Luis Gonzalez-Mestres - Academia.edu (original) (raw)
Uploads
Papers by Luis Gonzalez-Mestres
Proceedings of XXIst International Europhysics Conference on High Energy Physics — PoS(EPS-HEP2011), May 31, 2012
HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2013
The Planck collaboration reports an age of the Universe t close to 13.82 Gyr and a present ratio ... more The Planck collaboration reports an age of the Universe t close to 13.82 Gyr and a present ratio H between relative speeds and distances at cosmic scale around 67.8 km/s/Mpc. The product of these two measured quantities is then slightly below 1 (about 0.96), while it can be exactly 1 in the absence of matter and cosmological constant in suitable patterns. An example is the cosmology based on a spinorial space-time we have considered in previous papers, where such an expansion law is of purely geometric origin and can reflect an equilibrium between the dynamics of the ultimate constituents of matter and the geometry of space and time. Taking also into account the observed cosmic acceleration, the present situation suggests that the value of 1 can be a natural asymptotic limit for the product H t in the long-term evolution of our Universe up to possible small corrections. No ad hoc combination of dark matter and dark energy would then be needed to get an acceptable value of the cosmic speed/distance ratio H. We briefly comment on possible realistic versions of cosmologies exhibiting this property.
Il Nuovo Cimento C, Mar 1, 1986
We present a proposal to detect magnetic monopoles with a suspension of metastable superconductin... more We present a proposal to detect magnetic monopoles with a suspension of metastable superconducting granules. The method is independent of the speed of the monopole, and provides timing ~nd tracking information. The speed and direction of the monopole can be determined with good accuracy. The electronic signal exceeds by two orders of magnitude that of induction experiments, and conventional electronics can be used. As a consequence, large-area detectors can be built at a reasonable cost. The physical principle of detection uses a specific effect associated to the magnetic charge in the static limit. Therefore, the monopole signal cannot be faked by any charged particle. This provides very high background rejection. We discuss the present status of the project, as well as some of the main technical problems.
Il Nuovo Cimento C, Mar 1, 1986
New developments are proposed to optimize and widen the use of metastable superconducting detecto... more New developments are proposed to optimize and widen the use of metastable superconducting detectors in particle physics. Thin superheated wires are considered as possible detectors. It is suggested that supercooling can also be put to work for monopole detection.
Contents: 1. Introduction. 2. The neutrino. 3. Neutrino mass studies and double beta decay. 4. So... more Contents: 1. Introduction. 2. The neutrino. 3. Neutrino mass studies and double beta decay. 4. Solar neutrinos. 5. Other neutrinos. 6. Galactic dark matter. 7. Neutrinos as dark matter. 8. Axions. 9. Weakly interacting massive particles (WIMP). 10. The problem of WIMP detection. 11. Monopoles. 12. Low temperature detectors. 13. Conclusion.
Detecting ultra-high energy cosmic-ray events from space offers a unique opportunity to test Lore... more Detecting ultra-high energy cosmic-ray events from space offers a unique opportunity to test Lorentz symmetry. Possible violations of special relativity at the Planck scale must be explored by examining as closely as possible the structure and time evolution of the first interactions of the event, where Planck-scale physics can directly manifest itself through the lifetimes, decays and interaction properties of the particles involved. In this energy region, quadratically deformed relativistic kinematics (QDRK) appears as a particularly appealing phenomenological model. Possible signatures of superluminal particles with positive mass and energy (superbradyons) are also discussed.
XXIV International Conference on High Energy Physics, 1989
The present status of cryogenic detector developments for particle physics is discussed, with emp... more The present status of cryogenic detector developments for particle physics is discussed, with emphasis on applications at the cross-disciplinary frontier between particle physics and astrophysics, where low temperature devices appear to be particularly well suited. The critical overview of to-date results is completed by a sketch of new ideas and possible ways for further improvements.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1989
... possibility will be discussed later on. 3. What is known on indium crystal compounds? The fir... more ... possibility will be discussed later on. 3. What is known on indium crystal compounds? The first transparent InBO3 single crystals were grown five years ago [18] at the Sakura-mura Electro-X. NOVEL DETECTORS AND TECHNIQUES 384 L. Gonzalez-Mestres, D. Perret-Gallix ...
AIP Conference Proceedings, 2001
In previous papers (e.g. physics/0003080 and references therein), it was pointed out that Lorentz... more In previous papers (e.g. physics/0003080 and references therein), it was pointed out that Lorentz symmetry violation (LSV) at Planck scale can play a crucial role in astrophysical processes at very high energy. It can potentially inhibit radiation under external forces (e.g. synchrotron-like), GZK-like cutoffs, decays, photodisintegration of nuclei, momentum loss trough collisions (e.g. with a photon wind in reverse shocks), production of lower-energy secondaries... An updated description of this phenomenon is presented, focusing on acceleration in relativistic shocks and having in mind a model where the effective parameter driving LSV would vary like the square of the momentum scale (Quadratically Deformed Relativistic Kinematics, QDRK). Implications for ultra-high energy (UHE) neutrino production are equally discussed.
