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 Physics at Virginia

"The search for light dark matter with DAMIC-M"


Dr. Danielle Norcini , University of Chicago
[Host: Chris Neu]
ABSTRACT:

The existence of dark matter has been long established through astrophysical and cosmological observations, yet we still do not know what it is made of. Direct detection experiments have extensively searched for dark matter particles above the proton mass for decades. However, recent technological developments have made it possible to look for lighter (sub-GeV) dark matter candidates with single-electron cameras. These “skipper” charged-coupled devices (CCDs) are used as both the target material and detector in the DAMIC-M experiment underneath the French Alps. We will discuss the status of the experiment and first results from the prototype Low Background Chamber installed at the Laboratories Souterrain de Modane.

High Energy Physics Seminar
Wednesday, December 6, 2023
4:00 PM
Astronomy Building, Room 265
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Eleni Katifori , University of Pennsylvania
[Host: Marija Vucelja]
ABSTRACT:

TBA

Colloquium
Friday, January 19, 2024
3:30 PM
, Room TBA
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"Towards Tests of General Relativity with Gravitational Waves from Precessing Binaries"


Nicholas Loutrel , University of Milano-Bicocca)
[Host: Kent Yagi]
ABSTRACT:

Compact objects possessing complicated multipole structure will generally cause precession of the orbital plane when present in a binary system. The most common example of this within general relativity is so-called spin precession, which is caused when the spin angular momentum of the compact object couple to each other, as well as the orbital angular momentum. The precession of the latter of these induces modulations in both the frequency and amplitude of the observed gravitational wave emission of the binary, effects which play a crucial role in parameter estimation. However, if general relativity is not the correct theory of gravity at astrophysical scales and must be modified, or the compact objects have significantly more complicated multipole structure beyond that of a simple pole-dipole, the precession dynamics of the binary will also be modified from that of standard spin precession. Such modifications will necessarily be imprinted in the waveform generated by the precessing binary, opening the door to performing tests of general relativity within the precessing sector of binary dynamics.

In this talk, I will present recent work towards understanding how to use observations of gravitational waves from precessing binaries. As examples, I will discuss two modifications of the standard spin precession paradigm. The first is spin precession in dynamical Chern-Simons gravity, a parity-violating modified theory of gravity that has proven difficult to constrain with non-precessing binaries, and the second is exotic compact objects within general relativity that possess non-axisymmetric violations of the no-hair theorems, such as multipolar boson stars. I will discuss how these two examples allow us to propose an extension of the parameterized post-Einsteinian framework to generic precessing binaries. While work on the first of these two examples is ongoing, I will present projected constraints that one can obtain from this framework on violations of the no-hair theorems with future gravitational wave observations.

Gravity Seminar
Monday, January 22, 2024
1:30 PM
, Room Zoom
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https://virginia.zoom.us/j/96623644155?pwd=MzFGMnEvTWwrVDU5L3JRdnVqOVJnUT09

 

Meeting ID: 966 2364 4155

Passcode: 813439


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Naoko Kurahashi Neilson , Drexel University
[Host: Craig Dukes]
ABSTRACT:

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High Energy Physics Seminar
Wednesday, January 24, 2024
4:00 PM
, Room TBA
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"Voxelated Bioprinting: Digital Assembly of Viscoelastic Bio-ink Particles"


Liheng Cai , University of Virginia
[Host: Bellave Shivaram]
ABSTRACT:

Analogues of pixels to two-dimensional (2D) pictures, voxels –– in the form of small cubes or spheres –– are the basic units of three-dimensional (3D) objects. Digital assembly of bio-ink voxels may provide an approach to engineering heterogeneous yet tightly organized 3D tissue mimics. However, this approach requires precisely manipulating highly viscoelastic bio-ink voxels in 3D space, which represents a grand challenge in both soft matter science and biomanufacturing. In this talk, I will introduce a voxelated bioprinting technology that enables the Digital Assembly of Spherical bio-ink Particles (DASP). First, I will discuss the criteria for the on-demand generation, disposition, and assembly of viscoelastic bio-ink droplets in an aqueous environment without the help of large interfacial tension. Second, I will describe how to use DASP to create 3D structures consisting of interconnected yet distinguishable bio-ink particles. Finally, I will share our recent progress in applying DASP to encapsulate islets into multiscale porous scaffolds to treat type 1 diabetes. I will also discuss immediate applications and emerging challenges associated with voxelated bioprinting.

Condensed Matter Seminar
Thursday, January 25, 2024
3:30 PM
, Room TBA
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Reserved
[Host: Seunghun Lee]
ABSTRACT:

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Colloquium
Friday, January 26, 2024
3:30 PM
, Room TBA
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Dr. Rachel Hyneman , SLAC
[Host: Chris Neu]
ABSTRACT:

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High Energy Physics Seminar
Wednesday, January 31, 2024
4:00 PM
, Room TBA
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Renee Fatemi , University of Kentucky
[Host: Simonetta Liutu]
ABSTRACT:

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Colloquium
Friday, February 2, 2024
3:30 PM
, Room TBA
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Reserved
[Host: Seunghun Lee]
ABSTRACT:

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Colloquium
Friday, February 16, 2024
3:30 PM
, Room TBA
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Reserved
[Host: Seunghun Lee]
ABSTRACT:

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Colloquium
Friday, February 23, 2024
3:30 PM
, Room TBA
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Reserved
[Host: Seunghun Lee]
ABSTRACT:

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Colloquium
Friday, March 1, 2024
3:30 PM
, Room TBA
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To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Seminars and Colloquia), date, name of the speaker, title of talk, and an abstract (if available).