New theory for Quantum Gravity

[BMAONE23]

Could this be the beginning of greater understanding of Gravity?

[bystander]

Quantum Gravity at a Lifshitz Point;
Petr Hořava; 2009 March 2

On the Extra Mode and Inconsistency of Hořava Gravity;
Diego Blas, Oriol Pujolas, Sergei Sibiryakov; 2009 October 9

For those interested, both papers are available at arxiv.org in pdf. Warning, very math intensive.

See also the companion SA article.

[bystander]

PIRSA:C09026 - Gravity at a Lifshitz Point
Recorded conference talks from the November 2009 Perimeter Institute
for Theoretical Physics Conference on Gravity at a Lifshitz Point

If anyone knows of a Hořava Gravity for Dummies, please share it.

[The Code]

Could this be the beginning of greater understanding of Gravity?

Did you not mean to say. Could this be the beginning of a greater understanding of everything?

What else would change if this was implemented?

[Radar Blue]

be the beginning of greater understanding of Gravity?

Could this be the beginning of a greater understanding of everything?

He has an interesting angle, and that is the pulsing of the big bang.
It does not contract so much as conventional big bang. And scores in cuddliness.
His universe pulses like a muscle,in - omni potent vaccum.

The idea, is derived from Fred Hoyle and Mr. Chandra
who said the same thing like 40 years ago.
They claimed a continous creation of stellar mass and galaxies.

Question is : Can the theory simulate a total disaster ?
And when all goes wrong, does the system repair itself ?

[bystander]

Rethinking Einstein: The end of space-time
New Scientist | Physics and Math | 09 Aug 2010

Physicists struggling to reconcile gravity with quantum mechanics have hailed a theory – inspired by pencil lead – that could make it all very simple

IT WAS a speech that changed the way we think of space and time. The year was 1908, and the German mathematician Hermann Minkowski had been trying to make sense of Albert Einstein's hot new idea - what we now know as special relativity - describing how things shrink as they move faster and time becomes distorted. "Henceforth space by itself and time by itself are doomed to fade into the mere shadows," Minkowski proclaimed, "and only a union of the two will preserve an independent reality."

And so space-time - the malleable fabric whose geometry can be changed by the gravity of stars, planets and matter - was born. It is a concept that has served us well, but if physicist Petr Hořava is right, it may be no more than a mirage. Hořava, who is at the University of California, Berkeley, wants to rip this fabric apart and set time and space free from one another in order to come up with a unified theory that reconciles the disparate worlds of quantum mechanics and gravity - one the most pressing challenges to modern physics.

Since Hořava published his work in January 2009, it has received an astonishing amount of attention. Already, more than 250 papers have been written about it. Some researchers have started using it to explain away the twin cosmological mysteries of dark matter and dark energy. Others are finding that black holes might not behave as we thought. If Hořava's idea is right, it could forever change our conception of space and time and lead us to a "theory of everything", applicable to all matter and the forces that act on it.

An approach to a theory of quantum gravity
American Physical Society | Physics Synopses | 20 Apr 2009

At large distances, Einstein’s theory of general relativity describes gravitational physics remarkably well. However, attempts at defining quantum gravity at arbitrarily short distances based on the Einstein-Hilbert action of general relativity fail.

In two papers appearing in Physical Review Letters and Physical Review D, Petr Hořava of the University of California, Berkeley, in the US suggests a novel solution to finding a quantum theory of gravity that is renormalizable. The novelty of Hořava’s approach lies in temporarily abandoning the symmetries that are the cornerstone of general relativity: invariance under general space-time coordinate transformations. Hořava proposes a carefully constructed theory that treats time and space differently but has the virtue of short distance behavior compatible with renormalizability.

But how is this theory related to Einstein’s general relativity—our well-tested theory of gravity? According to Hořava, general relativity arises in the infrared (long distance) limit of his theory where the familiar properties and symmetries of general relativity emerge.

Quantum gravity at a Lifshitz point - P Hořava

• Physical Review D 79 084008 (06 Apr 2009) DOI: 10.1103/PhysRevD.79.084008
  arXiv.org > hep-th > arXiv:0901.3775 > 26 Jan 2009 (v1), 02 Mar 2009 (v2)

Spectral Dimension of the Universe in Quantum Gravity at a Lifshitz Point - P Hořava

• Physical Review Letters 102 161301 (20 Apr 2010) DOI: 10.1103/PhysRevLett.102.161301
  arXiv.org > hep-th > arXiv:0902.3657 > 23 Feb 2009 (v1), 03 Mar 2009 (v2)

General Covariance in Quantum Gravity at a Lifshitz Point - P Hořava, CM Melby-Thompson

• arXiv.org > hep-th > arXiv:1007.2410 > 14 Jul 2010

CDT meets Horava-Lifshitz gravity - J Ambjorn et al

• arXiv.org > hep-th > arXiv:1002.3298 > 17 Feb 2010 (v1), 06 Apr 2010 (v2)

On the Extra Mode and Inconsistency of Horava Gravity - D Blas et al

• arXiv.org > hep-th > arXiv:0906.3046 > 17 Jun 2009 (v1), 09 Oct 2009 (v2)

A healthy extension of Horava gravity - D Blas et al

• arXiv.org > hep-th > arXiv:0909.3525 > 21 Sep 2009

Dark matter as integration constant in Horava-Lifshitz gravity - S Mukohyama

• arXiv.org > hep-th > arXiv:0905.3563 > 22 May 2009 (v1), 13 Aug 2009 (v4)

The Cosmological Constant and Horava-Lifshitz Gravity - C Appignani et al

• arXiv.org > hep-th > arXiv:0907.3121 > 17 Jul 2009 (v1), 19 Jul 2009 (v2)

arXiv.org > Search > Title: Horava Gravity OR Title: Lifshitz Gravity (140 results)

[oldnewideas]

This whole thing was discussed long ago on this forum.

[oldnewideas]

Rethinking Einstein: The end of space-time
New Scientist | Physics and Math | 09 Aug 2010

Physicists struggling to reconcile gravity with quantum mechanics have hailed a theory – inspired by pencil lead – that could make it all very simple

Hořava, who is at the University of California, Berkeley, wants to rip this fabric apart and set time and space free from one another ...
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This too was proposed as simplicity itself not long ago on this forum.