Conveners
Theory
- Sunghoon Jung (Korea Institute for Advanced Study (KIAS))
Theory
- Pedro Schwaller
Theory
- There are no conveners in this block
Theory
- There are no conveners in this block
Theory
- Anish Ghoshal (University of Warsaw, Poland)
Theory
- There are no conveners in this block
Theory
- Geraldine Servant (Deutsches Elektronen-Synchrotron (DE))
Theory
- Giancarlo Cella (INFN - National Institute for Nuclear Physics)
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Jacob Sprague05/12/2023, 10:00
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Francesco Sorge05/12/2023, 14:30
The interaction between a very-high-frequency gravitational wave (VHFGW) and an electromagnetic wave (EMW) in a rectangular waveguide is discussed in the weak field limit. The background EMW is assumed to be initially in the TE10 mode along the waveguide. It is then shown that a VHFGW, having the same frequency and direction of propagation of the EMW, induces through the waveguide a TE mode...
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Germain Tobar05/12/2023, 14:45
The quantization of gravity is widely believed to result in gravitons -- particles of discrete energy that form gravitational waves. But their detection has so far been considered impossible. Here we show that signatures of single gravitons can be observed in laboratory experiments [1]. We show that stimulated and spontaneous single-graviton processes can become relevant for massive quantum...
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Nicholas Llewellyn Rodd (CERN)05/12/2023, 15:00
A key dividing line in the dark matter community is between the wave and particle regimes. This division can be applied to any bosonic state, and for gravitational energy density the boundary cuts right through the ultra-high frequency regime. I will discuss the implications of this for instruments looking to detect a signal in the regime where gravity is a dilute gas of gravitons, and explain...
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Gabriele Franciolini (CERN)06/12/2023, 14:00
Primordial Black Holes might have originated in the early universe from the collapse of large overdensities and could constitute a sizeable portion of dark matter. Recently, they have gained considerable attention because of the various gravitational wave (GW) signatures associated with this scenario, making them testable with current and future GW experiments. In this talk, I will provide an...
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Tao Liu (The Hong Kong University of Science and Technology)07/12/2023, 09:30
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Anna Tokareva (Hangzhou Institute for Advanced Study & ICTP-AP Centre Beijing/Hangzhou)07/12/2023, 11:30
Since the models of inflation compatible with CMB data require non-renormalizable inflaton potentials, it is natural to have extra couplings between inflaton and gravitons. The suppression scale of such operators can well be lower than the Planck scale. Due to these couplings, inflaton can produce high frequency gravitons during reheating due to both decay and bremsstrahlung process. In my...
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Jan Schuette Engel (UC Berkeley)07/12/2023, 11:45
The thermal plasma in the early universe produced a guaranteed stochastic gravitational wave (GW) background, which peaks today in the microwave regime and was dubbed the cosmic gravitational microwave background (CGMB). The CGMB spectrum encodes fundamental information about particle physics and gravity at ultra high energies. In particular, one can determine from the CGMB spectrum the...
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Wolfram Ratzinger (Weizmann Institute)07/12/2023, 12:00
There has recently been an increased interest in electro-magnetic GW detectors, due to the first detections of GWs and the rapid evolution of the technology driven by searches for light dark matter. The question how to calculate the response of e.g. a cavity to a GW has been debated since the 80s and the current understanding is that the usage of a special frame, the proper detector frame, is...
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Asuka Ito (Tokyo institute of technology)07/12/2023, 14:30
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Carlos Tamarit (Technische Universität München)07/12/2023, 14:45
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Killian MARTINEAU (Laboratoire de Physique Subatomique et de Cosmologie)08/12/2023, 09:30
Recent advances in high-energy and high-peak-power laser systems have opened up new possibilities for fundamental physics research.
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I propose to discuss the potential of twisted light for the generation of gravitational waves in the high frequency regime.
Focusing on Bessel beams, analytic expressions and numerical computations for the generated metric perturbations and associated powers... -
Anish Ghoshal08/12/2023, 09:45
Inflaton seeds non-thermal leptogenesis by pair producing right-handed neutrinos in the seesaw model. We show that the inevitable graviton bremsstrahlung associated with inflaton decay can be a unique probe of non-thermal leptogenesis. The emitted gravitons contribute to a high-frequency stochastic gravitational waves background with a characteristic fall-off below the peak frequency. Besides...
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Prof. Juan Garcia-Bellido (IFT-UAM/CSIC)08/12/2023, 10:00
In this talk I will try to clarify the situation about astrophysical sources that might be observed with haloscope experiments like GrAHal, sensitive to gravitational waves in the 1-10 GHz band. The GrAHal setup is taken as a benchmark. We follow a very pedagogical path so that the full analysis can easily be used by the entire community who might not be familiar with the theoretical...
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Mikel Sanchez-Garitaonandia08/12/2023, 11:30