Questions tagged [research-level]
The research-level tag applies to questions that arise in graduate and post-secondary work. These questions often require domain-specific knowledge and could not be answered from a general source or may be beyond the level typically covered by Wikipedia and other popular sources. Research-level questions should not require new or groundbreaking research and results to answer.
676 questions
-7 votes
0 answers
71 views
Research stuck at TRL-3 [closed]
In collaboration with a university in the UK I had done research on light detection by electronic photosensors. But the project is stuck at TRL-3 and we are not able to move forward. Can someone ...
- 33
-7 votes
0 answers
88 views
What is the correct process for finding a qualified reviewer for confidential mathematical verification of a new theoretical framework? [closed]
I am an independent researcher who has developed a theoretical framework in mathematical physics, and I am seeking a qualified professional who can privately verify the derivations. I am not asking ...
- 1
11 votes
1 answer
244 views
Is there a consensus about the implications of the DESI results?
A while ago, the Dark Energy Spectroscopic Instrument (DESI) released its first data. As far as I understand, the results suggested dark energy may not be well described by a cosmological constant (as ...
- 25.7k
6 votes
1 answer
208 views
Soft graviton theorem and derivatives of the dirac $\delta$ function with respect to the hard momenta [duplicate]
I am reading the paper titled Testing Subleading Multiple Soft Graviton Theorem for CHY Prescription. In the text corresponding to eqs. (3.1) through (3.7), the authors justify why $$\sum_{a=1}^n\frac{...
- 4,449
0 votes
0 answers
58 views
Angular momentum operator acting on a Fock state [duplicate]
I am reading Subleading soft dressings of asymptotic states in QED and perturbative quantum gravity by Choi and Akhoury. The authors, at some point, write the following expressions for the total ...
- 4,449
1 vote
0 answers
76 views
Determining the distance to an emission from "plume width" assuming a plume is gaussian
I am measuring pollutant concentrations, from a source downwind, using aircraft data. Occasionally, I observe an enhancement related to an upwind emission, and this enhancement lasts for some amount ...
- 11
2 votes
3 answers
284 views
What is the dual asymptotic spacetime of a CFT on a particular flat manifold?
According to AdS/CFT correspondence, the dual theory of a boundary CFT on flat spacetime is defined on an asymptotically AdS spacetime. The nature of the bulk spacetime depends on the topology of the ...
- 822
1 vote
0 answers
168 views
How to derive Feffermann-Graham expansion for AdS Vaidya geometries?
Introduction The Feffermann-Graham expansion for an asymptotically AdS spacetime [0] looks like Poincare AdS but with the flat space replaced by a more general metric i.e. $$ds^2=\frac{1}{z^2}(g_{\mu \...
- 822
0 votes
1 answer
145 views
Is there any deeper explanation behind this simple acoustic experiment?
my question is a bit inconvenient but let me explain: I recently saw an experiment for primary school where two strings are attended to a coat hanger (see here: https://www.youtube.com/watch?v=...
- 308
2 votes
1 answer
314 views
Determining free Fermi/Bose gas chemical potentials, given temperature, number density, and baryon density
I'm attempting to recreate some plots of individual particle chemical potentials from S. Reddy et. al.'s paper on neutrino interactions in hot and dense matter (of the same title). The specifics aren'...
- 849
1 vote
0 answers
145 views
JT gravity metric - solution to the dilaton equations of motion
I am reading Closed universes in two dimensional gravity by Usatyuk1, Wang and Zhao. The question is not too technical, it is about the solutions to the equations of motion that result from the ...
- 4,449
2 votes
1 answer
1k views
Spontaneous Symmetry Breaking, Vacuum Degeneracy, and Goldstone Bosons applied to large gauge transformations
I am reading Strominger's lecture notes on the infrared structure of gravity and gauge theory. I am trying to understand subchapter 2.11, where the author focuses on the notions of "Spontaneous ...
- 4,449
1 vote
0 answers
122 views
Rigorous justification for firewalls?
Jerusalem lectures by Harlow does a good job in giving a heuristic derivation of firewalls. But the details are not done and no reference is given except for a "related" calculation by ...
3 votes
0 answers
178 views
Why is empty AdS identified with CFT vacuum and what do excited states correspond to?
I have a few questions regarding the AdS/CFT dictionary regarding the state-state map. I have seen people identifying the empty AdS spacetime with a CFT vacuum. What do they mean by "empty" ...
- 822
8 votes
0 answers
200 views
How to derive the probability distribution of reduced density matrix eigenvalues for randomly chosen pure states in Page's theorem?
Motivation I am trying to reproduce the proof in Page's theorem as conjectured in the seminal paper Average Entropy of a Subsystem by Don N. Page. It is crucial in various resolutions of black hole ...
- 822