Nace en La Ñora en 1985. En 2008 obtiene la licenciatura de Física por la Universidad de Murcia. A continuación cursa el máster en la Universidad de Valencia obteniendo el título de máster en Física Teórica en el año 2009. Entre 2008 y 2013 desarrolló su proyecto de tesis doctoral en el departamento de Física de la Universidad de Murcia, bajo la dirección del Dr. Emilio Torrente-Luján, obteniendo el grado de doctor en 2013 por la Universidad de Murcia. Durante este periodo, gozó de una beca de Formación de Personal Universitario (FPU). Además, mientras desarrolló la tesis doctoral realizó estancias investigadoras en diversos centros: CERN (Suiza), University of Groningen (Paises Bajos), Queen Mary University of London (Reino Unido), University of Pohang - Seoul (Corea del Sur). Tras defender su tesis doctoral en 2013, obtuvo tanto una beca postdoctoral de 2 años en el Departamento de Física de la Universidad de Buenos Aires como una beca de la Fundación Séneca para realizar una estancia posdoctoral investigado acerca de los diferentes aspectos de teoría de cuerdas en la Universidad de Harvard con el Prof. Cumrun Vafa,aceptando esta última.
We want to use the obtained expertise in supergravity in an optimal way for further applications. Part of the research will consider the formulation of the standard model in this new framework. It should be investigated in how far supergravity offers good possibilities for phenomenology, which in view of the current working experiments of the Large Hadron Collider in CERN and the Planck space observatory can become an important subject.
Since the gravitational theory of Einstein is extended to higher energies, as is the case in supergravity and string theory, it becomes appropriate to consider other applications as black holes and cosmology. This takes place at a convenient time, as the new experiments on the cosmic microwave background (Planck satellite) give for the first time detailed information that can distinguish different theories of inflation.
This is a dreamed domain of application where supergravity is of immediate importance. In particular, we will propose aspects that could be tested at LHC. Large extra dimension effects might be seen in high-energy colliders like the LHC and then directly probe the physics of supergravity.
The ideas of Maldacena imply that supergravity is more than an approximation. He formulated the AdS/CFT duality, which connects conformal field theories with classical supergravity theories. This opens a possibility to obtain non-perturbative results for field theories by translating the classical results from supergravity.
The history of field theory in the previous years has shown that a strategy of research to the fundaments and possibilities of supergravity pays off. The exact application domain has not always been clear from the start, but the theories have always been important in subsequent big steps for developing M-theories for unification or cosmology.
Física ,Espacio, Ciencias de la tierra ,Tecnología de los materiales
Harvard University
Research collaborators:
- Oscar Bedoya (MIT - IAFE Conicet)
- Eric Bergshoeff (Groningen University)
- David Berman (Queen Mary University)
- Giuseppe Dibitetto (Uppsala University)
- Gaston Giribet (Universidad Buenos Aires)
- Andrés Goya (Universidad Buenos Aires)
- Adolfo Guarino (NIKHEF)
- Olaf Hohm (MIT)
- Diego Marques (MIT - IAFE Conicet)
- Tomas Ortin (IFT Madrid)
- Jeong-Hyuck Park (Sogang University)
- Maria J. Rodriguez (Harvard University)
- Osvaldo Santillán ( Universidad Buenos Aires)
- Piotr Surowka (Harvard University)
- Emilio Torrente (Universidad Murcia)
- Oscar Varela (Harvard University)
- Cumrun Vafa (Harvard University)
- Barton Zwiebach (MIT)
08/09/2014 - 07/09/2016
1) Duality orbits of non-geometric fluxes
By G. Dibitetto, J.J. Fernandez-Melgarejo, D. Marques, D. Roest.
arXiv:1203.6562 [hep-th].
10.1002/prop.201200078.
Fortsch.Phys. 60 (2012) 1123-1149.
2) On 'New Massive' 4D Gravity
By Eric A. Bergshoeff, J.J. Fernandez-Melgarejo, Jan Rosseel, Paul K. Townsend.
arXiv:1202.1501 [hep-th].
10.1007/JHEP04(2012)070.
JHEP 1204 (2012) 070.
3) Non-minimal kinetic coupling and Chaplygin gas cosmology
By L.N. Granda, E. Torrente-Lujan, J.J. Fernandez-Melgarejo.
arXiv:1106.5482 [hep-th].
10.1140/epjc/s10052-011-1704-4.
