Theory Group Lunchtime Seminars
Scheduled seminars are listed below.
Announcements and reminders will be posted to the physics-theory-group-seminar
list.
To join this list:
- Sign into your university email account via webmail.
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- Search for physics-theory-group-seminar and double click on the result.
- Click "join". You will then be added to the email list once approved by a moderator.
To leave this list:
- Sign into your university email account via webmail.
- Click the settings icon along the top icon bar (looks like a cog/gear).
- In the "Search Outlook settings" box type "distribution groups" and click the top search result.
- Under "Distribution groups I belong to" click
physics-theory-group-seminar
. - Click the "leave" icon above the list (looks like two people with a minus sign to their bottom right).
[If you are a member of Theory group, you will receive seminar announcements via physics-theory
or physics-theory-staff
. You do NOT need to subscribe to the above mailing list as well.]
Theory Seminar: Shigeyuki Komura (Tokyo), A three-sphere microswimmer in a structured fluid
We discuss the locomotion of a three-sphere microswimmer in a viscoelastic structured fluid characterized by typical length and time scales [1]. We derive a general expression to link the average swimming velocity to the sphere mobilities. In this relationship, a viscous contribution exists when the time-reversal symmetry is broken, whereas an elastic contribution is present when the structural symmetry of the microswimmer is broken. As an example of a structured fluid, we consider a polymer gel, which is described by a ``two-fluid" model. We demonstrate in detail that the competition between the swimmer size and the polymer mesh size gives rise to the rich dynamics of a three-sphere microswimmer.
[1] K. Yasuda, R. Okamoto, and S. Komura, EPL 123, 34002 (2018).