What are the recent advancements in quantum gravity?

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Discussion Overview

The discussion revolves around recent advancements in quantum gravity, exploring various theories and approaches within the field. Participants share their interests, challenges in finding current trends, and potential research directions, including theoretical frameworks and mathematical foundations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant expresses interest in pursuing a PhD in quantum gravity but finds it challenging to identify recent developments in the field.
  • Another participant mentions holographic duality as a widely accepted advancement in quantum gravity.
  • A participant reflects on the historical significance of the "No Hair Theorem" of black holes, emphasizing its impact on black hole physics and the excitement surrounding early discoveries.
  • Some participants discuss various approaches to quantum gravity, including causal sets, causal dynamical triangulation, and asymptotic safety, indicating a willingness to engage deeply with the subject despite its challenges.
  • Several papers are recommended for further reading, covering topics such as string theory, particle physics, and quantum gravity, which may inspire future research.
  • A participant suggests a method for indirectly detecting gravitons, referencing a specific paper on the topic.
  • Another participant proposes the idea that classical spacetime may emerge from quantum entanglement, citing concepts like "It from bit" and relevant researchers.
  • Additional references to papers are shared, indicating ongoing research and exploration in the field.

Areas of Agreement / Disagreement

Participants express a range of interests and perspectives on the advancements in quantum gravity, with no clear consensus on which developments are most significant or promising. Multiple competing views and approaches remain present in the discussion.

Contextual Notes

Participants acknowledge the complexity and evolving nature of quantum gravity research, with some expressing uncertainty about the current state of the field and the challenges of entering it.

Who May Find This Useful

Individuals interested in theoretical physics, particularly those focusing on quantum gravity, string theory, and related mathematical frameworks, may find this discussion valuable.

ProtonNeutron
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I am currently doing my masters in theoretical physics and I would like for my phd to be something quantum gravity oriented. However it seems hard to find what's "hot" in the field those past few years and I only know the basics of these topics (though I believe this can be improved). What are some of the relatively revent advances? Is getting into the field really worth it (asking this from a research perspective)? And if it is how do I approach this?
 
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Everyone has his own opinion on the matter. One of the most generaly accepted development is probably holographic duality.
 
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ProtonNeutron said:
whats "hot"
That usually means that all the easy stuff has already been done.

From an article about Werner Israel (one of my undergrad professors):

Israel’s proof became known as the “No Hair Theorem of Black Holes, with “hair” being physicists’ slang for mathematical complications. It shows only two numbers are needed to describe any black hole: its mass and its spin.“

It surprised everybody,” said Israel. “Even Stephen was surprised and very, very impressed by that paper.”

He said Hawking in one of his popular books later credited Israel with having “revolutionized black-hole physics.”

“I think he was being a little too kind,” said Israel.

He called his discovery a mixture of luck and timing. It was early on in the physicists’ examination of black holes and not many were interested.

“Back then very few people even believed in them, even Einstein didn’t believe,” said Israel. “Black holes were just too exciting.”

“So it was very good to get in at the beginning.” he said. “It was actually very easy then to make great discoveries.”
 
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Keith_McClary said:
That usually means that all the easy stuff has already been done.
Yeah that's obviously fair to say. However I still find the subject immensly interesting and compelling. I would like to examine some approaches like causal sets, causal dynamical triangulation or asymptotic safety as well as improve my general knowledge on the subject and its associated mathematics. I know this will surely be an extremely hard journey but I'm willing to take it.
 
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Maybe the way classical spacetime emerges from quantum entanglement using tensor networks? See e.g. "It from bit", Van Raamsdonk, Preskil, etc.
 
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