Eur.Phys.J. C71 (2011) 1704.
4) The general gaugings of maximal d=9 supergravity
By J.J. Fernandez-Melgarejo, T. Ortin, E. Torrente-Lujan.
arXiv:1106.1760 [hep-th].
10.1007/JHEP10(2011)068.
JHEP 1110 (2011) 068.
Not yet.
2014 Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina. 01/05 to 31/08 2014 Sogang University, Seoul, South Korea. 01/02 to 01/03 2013 CERN - Theory Division, Geneve, Switzerland, 01/11 to 31/12. 2013 POSTECH - Pohang University of Science and Technology, Pohang, South Korea, 21/10 to 28/10. 2013 EMBL - European Molecular Biology Laboratory, Hamburg, Germany, 30/09 to 06/10. 2013 University of Cologne, Cologne, Germany, 21/09 to 27/09. 2012 Queen Mary University of London, Centre for Research in String Theory, London, United Kingdom, 20/11/2012 to 19/03/2013. 2011 Theoretical High-Energy Physics Department, University of Groningen, Groningen, The Netherlands, 01/10 to 31/01. 2011 CERN - Theory Division, Geneve, Switzerland, 15/08 to 31/08 2010 IFT - Universidad Autónoma de Madrid, Madrid, Spain, 21/11 to 21/12. 2010 CERN - Theory Division, Geneve, Switzerland, 02/08 to 29/08. 2009 SLAC National Accelerator Laboratory, Menlo Park, CA, USA, 03/08 to 14/08.
My research is the study of unifying theories that could describe the four fundamental interactions of the Universe: gravity, electromagnetism, weak interaction and strong interaction.
The main core of my research is supergravity. Supergravity was the first quantum field theory that was proposed as a unifying theory. Due to symmetries of this theory, local supersymmetry, this formulation could host the properties of the 4 fundamental forces in Nature. However, some renormalisability problems discarded the theory from the phenomological viewpoint. Recently, some results (Dickson et al, 2009) strongly point towards the UV finiteness of N=4 D=8 supergravity.
The appearance of string theory supposed an important leap in the understanding and the role of supergravity as a unifying theory. String theory is a theoretical framework in which the point-like particles are replaced by one-dimensional objects called strings. String theory aims to explain all types of observed elementary particles using quantum states of these strings. It incorporates gravity and so is a candidate for a theory of everything.
There exist various string theories. Then, particular 10-dimensional supergravity theories are considered "low energy limits" of the 10-dimensional superstring theories; namely, they describe a sector of the superstring states.
On the other hand, in 1978, a work of Werner Nahm showed that the maximum spacetime dimension in which one can formulate a consistent supersymmetric theory is eleven. In the same year, Eugene Cremmer, Bernard Julia, and Joel Scherk constructed a 11-dimensional supergravity which is, in fact, most elegant in this maximal number of dimensions.
And here there appears the concept of M-theory and its relation to supergravity. M-theory is a theory in Physics that unifies all consistent versions of superstring theory. The complete formulation of this theory is not known. However, due to some properties (dualities) among the superstring theories, the conjectured 11-dimensional theory should describe 11D supergravity as a "low energy limit". In addition, it should also describe two- and five-dimensional objects called branes, which are indeed solutions of the D=11 supergravity.
The way we study these unifying theories is by means of symmetries. A symmetry is a physical or mathematical feature of the theory that is preserved or remains unchanged under some transformation. In the same way the structure (symmetry) of the periodic table predicted the existence of some chemical elements, the symmetries of the theories that the describe the fundamental forces predicted the existence of some particle.
There are many aspects of unifying theories to be studied. My research fields are:
A usual day could be:
http://inspirehep.net/search?p=exactauthor%3AJ.J.Fernandez.Melgarejo.1&sf=earliestdate
From the scientific perspective, this is a very motivating and attractive place to work. It is a chance for:
- Knowing what are the working methods of top scientists.
- Discussing and exchanging ideas with leaders of some Theoretical Physics fields.
- Being up-to-date of the trending and hottest topics in the field.
- Attending seminars on these and other interesting fields.
- Meeting new people who could become collaborators in a near future.
The High Energy Theory Group at Harvard University is one of the most prestigious Theoretical Physics groups in the world. The reasons why this group is interesting for doing a postdoctoral stay are the following:
- Faculty members are top-cited physicist in the world, which is related to the quality of the research they develop
- The number of postdoctoral researchers and PhD students facilitates interaction and collaborations.
