Season 3 Episode 6 PhD Seminar

Wednesday 30 Mar 2022, 18:00 → 19:10 Europe/Rome

Aula Rasetti (VEF) and Zoom

16th meeting of physics PhD seminar series

If you want to attend in person, sign the doodle here:
https://doodle.com/meeting/participate/id/pen4AvEb

https://uniroma1.zoom.us/j/88384154993
Meeting ID: 883 8415 4993
Passcode: 385588

Please sign up to the mailing list:
https://groups.google.com/u/1/a/uniroma1.it/g/phd-seminars

You can submit abstracts using the following link:

https://forms.gle/mgwxqH7dwPHT66gk7

18:00 → 18:20 Neutron star radius-to-mass ratio from accretion disc occultation

The equation of state (EoS) of ultradense matter in neutron stars (NSs) contains key information on the strong force and possible exotic states of matter; however, it is only poorly constrained from earth-based experiments and theory, while precise measurements of NS masses (M) and radii (R) would act as proxies of the EoS. I present a new method to measure the R/M ratio of disk-accreting NSs exploiting the occultation of the inner disk region right behind the NS by its surface. By simulating observations of a near-future mission we found that R/M can be measured to <5% precision, which is the one required to draw quantitative conclusions on the EoS of ultradense matter.

Speaker: Riccardo La Placa

PresLaPlaca.pdf

18:20 → 18:30 Dicussion

18:30 → 18:50 Pressure in Active Bacterial Bath

Active matter is driven system in which energy is supplied directly, isotropically and independently to individual constituents, who dissipate it to achieve persistent motion. Active particles, at micron scale, are capable of generating mechanical power. However, thermodynamic concept of pressure vaguely defined in them. We experimentally study active systems using genetically modified phototactic E. coli strains along with dynamic light patterning. Using Two Photon Polymerisation to fabricate detailed 3D micro-structures and holographic tweezers to measure the forces acting on them, the goal is to understand pressure in active systems and eventually design microstructures having optimal propulsion in active baths.

Speaker: Ojus Bagal

PhD seminar presentation.pptx

18:50 → 19:00 Discussion