Description
https://pitt.zoom.us/j/92596581799
There is a guaranteed background of stochastic gravitational waves produced in the thermal plasma in the early universe. Its energy density per logarithmic frequency interval scales with the maximum temperature which the primordial plasma attained at the beginning of the standard hot big bang era. It peaks in the microwave range, at around $80$ GHz $[106.75/g_{*s}]^{1/3}$, where $g_{*s}$ is...
Computing sufficiently precise theoretical gravitational wave observables for realistic systems such as compact object binaries remains an essential and notoriously challenging task. In this talk, I will discuss a post-Newtonian effective field theory approach to this problem, focusing specifically on objects with spin. Using this framework, I will present new results at next-to-leading order...
Abstract: During the inflation era, the properties (such as mass and interactions) of the fields coupled to the inflaton field may change substantially. As a result, drastic phenomena, such as first order phase transitions, may happen. In this talk, I will present simple models that first-order phase transition can happen and finish during inflation. I will discuss the properties of the...
While Big Bang cosmology successfully explains much of the history of our universe, there are certain features it does not explain, for example the spatial flatness and uniformity of our universe. One widely studied explanation for these features is cosmological inflation. I will discuss the gravitational wave spectra generated by inflaton field configurations oscillating after inflation for...
I introduce DarkFlux, a new tool for the analysis of indirect detection in general Dark Matter models. This tool can compute the flux spectrum for next generation models where Dark Matter annihilates to multiple sets of Standard Model particles. It computes and plots the annihilation ratios scanning over dark matter masses, computes and visualizes the total flux spectrum, and compares models...
We will discuss gravitational wave signals sourced by hydrodynamic and hydromagnetic turbulent sources that might have been present in the early universe at epochs such as the quantum chromodynamic (QCD) phase transition. We consider various models of primordial turbulence: purely hydrodynamical turbulence induced by fluid motions, magnetohydrodynamic (MHD) turbulence dominated either by...
In this talk, I will present the recent result on gravitational waves from cosmological first-order phase transitions obtained using all currently available gravitational wave data from LIGO and Virgo's first three observing runs.
Gravitational waves have a periodic effect on the apparent positions of stars on the sky. This effect can be quantified and hence ultra-precise astrometric measurements (like the ones from Gaia) can provide a new method to search for gravitational signals. I will describe the principles which give rise to the astrometric signature of gravitational waves, and examine this result in the context...
