EAS PhD Dissertation Defense by Yun Hao
When: Tuesday,
May 16, 2023
10:00 AM
-
12:00 PM
Where: > See description for location
Description: EAS PhD Dissertation Defense by Yun Hao
Date: Thursday, May 16, 2023
Time: 10:00am
Topic: Testing the Violation of $U_1$ Gauge Symmetry by Yang-Mills Gravity Using the Deflection of Light, and Expanding Universe with an Effective Metric
Location: SENG 102
Abstract:
We study light bending by the sun in the optical frequencies range using Yang-Mills gravity, which is based on spacetime translational ($T_4$) gauge symmetry in inertial frames. This approach provides an effective metric tensor $G_{\mu\nu}(x)$ for classical objects and light rays. The deflection of light angle is calculated to be $\d \phi \approx 1.75''$ in inertial frames without requiring a gauge condition. If the theory is $U_1$ gauge invariant, a different angle of deflection $\d \phi \approx 1.53''$ is obtained, but experimental precision cannot rule out either result.
We propose a Big Jets model for the beginning of the universe, with two oppositely directed jets evolving into a matter half-universe and an antimatter half-universe, both following the same expansion dynamics. We assume an "effective metric tensor" based on Yang-Mills gravity and obtain time-dependent scale factors and the estimated age of the universe, $t^{YM}_o \approx 15.3 \times 10^9 yr$. A very weak hemispheric anisotropy in the cosmic microwave background is suggested.
In summary, Yang-Mills gravity provides a new perspective on light bending, cosmic expansion, and the potential existence of a distant antimatter half-universe. Although experimental limitations hinder definitive conclusions, future research may refine our understanding of Yang-Mills gravity and its implications for the cosmos.
ADVISOR(S): Dr. JP Hsu, Department of Physics
(jhsu@umassd.edu)
COMMITTEE MEMBERS: Dr. Jay Wang, Department of Physics
Dr. Dana Fine, Department of Mathematics
NOTE: All EAS Students are ENCOURAGED to attend.
Date: Thursday, May 16, 2023
Time: 10:00am
Topic: Testing the Violation of $U_1$ Gauge Symmetry by Yang-Mills Gravity Using the Deflection of Light, and Expanding Universe with an Effective Metric
Location: SENG 102
Abstract:
We study light bending by the sun in the optical frequencies range using Yang-Mills gravity, which is based on spacetime translational ($T_4$) gauge symmetry in inertial frames. This approach provides an effective metric tensor $G_{\mu\nu}(x)$ for classical objects and light rays. The deflection of light angle is calculated to be $\d \phi \approx 1.75''$ in inertial frames without requiring a gauge condition. If the theory is $U_1$ gauge invariant, a different angle of deflection $\d \phi \approx 1.53''$ is obtained, but experimental precision cannot rule out either result.
We propose a Big Jets model for the beginning of the universe, with two oppositely directed jets evolving into a matter half-universe and an antimatter half-universe, both following the same expansion dynamics. We assume an "effective metric tensor" based on Yang-Mills gravity and obtain time-dependent scale factors and the estimated age of the universe, $t^{YM}_o \approx 15.3 \times 10^9 yr$. A very weak hemispheric anisotropy in the cosmic microwave background is suggested.
In summary, Yang-Mills gravity provides a new perspective on light bending, cosmic expansion, and the potential existence of a distant antimatter half-universe. Although experimental limitations hinder definitive conclusions, future research may refine our understanding of Yang-Mills gravity and its implications for the cosmos.
ADVISOR(S): Dr. JP Hsu, Department of Physics
(jhsu@umassd.edu)
COMMITTEE MEMBERS: Dr. Jay Wang, Department of Physics
Dr. Dana Fine, Department of Mathematics
NOTE: All EAS Students are ENCOURAGED to attend.
Contact: > See Description for contact information
Topical Areas: Faculty, Students, Graduate, Bioengineering, Civil and Environmental Engineering, College of Engineering, Computer and Information Science, Electrical and Computer Engineering, Mechanical Engineering, Physics