Views
3 years ago

The Birth of Giants – Bottom Up or Top Down?

The Birth of Giants – Bottom Up or Top Down?

Gravitational

Gravitational Instability Convection • Boss (2004) suggested that convection may cool disk midplane faster than radiation thus leading to fragmentation • Unlikely since cooling in one period requires moving material up and down with close to sonic velocities • In addition gas would inevitably cool adiabatically as it rises • Photosphere would still be cold – cooling time long (Cassen 1993; Rafikov 2007) Slow photospheric cooling is a bottleneck making cooling time long and fragmentation leading to planet formation unlikely

Gravitational Instability External Irradiation. • Disk can remain gravitationally unstable in the presence of external irradiation • Irradiation suppresses fragmentation • Fragmentation is possible only at high mass accretion rates • Relevant in the earliest phases of disk formation, far from the star (> 100 AU) Rafikov 2009

Top Down or Bottom up? - BaltCICA
Top Down + Bottom Up = Comprehensive Community Change
Bottom-up and top-down approaches in Computational Neuroscience
Harmonizing the Bottom-up TIMES and the Top-down GEMINI-E3 ...
“Top-Down” “Middle-Out” “Bottom-Up” - mcisb
Top-down and Bottom-up Approaches to Nanoscale Fabrication
Top-down versus bottom-up D´aithı Stone (stoned@csag ... - IMAGe
Top-Down vs. Bottom Up: Working Towards Consensus ... - CASIOPA
Perception • Why is perception important for cognition? • Top-down ...
Bottom-up and Top-down Perception • Bottom-up perception • Top ...
Blending Top-Down and Bottom-Up Approaches in Conceptual ...
Top-down - Bottom-up? - intrac
Top-Down Versus Bottom-Up Control of Attention in
Bottom Up & Top Down Anchor - Pandrol USA
Dissociating Bottom-Up and Top-Down Processes in a Manual ...
Combining Top-Down and Bottom-Up Approaches To Energy ...
Multi-feature Bottom-up Processing and Top-down Selection for an ...
IV. Processes: Top-down and Bottom-up
A Comparative Study of Bottom-Up and Top-Down ... - Eurecom
Investigation of neural correlates of bottom-up and top-down ...
Top-Down and Bottom-Up Approaches - CAADP
Top-Down vs. Bottom Up - Fgamedia.org
ILIAS at Vienna University: Bottom Up and Top Down
Top-down and bottom-up approach of malnutrition leads to a ...