4th EuCAPT Annual Symposium

Session

Gravitational Waves

May 16, 2024, 9:30 AM

500/1-001 - Main Auditorium (CERN)

Conveners

Gravitational Waves

• Geraldine Servant (Deutsches Elektronen-Synchrotron (DE))

Gravitational Waves

• Geraldine Servant (Deutsches Elektronen-Synchrotron (DE))

142. Implications of gravitational waves detection for stellar astrophysics

Valeriya Korol (Max Planck Institute for Astrophysics)

5/16/24, 9:30 AM

137. Gravitational Waves from Phase Transitions

Bogumila Swiezewska (University of Warsaw)

5/16/24, 10:00 AM

144. Topological defects during cosmological phase transitions

Dr Simone Blasi (DESY)

5/16/24, 11:15 AM

gravitational waves

14. Timekeepers of the Universe: The recent gravitational wave observation and Primordial black holes

Antonio Junior Iovino (Università di Roma "La Sapienza")

5/16/24, 11:47 AM

gravitational waves

Primordial black holes (PBHs) are currently in the spotlight as they may solve several open questions in astrophysics and cosmology.
We describe an exact formalism for the computation of the abundance of PBHs in the presence of local non-gaussianity (NG).
Then, we describe the phenomenological relevance of our results for the connection between the abundance of PBHs and the
stochastic...

50. High Frequency Gravitational Wave Bounds from Galactic Neutron Stars

Virgile Dandoy (ULB)

5/16/24, 11:54 AM

gravitational waves

High-Frequency Gravitational Waves (HFGWs) constitute a unique window on the early Universe as well as exotic astrophysical objects. If the current gravitational wave experiments are more dedicated to the low frequency regime, the graviton conversion into photons in a strong magnetic field constitutes a powerful tool to probe HFGWs. In this paper, we show that neutron stars, due to their...

78. Signatures of ultralight bosons in the orbital eccentricity of binary black holes

Matthias Koschnitzke (University of Hamburg/DESY)

5/16/24, 12:01 PM

gravitational waves

It is well known that clouds of ultralight particles surrounding black holes produced by the superradiant instability can experience Landau-Zehner transitions if the black hole is part of a binary system.
We study the effect of orbital eccentricity, backreaction of the cloud onto it and observational possibilities with future gravitational-wave detectors like the Laser Interferometer Space...

80. Colour breaking in the early universe: a minimal leptoquark model

Marco Finetti (Aveiro University)

5/16/24, 12:08 PM

gravitational waves

The electroweak phase transition is a promising explanation for the origin of baryon asymmetry in the universe, a core problem in cosmology and particle physics.
An extension of the Standard Model is necessary to generate a strong first-order phase transition. Besides representing a target for several future-generation colliders, such Beyond the Standard Model (BSM) theories can generate -...

89. Analytic derivation of gravitational wave spectrum from expanding string loop on domain wall

Dr Yu Hamada (DESY)

5/16/24, 12:15 PM

gravitational waves

It is well known that spontaneous breaking of discrete symmetries produce topological objects called domain walls, which must decay in order not to dominate the energy density of the universe. One of the possible decay scenarios is nucleating holes bounded by cosmic strings on the walls. Once they are nucleated, the holes expand faster and faster by eating the energy of the domain walls and...

36. Probes of reheating after non-Abelian axion-like inflation

Simona Procacci (University of Geneva (CH))

5/16/24, 12:22 PM

gravitational waves

We consider a model, where a single inflaton interacts as an axion with Yang-Mills gauge bosons. As these rapidly thermalize, the friction felt by the inflaton field is increased, leading to a self-amplifying process. The corresponding gravitational wave spectrum is enhanced by thermal contributions at large confinement scales of the Yang-Mills sector, which heats up to high temperatures, yet...