What is Lqg: Definition and 262 Discussions

The Clowes–Campusano LQG (CCLQG; also called LQG 3 and U1.28) is a large quasar group, consisting of 34 quasars and measuring about 2 billion light-years across. It is one of the largest known superstructures in the observable universe. It is located near the larger Huge-LQG. It was discovered by the astronomers Roger Clowes and Luis Campusano in 1991.

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  1. M

    Lack of Books on Loop Quantum Gravity (LQG)

    I was wondering, why are there no books on LQG? For string/M- theory you have "The Elegant Universe", "Hyperspace", "Beyond Einstein", and numerous others. But, for LQG, the closest I may have found (and I'm not even sure about this, since I just got the book, and haven't really started...
  2. MathematicalPhysicist

    LQG and the begining of the universe

    i would like to know what does loop quantum gravity say about the beginning of the universe does it confirm it had a beginning in the big bang (if it doesn't confirm them shouldn't it be in contradiction with GR)? and does it say something about "before the big bang"?
  3. E

    How does LQG compare to string field theory?

    I figured I'd start this forum off with something about the 2 stringy theories of quantum gravity. Both loop quantum gravity and string theory propose that everything is made of 1 dimensional loops, or strings. Both are quantum theories, not classic. This means that strings are not moving around...
  4. marcus

    What is the significance of the Sahlmann algebra in loop quantum gravity?

    I was just reading a paper co-authored by Jerzy Lewandowski which is dated June 24 2003----but also dated February 2003, I don't know which applies. http://arxiv.org/gr-qc/0302059 It begins "the quantum holonomy operators and the quantum flux operators are the basic elements of quantum...
  5. H

    LQG: String Theory? - Baez's Page

    Was reading Baez's page and came across this link: http://math.ucr.edu/home/baez/week18.html It's somewhat interesting, have a read. :smile:
  6. MathematicalPhysicist

    Mathematica Mathematical framework of lqg against string theory?

    what the differences in the mathematical framework in the two theories? i know i heard that the maths of string theory is of 21th century (which is now).
  7. E

    How Does Quantum Probability Affect Discrete Space in Loop Quantum Gravity?

    I'm wondering how the discrete space in LQG is effected when it becomes a quantum field. In any given volume, you normally could find a continuous amount of intersecting field lines. In LQG, those lines or loops) are discrete, and space is basically a lattice of sorts. So in that case, there...
  8. F

    Math for LQG: Books & Resources for Graduate Level Understanding

    I'd like to acquire more than a casual understanding of LQG, and to do that I need the math first. My math background has been acquired ad-hoc while pursuing a degree in Astronomy. A smattering of group theory here, enough differential geometry and tensor gymnastics to read Gravitation (Thorne &...
  9. A

    Fotini Kalamara - LQG or Superstring

    I am having a dispute over what exactly Kalamara is hoping to achieve and what model she is applying. Is it LQG or Superstring? Thanks.
  10. E

    String Theory & LQG: Explaining Particles & Forces

    In string theory, all particles and forces of nature of mere results of vibrating strings. Can LQG offer an alternative explanation for the zoo of particles we find? I seem to recall reading that the theory proposes that quarks are where edges of the lattice intersect, but I can't recall where...
  11. S

    Exploring Supernumerary Dimensions & the LQG Theory

    I have readed a bit about them in an interview to Lisa Randall. I have an idea of what they are. But don´t know the detaills of how it is working. That is, they implment the idea of supernumerary dimensios because only gravity can leave the brane (a d-brane if i am not wrong) while the...
  12. marcus

    A clarification of LQG by Lubos Motl

    http://www.arxiv.org/abs/gr-qc/0212096 Lubos Motl (at Harvard's Jefferson Phys. Lab.) this paper is pure gold for what it does on the side quite apart from what you might expect from the title, which sounds narrowly focused on a specialized technical issue. what Motl gives on the...
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