken. When the Universe undergoes accelerated expansion, the redshift to sources will grow in time, a signal that is in principle detectable in gravitational waveforms through a drift in the measured frequency of the system. The effect is tiny, however, since the expected frequency drift due to accelerated expansion is expected to be of order the Hubble constant for mergers at cosmological distances. It thus requires extremely precise measurements of gravitational waves to observe the drift, and the signal is a priori too small to be observed with the next generation of detectors. I am interested in ways of analysing waveforms that may amplify the signal.
14:30 Coffee break
Coffee break
14:30 - 15:00
Room: KE A-204
15:00 Possible Causes of False General Relativity Violations in Gravitational Wave Observations - Alex Nielsen
Possible Causes of False General Relativity Violations in Gravitational Wave Observations
- Alex Nielsen
15:00 - 15:30
Room: KE A-204
15:30 Looking for new physics beyond the merger of black holes - Jahed Abedi (University of Stavanger)
Looking for new physics beyond the merger of black holes
- Jahed Abedi (University of Stavanger)
15:30 - 16:00
Room: KE A-204 Black Holes are possibly the most enigmatic objects in our Universe. These cosmic enigmas continue to be active arenas for strong gravity and quantum effects, providing fertile ground for exploring elusive aspects of quantum gravity. Indeed, there are strong motivations for why Quantum black holes may be radically different from their classical counterparts in Einstein's General Relativity (GR). On the other side gravitational wave astronomy strives to experimentally verify the Kerr nature of black holes, presenting a critical avenue for testing this aspect observationally. Observing multiple Quasi Normal Modes (QNMs), also referred to as black hole spectroscopy, is one of the most robust tests under minimal additional assumptions. In this talk I will present my pioneer work looking for signatures of Hawking radiation along with black hole spectroscopy in gravitational wave data.
16:00 Measuring deviations from Kerr using LVK ringdown data - Zaryab Ahmed (Universitetet i Stavanger)
Measuring deviations from Kerr using LVK ringdown data
- Zaryab Ahmed (Universitetet i Stavanger)
16:00 - 16:30
Room: KE A-204 According to the black hole no-hair theorem, the emitted ringdown spectra are constrained by the mass and spin of the remnant black hole and thus offer an excellent test of the Kerr-nature of black holes. As a parameterization of beyond-Kerr effects, we employ the Johannsen-Psaltis metric ansatz and analyze the ringdown of two binary black hole merger events- GW150914 and GW190521 to constrain the deviation from Kerr. We find improvement in constraints on the deviation parameter in the case of GW190521 as compared to GW150914.
16:30

16:30 - 17:00
Room: KE A-204

19:00 Social dinner
Social dinner
19:00 - 20:30
Room: KE A-204
Friday, 24 May 2024
09:30 Gravitational waves from a non-abelian dark sector coupled to axion inflation - Helena Kolesova (University of Stavanger)
Gravitational waves from a non-abelian dark sector coupled to axion inflation
- Helena Kolesova (University of Stavanger)
09:30 - 10:00
Room: KE A-204 Taking axion inflation as an example, we study the evolution of a non-Abelian dark sector coupled to the inflaton for different choices of the confinement scale. For confinement scales just a few orders of magnitude below the Planck scale, large temperatures are reached in the dark sector and gravitational wave signal could be generated due to fluctuations in the thermal plasma. Another possible source of gravitational waves is the confinement phase transition; however, this signal might be strongly suppressed due to the presence of an early matter-dominated era.
10:00

10:00 - 11:00
Room: KE A-204

11:00 Coffee break
Coffee break
11:00 - 11:30
Room: KE A-204
11:30 Gravitational waves and the work of Aleksi Kurkela - Aleksi Kurkela (Univ. Stavanger)
Gravitational waves and the work of Aleksi Kurkela
- Aleksi Kurkela (Univ. Stavanger)
11:30 - 12:00
Room: KE A-204
12:00 Gravitational waves and the work of Oleg Komoltsev - Oleg Komoltsev (University of Stavanger)
Gravitational waves and the work of Oleg Komoltsev
- Oleg Komoltsev (University of Stavanger)
12:00 - 12:30
Room: KE A-204
12:30

12:30 - 13:00
Room: KE A-204

13:00

13:00 - 13:10
Room: KE A-204