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04/06/2025, 10:30
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David Marsh (King's College London)04/06/2025, 10:35
Axions are a hypothetical class of particle predicted in a variety of settings and of utility in solving many mysteries of theoretical physics, most notably as dark matter candidates and solving the strong CP problem. I will describe recent dramatic progress in understanding what string theory predicts about the properties of axions, and the door this opens to test quantum gravity with...
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Thomas Colas (DAMTP - University of Cambridge)04/06/2025, 14:15
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Yann Gouttenoire (MITP)04/06/2025, 15:30
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Dr Djuna Croon (IPPP Durham)04/06/2025, 16:15
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Andrew Gow (Institute of Cosmology and Gravitation, University of Portsmouth)05/06/2025, 09:00
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Vincent VENNIN (LPENS Paris)05/06/2025, 09:45
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Lucien Heurtier05/06/2025, 11:15
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Jo Dunkley05/06/2025, 12:00
I will show new results from the Atacama Cosmology Telescope (ACT), including cosmological constraints from the sixth data release. Using data gathered from 2017 - 2022, the new maps cover 40% of the microwave sky with five times the angular resolution and three times the depth in polarization as the Planck satellite. The improved cosmic microwave background (CMB) measurements at small scales...
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Yann MAMBRINI05/06/2025, 14:00
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Joseph Conlon (Oxford University)05/06/2025, 15:30
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Martin Mosny (University of Oxford)05/06/2025, 16:30
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Panagiotis Giannadakis (King's College London)05/06/2025, 17:00
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Swagat Saurav Mishra (University of Nottingham, UK)06/06/2025, 09:30
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Dr Laura Iacconi (Queen Mary University of London)06/06/2025, 10:45
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Aaron Held06/06/2025, 11:45
I will demonstrate that opposite-sign kinetic terms are no obstruction for long-lived classical motion. I start with a class of polynomial point-particle models for which integrability allows to prove global stability despite the presence of opposite-sign kinetic terms and identify respective physical criteria for the interaction potential. I then generalise to (1+1) dimensional scalar field...
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Martin Mosny (University of Oxford)
Compared to standard cosmology, string cosmologies motivate an extended period of kination after inflation that can be followed by a cosmological tracker and then an epoch of moduli domination. Conventionally, such trackers occur when there is a scalar field with an exponential potential and an additional fluid whose energy density balances the kinetic and potential energy density of the...
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Vincent VENNIN (LPENS Paris)
When primordial inhomogeneities are produced with sufficiently large amplitude in the early universe, they may subsequently collapse into primordial black holes. I will explain why the effect of quantum diffusion during inflation needs to be taken into account in such a case, and how the statistics of cosmological fluctuations can be predicted within the formalism of stochastic inflation, and...
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Yann MAMBRINI
In this talk, we will analysis the gravitational wave spectrum generated in the Universe filled by an inflaton field and a population of primordial black holes.
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Swagat Saurav Mishra (University of Nottingham, UK)
One of the key predictions of the standard inflationary paradigm is the quantum mechanical generation of tensor fluctuations due to the rapid accelerated expansion of space, which later constitute a stochastic background of primordial Gravitational Waves (GWs). The amplitude of the (nearly) scale-invariant inflationary tensor power spectrum at large cosmological scales provides us with crucial...
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Dr Laura Iacconi (Queen Mary University of London)
Both single- and multi-field models of inflation might lead to enhanced scalar fluctuations on scales much smaller than those seeding the large-scale structure formation. In these scenarios, it is possible that the spike of power at high wavenumber might induce large corrections to the scalar power spectrum, e.g. in the form of loop corrections, potentially endangering the perturbativity of...
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Thomas Colas (DAMTP - University of Cambridge)
Friction and noise naturally emerge when gravitational waves propagate through unknown environments. In this talk, I will present a framework that extends effective field theories to systematically incorporate these effects. I will show how fundamental principles — such as symmetries, locality, and unitarity —place constraints on the form of dissipation and noise. Finally, I will discuss the...
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Andrew Gow (Institute of Cosmology and Gravitation, University of Portsmouth)
The stochastic formalism of inflation allows the statistics of the curvature perturbation to be determined in a non-perturbative way, by reframing the quantum fluctuations during inflation as classical stochastic fluctuations. This is most important for the calculation of non-Gaussianity in the far tail of the perturbation probability distributions, where rare objects such as primordial black...
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Joseph Conlon (Oxford University)
I describe how evolving moduli and kination epochs in the early universe can lead to a novel post-inflationary string tracker solution, in which 75% of the energy density of the universe is in the form of a gas of fundamental string loops.
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Yann Gouttenoire (MITP)
In order to explain the large amplitude of the nano-Hertz stochastic gravitational wave background observed in pulsar timing arrays (PTA), primordial sources must be particularly energetic. This is correlated to the generation of large density fluctuations, later collapsing into ultra-compact mini-halo (UCMHs). I will show that if dark matter is made of WIMPs, then photon and neutrino fluxes...
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