- The visitors policy is very active. It allows to discuss and attend seminars of the most prestigious researchers in the world.
- The center is located in a very strategic area for research. Other research centers as MIT, Boston University, Brandeis University, Tufts University make interaction with other members of the scientific community easier. In addition, Princeton University, Stony Brook, NYU and other research centers, despite of being further, are relatively well connected to Cambridge.
- These last two items imply the possibility of attending many interesting lectures, seminars, colloquiums and talks.
Harvard University
Georgi, Howard
Jafferis, Daniel
Randall, Lisa
Reece, Matthew
Schwartz, Matthew
Strominger, Andy
Vafa, Cumrun
Yin, Xi
There are the seminars and lectures which take place in the group weekly:
- String duality seminar
- Particle Physics seminar
- Particle Physics family lunchtime seminar
- String family lunchtime seminar
- HETG Journal club
Cambridge is a city in the Commonwealth of Massachusetts, USA, and part of the Greater Boston metropolis. It is the fifth largest city in the state. It is well-known as the location of both Harvard University and the Massachusetts Institute of Technology.
First settled in 1630 by English Puritans, Cambridge developed as an agricultural town and was not really convenient to Boston until bridges were built over the Charles River in 1793 and 1809. The latter of these opened up East Cambridge for industrial development led by furniture and glass factories. A major influx of penniless Irish immigrants fleeing the potato blight in 1845 increased the Irish population to 22 per cent in the next ten years. Toward the end of that century they were followed by immigrants from Italy, Poland, Portugal, and Germany. French Canadians and Russian Jews also came at this time. A small African American population had been growing from colonial times, attracted by the integrated schools.
The result today is a highly diverse population augmented and further diversified by brilliant men and women drawn to Cambridge over the years by Harvard, Radcliffe, M.I.T., and more recently by the local high technology companies. "Cantabrigians" (from the city's Latin name, Cantabrigia) are regarded as progressive and tolerant. As industrial activity moved south in the early 1900s, the Cambridge steamed forward on the power of its educators and innovators. Universities are the major employers, but cutting edge companies in information technology and biotechnology such as Akamai Technologies, Google, Microsoft, Genzyme, Biogen Idec, and Novartis are located adjacent to the MIT campus in the Kendall Square area.
The liberal city sometimes referred to as the "People's Republic of Cambridge" now advertises itself as "a city where counter-culture still lives, classic culture thrives, and multicultural is a way of life." "Boston's Left Bank: A little funkier, a little spunkier and definitely spicier than Boston."
African American Heritage Trail, [21]. Twenty historic plaques across the city honor notable African Americans who were abolitionists, authors, educators, and office holders in Cambridge from 1840 to 1940.
Mount Auburn Cemetery, [22]. Yes, it's a cemetery. It just happens to be the first landscaped cemetery and in fact the first large-scale designed landscape in the U.S. The tower provides visitors with a breathtaking panoramic view of the cities of Boston and Cambridge, as well as the surrounding countryside to the north. The fact that it's the final resting place of some of the area's most influential figures (Sumner, Gardner, Eddy, and Longfellow) cements its status as a National Historic Landmark.
