Abstract:  DESI will measure the 3D position of 30 million galaxies during the next five years to precisely characterize the nature of Dark Energy with baryon acoustic oscillations & redshift-space distortions.  Unique signatures present in the large-scale distribution ofgalaxies further limit the level of non-Gaussian fluctuations present in the early Universeand the mechanism of Inflation by extension.  I will introduce the DESI experiment, summarise … Read More

Abstract: I will discuss how the next generation of CMB and Large Scale Structure (LSS) experiments can uncover information about the primordial Universe. I will review the observational signatures of the initial conditions and explain how they are connected to the physics of Inflation. I will then highlight recent techniques that combine CMB and LSS measurements to probe velocity fields … Read More

Azadeh Maleknejad (CERN) “A new paradigm for particle cosmology” Abstract: Modern cosmology has been remarkably successful in describing the Universe from a second after the Big Bang until today. However, its physics before that time is still much less certain. It profoundly involves particle theory beyond the Standard Model to explain long-standing puzzles: the origin of the observed matter asymmetry, … Read More

Abstract: If dark matter is a particle with a mass between the electroweak and Planck scale, we could detect it through its decays to high-energy cosmic rays. Testing this hypothesis requires a detailed understanding of the astrophysics of where these decays are occurring and the particle physics that dictates the spectra of produced cosmic rays. In this talk, I will describe … Read More

Axion-like particles may play a key role in early universe cosmology. They are naturally equipped with the right properties to explain cosmic inflation, can dynamically explain the smallness of the electroweak scale, may be involved in the generation of the matter antimatter asymmetry and are promising dark matter candidates. In this talk I discuss a generic but previously overlooked particle … Read More

Abstract: Well motivated models of dark matter such as inelastic dark matter and strongly interacting dark matter and other dark relics of stable particles are notoriously difficult to detect in direct detection experiments. This is due to their inability to impart large enough recoil energy in traditional methods of direct detection. In this talk, I propose a new paradigm for … Read More

Recent measurements by the Fermilab g-2 experiment seem to confirm the long-standing muon g-2 anomaly first measured by BNL. If theoretical and experimental progress in the coming years confirms the deviation from the Standard Model (SM) expectation, this would represent the first solid evidence of Beyond SM (BSM) physics. Over the years, many models have been proposed to account for … Read More

First-order phase transitions in the early universe could produce stochastic gravitational wave signals observable at future space-based observatories such as LISA; however, existing methods for predicting these signals are limited to weakly-coupled theories. In this talk, I present a new, nonperturbative formalism for false vacuum decay that integrates over local fluctuations in field space using the functional renormalization group. As … Read More

Lawrence Berkeley National Laboratory Physics Division 4D Seminar Monday, June 07, 2020ZOOM TALK https://lbnl.zoom.us/j/215429094 12:30 PM Anirudh Prabu (Stanford) “Axion Production in Pulsar Magnetosphere Gaps”Abstract: Pulsar magnetospheres admit non-stationary vacuum gaps that are characterized by non-vanishing E⋅B. The vacuum gaps play an important role in plasma production and electromagnetic wave emission. We show that these gaps generate axions whose energy … Read More