PIRSA:12100116

# Quantum Gravity and the Weak Interactions

### APA

Smolin, L., Calmet, X., Alexander, S., Litim, D., Gingrich, D. & Stojkovic, D. (2012). Quantum Gravity and the Weak Interactions. Perimeter Institute. https://pirsa.org/12100116

### MLA

Smolin, Lee, et al. Quantum Gravity and the Weak Interactions. Perimeter Institute, Oct. 25, 2012, https://pirsa.org/12100116

### BibTex

@misc{ pirsa_12100116, doi = {}, url = {https://pirsa.org/12100116}, author = {Smolin, Lee and Calmet, Xavier and Alexander, Stephon and Litim, Daniel and Gingrich, Doug and Stojkovic, Dejan}, keywords = {Quantum Gravity}, language = {en}, title = {Quantum Gravity and the Weak Interactions}, publisher = {Perimeter Institute}, year = {2012}, month = {oct}, note = {PIRSA:12100116 see, \url{https://pirsa.org}} }

## Abstract

*Quantum Gravity and the Weak Interactions*

__________________________________

__________________________________

*Motivated by the lack of evidence for physics beyond the Standard Model in the TeV region, we discussed an alternative path for grand unification. We show that simple grand unification models based on e.g. SU(5) can work successfully even without low scale supersymmetry. In particular quantum gravitational effects could easily modify the unification conditions for the gauge and Yukawa couplings.*

**Non-thermal quantum black holes**__________________________________

*Searches for Nonperturbative**Gravitational States at the LHC*Searches for black holes and string balls have recently be performed by LHC experiments. Upper limits have been placed on the production crosssections time experimental acceptance. Hard-disk production of thesestates have been ruled out over most of the current LHC energy reach.However the LHC has said little about nonperturbative states producedin model with reduced cross sections. I will discuss some popularmodels that have not yet been ruled out by the LHC experiments.

_________________________________

*Models of new physics beyond the**Standard Model of Particle Physics*Models of new physics beyond the Standard Model of Particle Physics suggest that the quantum scale of gravity could be as low as the electro-weak or TeV energy scale. If so, they offer the exciting possibility that quantum gravity becomes accessible, experimentally, at particle colliders such as the LHC. From the theory side, low-scale gravity scenarios often require extra dimensions, or a large number of additional particle species.

I propose to discuss the possibility for signatures of low-scale quantum gravity, the feasibility of concrete (quantitative) predictions based on eg. specific processes and quantum gravity set-ups, and options for experimental tests.

__________________________________

*Unification of gravity with the electroweak interactions*