One well known problem of the standard cosmological constant model is the tension between the high level of clustering observed in the CMB and the one obtained from large-scale structures. This may be an indication that the way dark energy affects clustering might differ from a simple cosmological constant. If dark energy actually couples to dark matter, then the way matter clusters will be altered. A model of coupled quintessence, where dark energy is modeled by a scalar field, is a specific example of how this can be achieved. Using redshift distortion data, we can constrain the coupling between dark matter and dark energy, and show that when a coupling is present the tension with CMB is removed. The data also agrees with the weak lensing results from the KIDS-450 survey. Future missions like SKA and Euclid will be able to distinguish between these models and a simple cosmological constant.

# Is dark energy really constant?

## Next Seminar

## TBC

## Next Journal Club

Session to be resumed.

## Black Hole Workshops

Next workshop:

XI Black Holes Workshop, Lisbon, 2018

17-18 December 2018

Previous workshops in the series:

I Black Holes Workshop, Porto, 2008

II Black Holes Workshop, Lisbon, 2009

III Black Holes Workshop, Minho, 2010

IV Black Holes Workshop, Aveiro, 2011

V Black Holes Workshop, Lisbon, 2012

VI Black Holes Workshop, Minho 2013

VII Black Holes Workshop, Aveiro 2014

VIII Black Holes Workshop, Lisbon 2015

IX Black Holes Workshop, Minho 2016

X Black Holes Workshop, Aveiro 2017

## Numerical data

## GWVerse COST

## StronGrHEP Network

Our group is part of the RISE StronGrHEP network (2016-2019)

Meetings:

Paris, 12-13 May 2016

Azores, 3-8 July 2017

Osaka, 4-8 September 2017

## NRHEP Network Meetings

Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:

First Meeting:

9-13 July 2012, Aveiro, Portugal

Second Meeting:

11-14 March 2013, Lisbon, Portugal

Third Meeting:

6-10 January 2014, Mississippi, USA

Fourth Meeting:

7-10 July 2015, Rome, Italy

Fifth Meeting:

28 Sep-2 Oct 2015, Belém, Brazil

## Ph.D. and Post-doctoral opportunities

Contact us If you are interested in pursuing graduate studies/research in our group.

## Meetings 2016

A list of scientific meetings, mostly in gravitational physics, in 2016.