# Gravitational-wave cosmology with dark standard sirens: forecasts using binary black hole observations in the 3G era

Abstract

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Abstract

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Abstract

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We study the low-energy effective action for relativistic superfluids obtained by integrating out the heavy fields of a UV theory. A careful renormalization procedure is required if one is interested in deriving the effective theory to all orders in the light fields (but still to fixed order in the derivative expansion). The result suggests a general relation between finite density and spontaneous symmetry breaking for QFTs of interacting scalars with an internal global symmetry.

One of the cornerstones of inflationary cosmology is that the large

scale structure of the Universe has a quantum mechanical origin. This

invites the question of whether compelling observational evidence for

the quantum nature of the origin can be found. Primordial

gravitational waves are generated directly from quantum fluctuations

during inflation. Since they interact with matter very weakly, travel

through the Universe virtually unimpeded, it is expected that they

keep their nonclassicality until today. In this talk, I will present

scale structure of the Universe has a quantum mechanical origin. This

invites the question of whether compelling observational evidence for

the quantum nature of the origin can be found. Primordial

gravitational waves are generated directly from quantum fluctuations

during inflation. Since they interact with matter very weakly, travel

through the Universe virtually unimpeded, it is expected that they

keep their nonclassicality until today. In this talk, I will present

The coefficients of the operators of an effective field theory (EFT) are constrained to satisfy certain inequalities, under the (mild) assumption that the UV completion satisfies general requirements of causality and unitarity. We begin the extension of these ideas to theories where the Lorentz symmetry is spontaneously broken, as it happens in cosmology and condensed matter physics. Constraints are derived using dispersive arguments for the 2-point function of conserved currents and of the stress-energy tensor.

We will talk about a scenario that inflaton dissipates energy into another field due to an instability. The fluctuations of the new field are the dominant contribution to the primordial power spectrum and non-Gaussianities.

All black holes in the Universe are believed to be rotating. This poses interesting questions, since rotating black hole solutions of Einstein’s equations of General Relativity possess a so-called Cauchy horizon in their interior, which threatens the predictability of Einstein’s theory. However, these exact solutions may not model sufficiently accurately black holes in Nature, which have classical matter in their neighbourhood and, furthermore, are inevitably surrounded by a quantum vacuum (which is responsible for Hawking radiation).

Title: Properties of average distances and emergent causality

Abstract: In the presence of a (quantum or classical) statistical ensemble of metrics one can consider averages of distances between points/events, as long as a prescription is assigned for identifying such points.

The spectrum of positrons in cosmic rays is currently measured with unprecedented precision by AMS-02 up to TeV energies, and represents an unique probe for the local properties of our Galaxy. Currently, its interpretation is still debated, especially for the excess above 10 GeV which suggests the presence of a local, primary source.

Recently, the observation of extended gamma-ray halos around Galactic pulsars has opened a new window to constrain the acceleration and propagation of positrons in our Galaxy.

Recently, the observation of extended gamma-ray halos around Galactic pulsars has opened a new window to constrain the acceleration and propagation of positrons in our Galaxy.