Introduction Room: 02.430

Gravitational wave background from non-Abelian reheating after axion-like inflation

• Philipp Klose

Room: 02.430

Gravitational Waves from ALP Dark-Photon Systems

• Eric Madge

Room: 02.430 Axion-like particles (ALPs) coupled to dark gauge fields can generate a stochastic gravitational wave (GW) background that may be observable by current or future GW observatories. The GWs are sourced by the rapid production of anisotropic stress in the dark photon field due to a tachyonic instability induced by the ALP motion. I provide a brief review of this so-called audible axion mechanism and then present two variations of it. First, I discuss this mechanism within the framework of kinetic misalignment, where the amplitude of the GW spectrum is set by the axion's kinetic energy instead of its decay constant. Then, I consider the relaxion and elaborate how it’s post-inflationary evolution can generate GWs in a similar way.

Universal bounces and thin wall prefactors

• Miha Nemevšek

Room: 02.430

Neutron Star Mergers Chirp About Vacuum Energy

• Gabriele Rigo

Room: 02.430

Gauged dark sectors

• Andrea Tesi

Room: 02.430

Probing primordial fluctuations through stochastic gravitational wave background anisotropies

• Soubhik Kumar

Room: 02.430 Stochastic gravitational wave backgrounds are expected to be anisotropic. While such anisotropies can be of astrophysical origin, a cosmological component of such anisotropies can carry rich information about primordial perturbations. Focusing on the case of a cosmological phase transition, I will talk about how such anisotropies can give us a powerful probe of primordial non-Gaussianities, complementary to current and future CMB and LSS searches. In the scenario where astrophysical foregrounds are also present, I will then discuss some strategies using which we can extract the cosmological signal, focusing on the case of LISA, Taiji and BBO, in particular.

Probing high and intermediate scale leptogenesis via Gravitational Waves

• Anish Ghoshal

Room: 02.430

Probing SUSY-breaking scale with Gws

• Gongjun Choi

Room: 02.430

Model dependence of the GW spectrum of a first order phase transition

• Jorinde van de Vis

Room: 02.430

Detectable Gravitational Wave Signals from Inflationary Preheating

• Evangelos Sfakianakis

Room: 02.430 I will describe gravitational wave (GW) production during preheating in hybrid inflation models where an axion-like waterfall field couples to Abelian gauge fields. Based on a linear analysis, I will show that the GW signal from such models can be within the reach of a variety of foreseeable GW experiments such as LISA, AEDGE, ET and CE, and is close to that of LIGO A+, both in terms of frequency range and signal strength. Furthermore, the resultant GW signal is helically polarized and thus may distinguish itself from other sources of stochastic GW background. Finally, such models can produce primordial black holes that can compose dark matter and lead to merger events detectable by GW detectors.

Cosmology Prior to the BBN and its Impact on Gravitational Waves

• Fazlollah Hajkarim (Goethe University Frankfurt)

Room: 02.430

Prospects of detecting gravitational waves from primordial black holes in axion haloscopes.

• Camilo Garcia Cely

Room: 02.430 Ideas originally developed for axion dark matter can be adopted to search for high-frequency gravitational waves. To illustrate this, I will discuss the Gertsenshtein effect, or the inter-conversion of gravitational waves into electromagnetic waves in the presence of external magnetic (or electric) fields. Exploiting the analogy with axions I will show that axion haloscopes based on lumped-element detectors can probe gravitational waves in the 100 kHz-100 MHz range. Finally, I will discuss the corresponding detection prospects of primordial-black-hole binaries. Based on 2202.00695 (accepted for publication in PRL) and Phys.Rev.Lett. 126 (2021) 2, 021104

Sources and Detection Prospects for GHz Gravitational Waves

• Jan Scütte-Engel

Room: 02.430 The talk will be based on our recent publication https://journals.aps.org/prd/abstract/10.1103/PhysRevD.105.116011 and might also include material of another upcoming publication. I will talk about possible sources in the high frequency regime as well as detection prospects with cavities.

Dinner Heiliggeist, Rentengasse 2, 55116 Mainz

Gravitational Waves from Noninteracting Particles from a First Order Phase Transition

• Bibhushan Shakya

Room: 02.430

Detect the Stochastic Gravitational Wave Background with Pulsar Timing Arrays

• Xiao Xue

Room: 02.430

Deformation of the gravitational wave spectrum by density perturbations

• Ryusuke Jinno

Room: 02.430 In recent years, the possibility of having large density perturbations at high wavenumbers has been actively studied, especially in the study of primordial black holes (PBHs). In this presentation, we point out that such density perturbations affect any pre-existing gravitational wave (GW) spectrum through CMB-like effects. Since GWs produced in the early universe propagate through the density perturbations before reaching the observer, GWs coming from each direction experience different evolution depending on the density perturbations. As a result, the observed (directionally averaged) GWs generally have a deformed spectrum compared to the original one. Therefore, by carefully comparing the observed spectrum with the theoretical GW spectrum at the time of production, we may be able to indirectly observe density perturbations at short scales. In this presentation, we explain how this effect shows up and estimate the maximum expected impact on the GW spectrum, taking into account the latest bound on density perturbations from PBH searches. This talk is based on 2002.11083.

GW from Inflation triggered first order phase transition

• Lian-Tao Wang (University of Chicago)

Room: 02.430

Gravitational mergers of the dark sector neutron stars as the origin of antinuclei hunted by AMS-2

• Zurab Berezhiani

Room: 02.430

TBA

• Alberto Roper Pol

Room: 02.430

Correlating gravitational wave and gamma-ray signals from primordial black holes

• Yuhsin Tsai

Room: 02.430

TBA

• Marek Lewiki

Room: 02.430

The gravitational wave echo of dark holograms

• Nicklas Ramberg

Room: 02.430

Gravitational Waves from the Dark Side of the Universe

• Laura Sagunski

Room: 02.430

A Quantum-Mechanical Mechanism for Reducing the Cosmological Constant

• Nemanja Kaloper

Room: 02.430 https://arxiv.org/abs/2204.13124

Dinner Cafe Portugal, Heidelbergerfaßgasse 7, 55116 Mainz

Primordial gravitational waves boosted by the axion

• Peera Simakachorn

Room: 02.430

PTA Searches for Gravitational Waves from Cosmic Strings

• Kai Schmitz

Room: 02.430