[phas-undergrad] [phas-dept] Seminar 9am Wednesday April 17 room 103

William Newton William.Newton at tamuc.edu
Tue Apr 16 10:00:47 CDT 2024


Hi all,

We have a visitor who will give a seminar on Wednesday morning at 9am, about smashing neutron star crusts with gravity! Anyone welcome.

See below for abstract

Will

——

Resonant shattering flares as probes of neutron star structure and nuclear symmetry - Dr. Duncan Neill, University of Bath, UK

Neutron stars (NSs) are compact remnants of massive stars, containing matter that is ultra-dense, cold and neutron rich. Presently, these conditions can not be simultaneously reproduced in terrestrial experiments, making NSs interesting laboratories in which to study nuclear interactions in extreme conditions. However, NS properties measured with current techniques – such as tidal deformability inferred from gravitational waves (GWs) – are sensitive to matter within the star’s core. While this is interesting for examining the possible appearance of exotic phases of matter in the NS core, the range of possible exotic phases limits the ability of these measurements to complement terrestrial studies, as we can not confidently select a type of model with which to describe the NS core.
    In contrast to current techniques, asteroseismology can be used to probe matter throughout NSs, allowing for constraints to be placed on lower density regions where we are confident that matter is nucleonic. While much of the potential of NS asteroseismology will have to wait for future generations of GW interferometers, we consider a signature of NS quasi-normal modes that could be detected by current instruments: resonant shattering flares (RSFs). These flares are produced when a NS mode is resonantly excited by the tidal field of the star’s binary partner shortly before merger, causing the solid outer layers of the NS to shatter. I will discuss how observations of RSFs could be used to constrain properties of matter within the NS crust and subsequently aid current terrestrial efforts to study the nuclear symmetry energy. As there has yet to be any certain detections of RSFs, I will also present estimates of what these flares might look like and how common they may be. Finally, I will examine whether known precursors of short gamma-ray burst could be RSFs, and what the implications of such a conclusion would be.


---
Dr. William Newton (he/him)
Associate Professor
Department of Physics and Astronomy
Texas A&M University-Commerce
Commerce, TX, 75429-3011, USA
Phone: +1 903 366 9331




On Apr 5, 2024, at 4:29 PM, Bao-An Li <Bao-An.Li at tamuc.edu<mailto:Bao-An.Li at tamuc.edu>> wrote:

Sorry everyone, the seminar planned on Monday by Prof. Umesh Garg is cancelled!.

Have a great weekend.
Bao-An Li

Dr. Bao-An Li, Texas A&M University System Regents’ Professor
Department of Physics and Astronomy
Texas A&M University-Commerce
Commerce, Texas 75429-3011, USA
Office: (903) 886-5478
Email: Bao-An.Li at Tamuc.edu<mailto:Bao-An.Li at Tamuc.edu>
http://scholar.google.com/citations?user=-0gnvt4AAAAJ


From: Bao-An Li <Bao-An.Li at tamuc.edu<mailto:Bao-An.Li at tamuc.edu>>
Date: Wednesday, April 3, 2024 at 9:05 AM
To: "'phas-dept at tamuc.edu<mailto:phas-dept at tamuc.edu>'" <phas-dept at mailman.tamuc.edu<mailto:phas-dept at mailman.tamuc.edu>>
Subject: Seminar at 10-11am on Monday, April 8 in Science 103

Informal Seminar, 10-11am, Monday, April 8, Science 103

Nuclear Incompressibility: How Collective Excitation Modes of a Nucleus Characterize Astrophysical Processes.

Prof. Umesh Garg, University of Notre Dame
https://physics.nd.edu/people/umesh-garg/
To the students: Dr. Garg has been the director of their physics REU program for about 30 years, he will stop by the student lunge around 9:30-10am.

The Nuclear Incompressibility parameter is one of three important
components characterizing the nuclear equation of state (EOS). It has
crucial bearing on diverse nuclear and astrophysical phenomena,
including radii of neutron stars, strength of supernova collapse, emission
of neutrinos in supernova explosions, and collective flow in medium- and
high-energy nuclear collisions.  In this talk I will review current
status of the research on direct experimental determination of nuclear
incompressibility via the compressional-mode giant resonances. In particular,
measurements on a series of Tin and Cadmium isotopes have provided an
"experimental" value for the asymmetry term of nuclear incompressibility, which
can provide constraints on the EOS of neutron stars.

<image001.png>


About the speaker:
Umesh Garg, a Professor of Physics at the University of Notre Dame, graduated from BITS-Pilani and obtained a Ph.D. in experimental nuclear physics from the State University of New York at Stony Brook. After postdoctoral work at the Cyclotron Institute, Texas A & M University, he joined the Notre Dame faculty and has been there since. He has held guest professorships at the Free University, Amsterdam, the Netherlands; BARC, Mumbai; GSI, Germany; TIFR, Mumbai; RIKEN, Japan; Peking University, Beijing; Xi'an Jiaotong Univ, Xi'an; and BITS-Pilani. He is a Fellow of the American Physical Society and the American Association for the Advancement of Science.  He also was a Fulbright Senior Scholar and a JSPS Fellow during 2022-23 and is a Fulbright Specialist on Physics Education through 2026. The current focus of his research work is low-energy nuclear structure, with special emphasis on connection of nuclear physics to the physics of neutron stars.
-------------------------------------------
Prof. Umesh Garg (he/him/his)                                                     211 Nieuwland Science Hall
Professor of Physics and Astronomy                                                      Notre Dame, IN 46556
Fellow, Liu Institute for Asia and Asian Studies                                                                 USA
Fellow, Rome International Scholars Program                        Phone (office): +1.574.631.7352
Fulbright Specialist (Physics Education) 2023--

 [Image removed by sender.]
Board of Editors, Progress of Theoretical and Experimental Physics
Distinguished Adjunct Professor, BITS-Pilani, India
Adjunct Professor, Tata Institute of Fundamental Research, India
                                                 SATYAM     SHIVAM     SUNDARAM
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