March 31th, 2017:

Our PRACE proposal has been awarded with 30,0 million core hours on Marconi KNL (CINECA, Italy) (PI: Roberto De Pietri) to simulate binary neutron star mergers and the associated gravitational wave signal!!!!

March 3th, 2017:

Francesco Maione got his PhD Title with the maximum mark and four published papers. Title: Gravitational-wave signal from binary neutron star merger simulations with different EOS and mass ratio. Congratulations!!!

December 29th, 2016:

On the CQG focus issue Rattle and shine: the signals from compact binary mergers (2017) we simulate the fate of the BNS systems in our Galaxy. See here for an artistic view picture of the location of the six galactic systems in our Milky way and here together with the simulated GW signal computed by our group.

September 29th, 2016: European Researchers' Night 2016

Within the University of Parma program we contributed with the open public presentation (in Italian): "Il suono dell'Universo: l'Onda del Secolo".. Details of the recently "heard" sound of two colliding Black Holes by the LIGO/VIRGO collaboration were discussed. We also enlightened the fate of the six galactic Binary Neutron Star systems and the associated "sound" during their merger as simulated by our group.

September 26th, 2016: Caffè Scientifico

Within the European Researchers' Night 2016whas also seen the restart of the "Caffè scientifici" of the Parma univeristy and we contributed with the event at the Libreria "La Feltrinelli", via Farini 17 titled: (in Italian): "Cosa ci dice la fisica sulla natura dello spazio e del tempo"..

August 10nd, 2016: new work by our group

Now on the CQG focus issue Rattle and shine: the signals from compact binary mergers: "Modeling Mergers of Known Galactic Systems of Binary Neutron Star". Published in Class.Quant.Grav. 34 (2017) no.3, 034001. arXiv:1608.02810. Movies of the simulations are HERE

June 16nd, 2016: Second gravitational waves detection announced

The LIGO/Virgo collaboration announced two more GW events: GW151226 was detected in the late evening of the Christmas day coming again from the merger of two black holes! Additionaly the third possible event LVT151012 was single out.

May 11nd, 2016: New work by our group is out

"Binary neutron star merger simulations with different initial orbital frequency and equation of state". arXiv:1605.03424. Classical and Quantum Gravity, 33, no. 17, 175009 (2016) Movies of the simulations are HERE.

February 29th, 2016: CINECA writes about our works

The CINECA press release is about our research on binary neutron star merger performed using the GALILEO supercomputer! And now (April 20th) even in PRD Kaleidoscope!!

February 11th, 2016 at 16:30 CET: VIRGO/LIGO Press Release

On February 11th, 2016 at 16:30 p.m. a Press relase for a status report on the effort to detect gravitational waves from the VIRGO-LIGO scientific collaborations was helded. We followed the live streaming in the Newton room of the physical department Poster. And now the news: The gravitational waves were detected on September 14, 2015 at 5:51 a.m. Eastern Daylight Time (09:51 UTC) by both of the twin Laser Interferometer Gravitational-wave Observatory (LIGO) detectors, located in Livingston, Louisiana, and Hanford, Washington, USA. The signal was named GW150914 The new era of gravitational wave astronomy has just begun!


Group Activity


The Gravitational Physics group at Parma University study the gravitational phenomena that are described by Einstein's general relativity (GR) theory. This theory is our best description of all the gravitational phenomena present in the universe. From one side it reduces to the standard Newton's theory for gravity when the velocity of motion of the bodies are much less than the speed of light and when gravitational fields are weak, but it also describe its tiny deviation measured in the solar system. But most striking it predicts Gravitational Waves, i.e., the existence of ripples of the space-time traveling at the speed of light.

More precisely the group is involved in the numerical simulation of Einstein's Equation and with the modeling of compact objects, such as neutron stars and black holes, and the generation of the gravitational waves emited by compact objects when they merge and collide.

We are members of the SUMA Collaboration for High Performance Computations.

Computational Framework

Our research greatly benefit from various community software development targeting the numerical simulation of Einstein's equations. Among them: the Einstein Toolkit code, the CACTUS code, the CARPET code and the LORENE code. We do firmly believe in the importance of the use of OPEN software in research and that all the research results should be made public and freely available.

Our computational activity is done in collaboration with the INFN High Performance Computation (HPC) group (SUMA collaboration) and is performed on the ZEFIRO cluster dedicate to the computational activity of the theoretical group of the INFN and on the HPC system located at CINECA where we greatly benefit of the possibility to access the FERMI and GALILEO systems.


Outreach


The member of the group are involved on outreach activities and we actively partecipated to the annual "Notte dei Ricercatori" events. Since we are based in "ITALY" the material in this section is in Italian.

The latest presentation given at the "Notte dei Ricercatori" are:
2016: "Il suono dell'Universo: l'Onda del Secolo";
2015: "La visione dell'universo della relatità generale e le immagini dalla sua fine (inizio): Planck ed i primi 25 anni del telescopio spaziale Hubble.";
2014: "Il Suono dell'Universo: Le Onde Gravitazionali"

Here you can also find a two-hours lecture on gravitational waves given at the XXVI SEMINARIO NAZIONALE di FISICA NUCLEARE E SUBNUCLEARE "Francesco Romano" OTRANTO, Serra degli Alimini 1, 4 - 11 giugno 2014: [slide in italian]


Research: Evolution of Binary Neutron Star


Here there is an example of the evolution of two neutron stars that merge to form an HyperMassive Neutron Star that will eventually collapse to a Black Hole. The snap shot are from the publication: "Modeling Equal and Unequal Mass Binary Neutron Star Mergers Using Public Codes" (arXiv:1509.08804 to apper in PRD) by De Pietri, Feo, Maione and Loeffler. More information can be found here.








Here you can see the dynamics of the Gravitational Waves signal for the meger of two Neutron Stars in three different cases that differ for the mass of two Stars. Namely models: 14vs14 15vs15 16vs16

Movies of Binary Neutron Star Systems

These movies refer to the merger of a BNS system made up of two equal-mass Neutron Stars of mass: (SLy14vs14) 1.28 Solar Mass. (SLy15vs15) 1.36 Solar Mass that eventually collapse to a Black Hole in 7.36 ms. (SLy16vs16) 1.44 Solar Mass that promptly collapse to a Black Hole.


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