Boston has a continental climate with some maritime influence, and using the −3 °C (27 °F) coldest month (January) isotherm, the city lies within the transition zone from a humid subtropical climate (Köppen Cfa) to a humid continental climate (Köppen Dfa),[82][83] although the suburbs north and west of the city are significantly colder in winter and solidly fall under the latter categorisation; the city lies at the transition between USDA plant hardiness zones 6b (most of the city) and 7a (Downtown, South Boston, and East Boston neighborhoods).[84] Summers are typically warm to hot, rainy, and humid, while winters oscillate between periods of cold rain and snow, with cold temperatures. Spring and fall are usually mild, with varying conditions dependent on wind direction and jet stream positioning. Prevailing wind patterns that blow offshore minimize the influence of the Atlantic Ocean.[85]
The hottest month is July, with a mean temperature of 73.4 °F (23.0 °C). The coldest month is January, with a mean of 29.0 °F (−1.7 °C). Periods exceeding 90 °F (32 °C) in summer and below freezing in winter are not uncommon but rarely extended, with about 13 and 25 days per year seeing each, respectively,[86] and the most recent sub-0 °F (−18 °C) reading occurring on January 24, 2011; several decades may pass between 100 °F (38 °C) readings, with the most recent such occurrence July 22, 2011.[86] The city's average window for freezing temperatures is November 9 through April 5.[86][b] Official temperature records have ranged from −18 °F (−28 °C) on February 9, 1934, up to 104 °F (40 °C) on July 4, 1911; the record cold daily maximum is 2 °F (−17 °C) on December 30, 1917, while, conversely, the record warm daily minimum is 83 °F (28 °C) on August 2, 1975.[87]
Boston's coastal location on the North Atlantic moderates its temperature, but makes the city very prone to Nor'easter weather systems that can produce much snow and rain.[88] The city averages 43.8 inches (1,110 mm) of precipitation a year, with 43.8 inches (111 cm) of snowfall per season.[86] Snowfall increases dramatically as one goes inland away from the city (especially north and west of the city)—away from the moderating influence of the ocean.[89] Most snowfall occurs from December through March, as most years see no measurable snow in April and November, and snow is rare in May and October.[90][91] There is also high year-to-year variability in snowfall; for instance, the winter of 2011−12 saw only 9.3 in (23.6 cm) of accumulating snow, but the previous winter, the corresponding figure was 81.0 in (2.06 m).[86][c]
Fog is fairly common, particularly in spring and early summer, and the occasional tropical storm or hurricane can threaten the region, especially in late summer and early autumn. Due to its situation along the North Atlantic, the city is often subjected to sea breezes, especially in the late spring, when water temperatures are still quite cold and temperatures at the coast can be more than 20 °F (11 °C) colder than a few miles inland, sometimes dropping by that amount near midday.[92][93] Thunderstorms occur from May to September, that are occasionally severe with large hail, damaging winds and heavy downpours.[88] Although downtown Boston has never been struck by a violent tornado, the city itself has experienced many tornado warnings. Damaging storms are more common to areas north, west, and northwest of the city.
VISA. The Harvard International Office provided me all the information for getting the corresponding VISA.
ACCOMMODATION. Webpages like craiglist.com and sabbaticalhomes.com are very useful for long-term stays.
The city offers some different activities. For more information, please check http://www.bostoncentral.com/
http://hetg.physics.harvard.edu/
There was no previous relation to the members of this group.
The usual way to apply for a grant in the field of Theoretical Physics (which also applies in this case) is just to contact by e-mail to the researcher or Principal Investigator (PI) and send him some academic information:
- CV
- Statement of research
- List of publications
- List of collaborators (in general, well-known researchers) for reference letters
Then, in case of interest, the PI would contact the collaborators for reference letters (these are completely confidential) to obtain a trusted and professional opinion of the applicant's skills. Then, the PI makes a decision which communicates to the applicant.
The Department of Physics at Harvard is large and diverse. With 10 Nobel Prize winners to its credit, the distinguished faculty of today engages in teaching and research that spans the discipline and defines its borders, and as a result Harvard is consistently one of the top-ranked physics departments in the world.
Research in the Department seeks to explore and explain fundamental questions that range from understanding the origin of the universe, including string theory, cosmology, and astrophysics, to understanding the visible world of colloids and theworld on an ever diminishing scale, from the mesoscale to the nanoscale, condensed matter, atomic and molecular and particle physics.
With more than 50 affiliated faculty members and 200 graduate students and 250 undergraduates the Physics Department has a lively intellectual environment, and emphasis is placed on teaching and preparing undergraduates to be at the forefront of the next generation of physicists.
We try to obtain a classification of the possible theories that one can construct for unifying the four fundamental forces. In addition we want to establish a hierarchy by formulating theories that are general enough (and satisfy some physical conditions) to host all the possible theories which are known up to now.
The way to do that requires some knowledge on Mathematics and Physics. Mathematical fields like geometry, algebra, group theory, tensorial calculus, differential equations, integrations... provide the tools for carrying out these goals. In general, we do not need statistics nor data analysis. So this means the calculations we address are purely theoretical. For doing these calculations we have two options.
- By hand. Some calculations are so specific (tensorial calculus, group theory, geometry, ...) that this is the only way to face them.
- By using computer software for symbolic calculations. Programs as Mathematica, Maple, Maxima, Cadabra,... can simplify the calculations we deal with.
Once some results are obtained, we analyse them and try to obtain and infer all the consequences they imply.
Whatever my opinion is, it will not be relevant for the development of my research. For questions, see below
