CERN Accélérateur de science

Video Lectures

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2024-11-05
13:54
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Renormalization of the primordial inflationary power spectra / Pla Garcia, Silvia (speaker) (King's College London)
In this talk, I will explore the effects of renormalization on the amplitude of the inflationary spectra at scales measurable in the cosmic microwave background. Via a gauge-invariant analysis, I will explain why the standard prediction for the spectra on superhorizon scales is a late-time attractor while they are UV finite at all times. [...]
2024 - 4041. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
13:18
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The Born regime of gravitational amplitudes / Isabella, Giulia (speaker) (UCLA)
I will discuss 2 -> 2 scattering in the regime where the wavelength of the scattered objects is comparable to the impact parameter but much larger than any Compton wavelength in the QFT. In this regime - which differs from the eikonal - the Feynman diagram expansion organizes itself naturally in terms of a geometric (or Born) series that iterates an effective “quantum mechanical” potential [...]
2024 - 4387. TH String Theory Seminar External link: Event details In : The Born regime of gravitational amplitudes

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2024-11-05
13:18
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Physics of and from the large-scale structure of the Universe / Lewandowski, Matthew (speaker)
It is expected that measurements of the large-scale structure of the Universe will soon become our leading sources of fundamental cosmological information. In this talk, I will review some of the major progress, both theoretical and data-oriented, that we have made in understanding the physics of galaxy clustering, as well as what we might hope to learn about new physics (including primordial non-Gaussianities) from these measurements. [...]
2024 - 4457. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
11:54
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Stochastic inflation: key insights, latest advances and future directions / Animali, Chiara (speaker)
During inflation, quantum vacuum fluctuations are stretched beyond the Hubble radius, modifying the large-scale dynamics of the universe. Although typically negligible in the perturbative regime, this backreaction can become significant in regimes leading to primordial black hole (PBH) formation, where large density fluctuations arise, and which are the standard framework for addressing loop corrections. [...]
2024 - 2974. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
11:53
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On the IR divergences in de Sitter: loops, resummation and the semi-classical wavefunction / Cespedes, Sebastian (speaker)
Detecting local Non-Gaussianity provides valuable insights into the early universe's particle composition. Interactions between the inflaton and light particles yield distinctive signatures, potentially observable in upcoming surveys. [...]
2024 - 2530. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
11:53
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IR finite correlation functions in de Sitter space, a smooth massless limit, and an autonomous equation / Petriakova, Polina (speaker) (Bologna U.)
Currently, the study of cosmological correlation functions is extremely favored, and a large number of new techniques are being developed. I will discuss a less-fashioned but very efficient technique to calculate the loop corrections to the correlation function in the long-wavelength approximation. [...]
2024 - 1341. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
11:51
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New analytical results for massive inflationary correlators at tree and loop orders / Xianyu, Zhong-Zhi (speaker)
I will report a few new methods and results we recently obtained on the analytical computation of cosmological correlators with massive exchanges. At the tree level, we derive a complete set of differential equations for an arbitrary number of massive exchanges. [...]
2024 - 2627. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe

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2024-11-05
10:05
Not yet available
Physics of and from the large-scale structure of the Universe / Lewandowski, Matthew (speaker)
It is expected that measurements of the large-scale structure of the Universe will soon become our leading sources of fundamental cosmological information. In this talk, I will review some of the major progress, both theoretical and data-oriented, that we have made in understanding the physics of galaxy clustering, as well as what we might hope to learn about new physics (including primordial non-Gaussianities) from these measurements. [...]
2024 - 4457. Theory Colloquia External link: Event details In : Physics of and from the large-scale structure of the Universe

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2024-11-04
13:55
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Video Messages
2024 - 433. Commemorations; Symposium to celebrate Carlo Rubbia's 90th birthday External links: Talk details; Event details In : Symposium to celebrate Carlo Rubbia's 90th birthday

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2024-11-04
13:55
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Concluding Remarks / Rubbia, Carlo (speaker) (GSSI (Gran Sasso Science Institute))
2024 - 110. Commemorations; Symposium to celebrate Carlo Rubbia's 90th birthday External links: Talk details; Event details In : Symposium to celebrate Carlo Rubbia's 90th birthday

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