Observations show that galaxies have magnetic fields with a component that is coherent over a large fraction of the galaxy with field strengths of order microGauss. These fields are supposed to be the result of the amplification of initial weak seed magnetic fields of unknown nature. There are two scenarios for their origin under current discussion: a bottom-up (astrophysical) one, where the...
The nature of dark matter is one of the most longstanding and puzzling questions in physics. With cosmological measurements we have been able to measure its abundance with great precision. Yet, what dark matter is composed of remains a mystery.
In 2016 the first ever observation of gravitational waves from the coalescence event of two black holes was achieved by the LIGO...
Recent detections by LIGO have shown evidence of black hole mergers in the galaxy. While current black hole formation is well understood, numerous works have investigated methods through which they could be created in the early universe. We investigate constraints on the abundance of these black holes known as primordial black holes (PBHs) in the mass range $10^{15}-10^{17}$ g using data from...
The gravitational waves measured at LIGO are presumed here to come from merging primordial black holes. We ask how these primordial black holes could arise through inflationary models while not conflicting with current experiments. Among the approaches that work, we investigate the opportunity for corroboration through experimental probes of gravitational waves at pulsar timing arrays. We...
Primordial black holes evaporate by Hawking radiation, leaving a stochastic gravitational-wave background today. Its spectrum is affected by the formation mass, angular momentum and initial abundance. In particular, the particle emission is greatly enhanced at high frequencies for fast-rotating black holes. In this work, we calculated this spectrum for a wide range of these parameters....
Since the detection of the gravitational wave(GW) signals by LIGO, an increasing attention has been given to the GWs generated during the first order Electroweak phase transition(EWPT), a process essential for a successful generation of the baryon asymmetry in the universe. I will present in this talk a scenario where such GWs are generated during a two step EWPT triggered by the dark matter...
The recent measurements of the Cosmic Microwave Background (CMB) from the Planck telescope, and of the Large Scale Structure (LSS) from different experiments, have confirmed the standard model of cosmology, or $\Lambda CDM$. Nevertheless, many alternative cosmological models are also consistent with this data. Some mild tensions between Planck, the measurement of the Hubble parameter ($H_0$),...
The composition of the primary particle in cosmic ray air showers is of general interest. Measuring the penetration depth of showers allows for template fits of this composition. We use simple generic new physics models to compare the penetration depth distribution of new physics versus primary composition. We argue that complementary information is needed to disentangle these effects and show...
