Quantum Fluids in the Universe

Session

Lighting Talks

Jun 9, 2023, 12:00 PM

Centro Congressi "Le Benedettine" - Pisa

33. Modeling of the iron line profiles emitted by accreting relativistic compact object.

Dr René Šprňa

6/9/23, 12:00 PM

27. How robust are particle physics predictions in asymptotic safety?

Dr Daniele Rizzo

6/9/23, 12:15 PM

The framework of trans-Planckian asymptotically safe quantum gravity has been shown to give phenomenological predictions for new physics content in simple extensions of the Standard Model. However, it is important to note that this heuristic approach relies on simplifying approximations, including the computation of renormalization group equations at 1-loop, an arbitrary definition of the...

28. Positivity Bounds for Effective Field Theories with Spontaneously Broken Lorentz Invariance

Dr Alessandro Longo

6/9/23, 12:30 PM

Positivity Bounds are a very powerful tool to impose constraints on the parameters of low energy effective field theories (EFTs). Starting from the assumption that an EFT admits a UV completion which satisfies Lorentz Invariance, Locality and Unitarity, one can derive a set of inequalities that must be satisfied by the Wilson coefficients of the low energy theory. In the Lorentz Invariant...

32. De Sitter Quasinormal Modes from analytical properties

Dr Flavio Riccardi

6/9/23, 12:45 PM

In a QFT on de Sitter background, one can study correlators between fields pushed to the future and past horizons of a comoving observer. This is a neat probe of the physics in the observer’s causal diamond (known as the static patch). We use this observable to give a generalization of the quasinormal spectrum in interacting theories, and to connect it to the spectral density that appears in...

26. Mechanization of scalar field theory in 1+1 dimensions (Part 1)

Dr Lukáš Rafaj

6/9/23, 2:00 PM

We want to present a version of a general-purpose collective coordinate model that aims to fully map out the dynamics of a single scalar field in (1+1) - dimensions. This is achieved by a procedure that we call a ‘mechanization’: we reduce the infinite number of degrees of freedom down to a finite and controllable number by chopping the field into flat segments connected via joints.

29. Mechanization of scalar field theory in 1+1 dimensions ( Part 2 )

Dr Ondra Karpíšek

6/9/23, 2:15 PM

We want to present an version of a general-purpose collective coordinate model that aims to fully map out the dynamics of a single scalar field in (1+1) - dimensions. This is achieved by a procedure that we call a ‘mechanization’: we reduce the infinite number of degrees of freedom down to a finite and controllable number by chopping the field into flat segments connected via joints.

30. Black holes as probes of ultralight dark matter

Dr Bruno Bucciotti

6/9/23, 2:30 PM

We consider the phenomenological nightmare scenario where dark matter is only coupled gravitationally, thinking of black holes as probes. We choose to focus on wave dark matter because an oscillating massive scalar endows a black hole with hair, whose profile we study by taking a fully analytic approach. We describe the field profile for a wide range of parameters, including rotating dark...

31. Superfluid dark matter flow around cosmic strings

Dr Aline Favero

6/9/23, 2:45 PM

The fundamental nature of Dark Matter (DM) remains an open problem in cosmology. Although LambdaCDM successfully describes it on cosmological scales, the model still faces some challenges on galactic scales. In the Superfluid Dark Matter (SFDM) approach, the DM particles behave as a cold, collisionless fluid on large scales, while forming a Bose-Einstein Condensate (BEC) on the scales of...

25. Investigating some aspects of non-minimal coupling in the context of dynamical stability approach

Dr Anirban Chatterjee (Institute Post-Doctoral Fellow Department of Physics Indian Institute of Technology Kanpur, India)

6/9/23, 3:00 PM

Standard model of cosmology (Λ-CDM model) mainly suffers from two drawbacks, first one is the fine tuning problem and second one is a cosmic-coincidence problem. In this standard model of cosmology, Λ represents the cosmological constant and CDM denotes the cold-dark matter. Another important downside of the Λ-CDM model from the observational perspective is the discrepancy between the present...