I am a theoretical physicist working at the
University of Surrey. Surf the upper panel
to find information about who I am and the
research I carry on. Students or post-docs interested in carrying out a research
project on theoretical nuclear and astronuclear physics and
looking for funding opportunities, please
Zombie degenerate stars!
I will give a talk on the IoP South Central Branch
about neutron stars... Which can in may ways be
zombie, degenerate stars! Come along to find out
why or have a look at the slides
Surrey nuclide charts
My nuclear experimental colleagues are world leaders
in their field. They customarily investigate
unexplained nuclear phenomena in experimental
facilities across the world. More importantly, they
work at the discovery frontier and have in fact
discover a number (>150) isotopes on their own
experiments. Click on the figure on your left to get
a full nuclide chart where Surrey-discovered
isotopes are highlighted in yellow! Impressive,
The figure has been created with
gnuplot, using the nuclear data in
Nubase2016 and the historical data provided by
Discovery of the Nuclides project.
Yuri Oganessian visits Surrey
Surrey will host the visit of an illustrious
Oganessian. He is directly or indirectly
responsible for the discovery of several new
elements - mostly those in the island of stability
of superheavy elements with more than 100 protons.
This has been recognised by the IUPAC,
that named element 118 Oganesson, Og, in his
Professor Oganessian will deliver a talk at 4:30 pm
in 01AC01. I am certainly attending - will you?
Matthew Barton becomes a doctor
Matthew Barton has successfully held his PhD thesis
viva today. His work on time-dependent Hartree-Fock
techniques has been published in a paper here
and a preprint here.
His thesis dealt with a more complex beyond-mean-field theory, time-dependent density
matrix, and was a feat in terms of both physics
output and computational developments.
Crust-core transition and Gogny forces
Neutron stars are like chocolat fondants:
solid in the outside and liquid in the inside.
The neutron liquid sea turns into a solid crystaline
lattice of nuclei at the so-called crust-core
transition point. The density at which this
transition occurs is correlated to
experimental properties of nuclei. In this paper
with the nuclear physics group in
Barcelona, we explore the range of crust-core
transitions predicted by Gogny nuclear
interactions and look an neutron-star properties as
well (like the mass-radius relation in the picture
on the left). More details
Nuclear spectral functions and chiral forces
Spectral functions characterise the properties of
nucleons in dense matter. They provide a
unique insight into nuclear correlations and can be
used to access both thermodynamical and structural properties. We have
found a way to characterise spectral functions and
provide a link to chiral nuclear hamiltonians by looking
at the size and shape of the spectral function's
standard deviations. All explained in more detail in
Here's the talk that I gave at the
Event "Redifining the Ordinary" on 27
February 2016. I hope you enjoy it!
Outreach on neutron star binaries
On Tuesday November 21 from 6:30 pm, I will be
participating in an outreach event on the
Gravitational Wave discovery GW170817 as announced
LIGO's latest gravitational wave detection has
spawned an explosion of new science across the global astronomical community.
I plan to focus on how this tells us
about neutron stars and the creation of the
elements. My colleague Rob Izzard from the
astrophysics group will discuss how these events
come into being in binary stellar systems.
Farewell to NewCompStar
Today I bid farewell to the
action. It has been a very interesting 4 years, with
several meetings, conferences, workshops and summer
schools. To me, the real value of this action has
been the interdisciplinary components:meeting with
colleagues of the astrohysics community
to discuss and progress our understanding on neutron
stars. The farewell coincides with the discovery of
the binary GW170817 in gravitational waves and
across the electromagnetic spectrum, which opens a new
window into neutron stars... I have tried to
summarise the progress on equation of state in the
NewCompStar era in the review talk
here in a
nice meeting in Catania.
Di-neutrons? Yes, please
Di-neutrons are loosely bound states of two
neutrons. They do not exist in free-space, but they
can appear in dense nuclear media. In a
collaboration with Felipe Isaule (who visited Surrey
for a month on Jan 2015) and Prof.
Hugo Arellano, we
report on the first microscopic results on the
structure of di-neutrons in neutron matter.
Fission paper out
My second paper on nuclear fission,
with results from Phil Goddard's thesis and in
collaboration with Paul Stevenson,
has now been published here. Have a look to see what you can do with
3D TDHF and boosts!
Rosh Sellahewa becomes a doctor
(co-supervised with Jim Al-Khalili) has
successfully held his thesis viva today. His work on
neutron star physics and the Gogny interaction has
been published here. And there are
more papers to come, even though Rosh has moved on
to pastures new. Congratulations Rosh!
This website has been on a standstill during my
paternity leave on the summer of 2015 - but I am
back to work!
I have decided to dub this week "Fission week":
my first paper on fission has been accepted for
publication in Phys. Rev. C, and the second one is
out now as a preprint. All
these results were cooked up by Phil Goddard, a
former PhD student that now does more useful stuff!
Pairing gap and correlations
The pairing gap in high-density neutron matter is
sensite to short- and long-range
correlations. Some new results on these effects are
presented in a preprint, written with collaborators at
Washington University in St. Louis.
Phil Goddard becomes a doctor
Arnau's second PhD student, Phil Goddard,
(co-supervised with Paul Stevenson) has
successfully held his thesis viva today. Congratulations Phil!
Gogny forces and neutron stars
The first paper from Rosh Sellahewa's PhD is now
out. Check it out if you are interested on Gogny
forces or neutron stars! It's here.
Propagating errors at finite T
Arnau's first paper with Xavier
Roca-Maza looks at error propagation in "hot" density
functional theory. Have a look at it here.
Arianna Carbone becomes a doctor
Arnau's first PhD student, Arianna Carbone,
(co-supervised with Artur Polls) has
successfully defended her thesis. Feel free to have a look at it here.
Creative Commons Paper
Arnau first open access (CC licence)
paper has been published today.
Post @ Surrey Physics Blog
Arnau has written a post on the 10th-year
anniversary of the Close Encounters of the PhD
King. Check it out
High-momentum components in nuclear matter
Arnau has submitted a paper on the density and
isospin asymmetry dependence of short-range
correlations. It has implications for electron
scattering experiments. Check it
Arnau is organizing a
on "Advances in time-dependent methods for quantum
many-body systems" at the ECT* in Trento this coming
Registration is now open.
Thanks everyone for attending the
on "ISNET: Information and Statistics in Nuclear
Experiment and Theory" at the University of Glasgow.
Talks are available here.
Thanks everyone for attending the
on "Neutron Stars" at the Institute of Advanced
Studies. It was a terrific meeting! Talks and photos
are available here.
Chiral three-nucleon forces
Arianna Carbone's PhD thesis is going
forward. Check this
for our latest results involving three-body forces
within the Green's functions approach.
Pygmy dipole resonance in Selenium
with nuclear experimentalists!
Why is lead so kinky?
If you ever wondered
why lead is so kinky, have a look at this
Arnau is organizing a
on "Correlations in exotic nuclear systems" at the
Cockroft Institute, Daresbury Laboratory. This will be a
meeting point for experimentalists and theorists
interested in the evolution of correlations with
isospin asymmetry, including everything from shell
changes to symmetry energy studies.
Contact me if you are interested in participating!
IoP SOUTH CENTRAL BRANCH LECTURE
Arnau gave an outreach IoP Lecture on
at the University of Surrey. Thanks to all of those
who attended it!
Link to the talk:
30 July 2012: Arnau's first
group has been submitted!
9 July 2012: Check out Arnau's outreach
on the Higg's boson
10 January 2012: Arnau's first
EPL has been published