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The Solar Journey in a Near-Death Experience (NDE): Insights from the Ancient Vedic Texts

The phenomenon of Near-Death Experiences (NDEs) has mystified and enthralled us ever since Raymond Moody wrote the book,

Alaska , United-states , Berkeley , California , Egypt , Canada , Australia , Austria , Sydney , New-south-wales , United-kingdom , Berlin

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Australia , Sydney , New-south-wales , Australian , Cleo-loi , University-of-sydney , West-australian ,

talks.cam : Title to be confirmed

talks.cam : Title to be confirmed
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Cleo-loi , Ghent-university , கிளியோ-லோய் , கெஂட்-பல்கலைக்கழகம் ,

talks.cam : Tides in the high-eccentricity migration of hot Jupiters: Triggering diffusive growth by nonlinear mode interactions

talks.cam : Tides in the high-eccentricity migration of hot Jupiters: Triggering diffusive growth by nonlinear mode interactions
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Cleo-loi , Talks , Eminars , Niversity-of-cambridge , கிளியோ-லோய் , பேச்சு ,

talks.cam : Powering Stellar Magnetism: Energy Transfers in Convective Dynamo of Sun-like Stars

talks.cam : Powering Stellar Magnetism: Energy Transfers in Convective Dynamo of Sun-like Stars
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Saclay , France-general , France , Paris , Allan-sacha-brun , Cleo-loi , Energy-transfers-in-convective-dynamo-of-stars , Stellar-magnetism , Energy-transfers , Convective-dynamo , Sacha-brun

talks.cam : Tidal Sculpting of Short-Period Exoplanets

15:00
If you have a question about this talk, please contact Cleo Loi.
Multiple-planet systems composed of close-in super-Earth/sub-Neptune-sized planets are ubiquitous, representing a dominant outcome of planet formation. This population exhibits predictable hallmarks of architectural regularity and uniformity, such as low eccentricities and inclinations, similar orbital spacings, and intra-system correlations in planetary masses and radii. On top of this first-order structure, however, these systems also exhibit surprising anomalies that require explanation. Examples include (1) ultra-short period planets, whose extremely-irradiated orbits have been separated off from the rest of their systems; (2) planets piled up wide of mean-motion resonances; and (3) a subset of Neptune-sized planets that show signs of radius inflation. In this talk, I will propose that tidal dynamics can account for these specific anomalies and more. Specifically, I will discuss the critical role of enhanced tidal dissipation due to non-zero planetary axial tilts (obliquities), which arise by way of prevalent dynamical resonances. I will highlight strategies for testing these tidal theories and observing obliquities directly in the future.

Cleo-loi , Sarah-millholland , Princeton-university , Talks , Eminars , Niversity-of-cambridge , கிளியோ-லோய் , ப்ரிந்ஸ்டந்-பல்கலைக்கழகம் , பேச்சு ,

talks.cam : Tidal dissipation in stars, with new results on the interaction between fast tides and convection

Friday 14 May 2021, 14:00-
15:00
If you have a question about this talk, please contact Cleo Loi.
I will present new results on tidal dissipation in stars and planets, mainly focussing on tides in convection zones. The interaction between tidal flows and turbulent convection is often considered important for tidal evolution of binary stars and planetary systems but its efficiency for fast tides (when the tidal frequency exceeds the convective turnover frequency) has long been controversial. I will first describe a new analysis of the energy transfer terms between tidal flows and convection that is verified by idealised Boussinesq and anelastic simulations. One result is that Reynolds stresses involving tidal flow components are unlikely to contribute to dissipation of equilibrium tides. I will then review the results of direct numerical simulations in both local and global models (that study Reynolds stresses involving correlations between convective flow components, which likely dominate the interaction), which demonstrate that convection can act like an effective viscosity which falls off quadratically with tidal frequency for fast tides. I will then present calculations studying tidal dissipation in stellar models with masses in the range 0.1-1.6 M_\odot throughout their evolution. These models incorporate turbulent viscosity acting on equilibrium tides and inertial waves in convection zones, and internal gravity waves in radiation zones. I will use these results to compute tidal quality factors following stellar evolution, and tidal evolutionary timescales, for the orbital decay of hot Jupiters, and the spin synchronization and circularization of binary stars.

Adrian-barker , Cleo-loi , University-of-leeds , கிளியோ-லோய் , பல்கலைக்கழகம்-ஆஃப்-லீட்ஸ் ,

talks.cam : Interaction between fast tides and convection with application to giant planets and solar type stars

Monday 10 May 2021, 14:00-
15:00
If you have a question about this talk, please contact Cleo Loi.
We propose a new formalism to calculate the exchange of energy between tides and a convective flow when the turnover timescale is larger than the tidal period. We argue that the standard picture, in which the tides are described as a mean shear flow which is damped by fluctuating convective eddies, is inconsistent and should be reversed. In other words, the fluctuations are the tidal oscillations and the mean shear flow is provided by the largest convective eddies. The rate at which energy is exchanged between the tides and convection is then given by the coupling of the Reynolds stress associated the tidal velocity to the shear associated with the convective velocity. We further argue that, even if energy is intermittently transferred from convection to the tides, it must ultimately return to the convective flow and transported efficiently to the stellar surface on the convective timescale. This is consistent with assuming that energy is locally transferred from the tides to the convective flow. Using this assumption, we obtain values for the tidal dissipation Q factor of Jupiter and Saturn, for the circularization periods of late-type binaries (taking into account the full time evolution of the stellar structure) and for hot Jupiters in good overall agreement with observations.

Caroline-terquem , Cleo-loi , University-of-oxford , கிளியோ-லோய் , பல்கலைக்கழகம்-ஆஃப்-ஆக்ஸ்ஃபர்ட் ,

talks.cam : Gas dynamics in outer regions of protoplanetary disk

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While gas dynamics have been studied in local and global numerical simulations for inner regions ( 10AU) of protoplanetary disks (PPDs), global simulations applicable to outer regions ( 30AU) of PPDs are still lacking. On the other hand, it is revealed in the recent years that the magneto-rotational instability (MRI) is damped or suppressed in a large part of the disk, and hydrodynamic instabilities become crucial to drive turbulence in PPDs. In this talk, I will present our recent results on gas dynamics of outer PPDs through global 2D and 3D non-ideal MHD simulations by Athena++, focusing on the turbulence driven by Vertical Shear Instability (VSI) – one of the most promising hydrodynamic instability in PPDs – under the influence of the non-ideal MHD effects, and the spontaneous magnetic flux concentration that leads to the formation of annular substructures commonly detected with Atacama Large Millimeter/submillimeter Array (ALMA).

Cambridge , Cambridgeshire , United-kingdom , Cleo-loi , Vertical-shear-instability , Atacama-large , Talks , Seminars , University-of-cambridge , கேம்பிரிட்ஜ் , கேம்பிரிட்ஜ்ஷைர்

talks.cam : Title to be confirmed

talks.cam : Title to be confirmed
cam.ac.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cam.ac.uk Daily Mail and Mail on Sunday newspapers.

Cleo-loi , Koh-takahashi , Talks , Seminars , University-of-cambridge , கிளியோ-லோய் , கோ-தகாஹஷி , பேச்சு , கருத்தரங்குகள் , பல்கலைக்கழகம்-ஆஃப்-கேம்பிரிட்ஜ் ,