2024-11-08
09:23 |
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On adiabatic renormalization with an infrared cut-off
/ Conzinu, Pietro (speaker)
We describe a new approach to renormalize physical quantities in curved space-time introducing a comoving infrared cut-off in defining the adiabatic counterpart of the physical quantity under consideration. This infrared cut-off is fundamental to avoid unphysical divergences that can be generated by a pathological behavior of the adiabatic subtraction extended to the infrared domain. [...]
2024 - Streaming video.
TH institutes; Looping in the Primordial Universe
External links: Talk details; Event details
In : Looping in the Primordial Universe
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2024-11-08
09:21 |
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2024-11-07
09:13 |
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Coarse-Grained Holography: Chaos, Eigenstate Thermalization, and 3D Gravity
/ Liška, Diego (speaker) (EPFL/U. Geneva)
In recent years, it has become clear that the path integral of semiclassical 3D gravity offers a "coarse-grained" description of its holographic 2D CFT. This relationship is particularly transparent when considering the statistical moments of operator product expansion (OPE) coefficients in the CFT. [...]
2024 - 3252.
TH String Theory Seminar
External link: Event details
In : Coarse-Grained Holography: Chaos, Eigenstate Thermalization, and 3D Gravity
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2024-11-06
15:52 |
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2024-11-06
14:11 |
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Timing RPCs: 25 years
/ Fonte, Paulo (speaker) (Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea Coimbra Institute of Engineering, Polytechnic University of Coimbra, Portugal LIP - Laboratory of Instrumentation and Experimental Particle Physics, Coimbra, Portugal)
About 25 years ago, in the framework of the ALICE TOF R&D effort, the time resolution of the RPC detector technology was extended to sub-100 ps by decreasing the gap width by about one order of magnitude and adopting the multigap construction method. This resolution range is interesting for particle tagging or identification by time-of-flight and opened the way to practical very large time-of-flight detectors for HEP and nuclear physics.
The 1999/09/27 an EP Detector Seminar was given on this matter, covering the main results and the first explorations in the physics of this detector.
In the present seminar we will revisit the preceding related detectors and the discovery process, summarize the applications that have meanwhile emerged and the status of the theoretical understanding of these detectors..
2024 - 3838.
Detector Seminar
External link: Event details
In : Timing RPCs: 25 years
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2024-11-06
14:11 |
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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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