Lettere al Nuovo Cimento, 1970
Il Nuovo Cimento C, 1986
ABSTRACT
Nucleosynthesis and Its Implications on Nuclear and Particle Physics, 1986
ABSTRACT
Il Nuovo Cimento C, 1986
ABSTRACT
Lettere Al Nuovo Cimento Series 2, 1975
Proceedings of XXIst International Europhysics Conference on High Energy Physics — PoS(EPS-HEP2011), May 31, 2012
HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2013
The Planck collaboration reports an age of the Universe t close to 13.82 Gyr and a present ratio ... more The Planck collaboration reports an age of the Universe t close to 13.82 Gyr and a present ratio H between relative speeds and distances at cosmic scale around 67.8 km/s/Mpc. The product of these two measured quantities is then slightly below 1 (about 0.96), while it can be exactly 1 in the absence of matter and cosmological constant in suitable patterns. An example is the cosmology based on a spinorial space-time we have considered in previous papers, where such an expansion law is of purely geometric origin and can reflect an equilibrium between the dynamics of the ultimate constituents of matter and the geometry of space and time. Taking also into account the observed cosmic acceleration, the present situation suggests that the value of 1 can be a natural asymptotic limit for the product H t in the long-term evolution of our Universe up to possible small corrections. No ad hoc combination of dark matter and dark energy would then be needed to get an acceptable value of the cosmic speed/distance ratio H. We briefly comment on possible realistic versions of cosmologies exhibiting this property.
Il Nuovo Cimento C, Mar 1, 1986
We present a proposal to detect magnetic monopoles with a suspension of metastable superconductin... more We present a proposal to detect magnetic monopoles with a suspension of metastable superconducting granules. The method is independent of the speed of the monopole, and provides timing ~nd tracking information. The speed and direction of the monopole can be determined with good accuracy. The electronic signal exceeds by two orders of magnitude that of induction experiments, and conventional electronics can be used. As a consequence, large-area detectors can be built at a reasonable cost. The physical principle of detection uses a specific effect associated to the magnetic charge in the static limit. Therefore, the monopole signal cannot be faked by any charged particle. This provides very high background rejection. We discuss the present status of the project, as well as some of the main technical problems.
Il Nuovo Cimento C, Mar 1, 1986
New developments are proposed to optimize and widen the use of metastable superconducting detecto... more New developments are proposed to optimize and widen the use of metastable superconducting detectors in particle physics. Thin superheated wires are considered as possible detectors. It is suggested that supercooling can also be put to work for monopole detection.
Contents: 1. Introduction. 2. The neutrino. 3. Neutrino mass studies and double beta decay. 4. So... more Contents: 1. Introduction. 2. The neutrino. 3. Neutrino mass studies and double beta decay. 4. Solar neutrinos. 5. Other neutrinos. 6. Galactic dark matter. 7. Neutrinos as dark matter. 8. Axions. 9. Weakly interacting massive particles (WIMP). 10. The problem of WIMP detection. 11. Monopoles. 12. Low temperature detectors. 13. Conclusion.
Detecting ultra-high energy cosmic-ray events from space offers a unique opportunity to test Lore... more Detecting ultra-high energy cosmic-ray events from space offers a unique opportunity to test Lorentz symmetry. Possible violations of special relativity at the Planck scale must be explored by examining as closely as possible the structure and time evolution of the first interactions of the event, where Planck-scale physics can directly manifest itself through the lifetimes, decays and interaction properties of the particles involved. In this energy region, quadratically deformed relativistic kinematics (QDRK) appears as a particularly appealing phenomenological model. Possible signatures of superluminal particles with positive mass and energy (superbradyons) are also discussed.
XXIV International Conference on High Energy Physics, 1989
The present status of cryogenic detector developments for particle physics is discussed, with emp... more The present status of cryogenic detector developments for particle physics is discussed, with emphasis on applications at the cross-disciplinary frontier between particle physics and astrophysics, where low temperature devices appear to be particularly well suited. The critical overview of to-date results is completed by a sketch of new ideas and possible ways for further improvements.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1989
... possibility will be discussed later on. 3. What is known on indium crystal compounds? The fir... more ... possibility will be discussed later on. 3. What is known on indium crystal compounds? The first transparent InBO3 single crystals were grown five years ago [18] at the Sakura-mura Electro-X. NOVEL DETECTORS AND TECHNIQUES 384 L. Gonzalez-Mestres, D. Perret-Gallix ...
AIP Conference Proceedings, 2001
In previous papers (e.g. physics/0003080 and references therein), it was pointed out that Lorentz... more In previous papers (e.g. physics/0003080 and references therein), it was pointed out that Lorentz symmetry violation (LSV) at Planck scale can play a crucial role in astrophysical processes at very high energy. It can potentially inhibit radiation under external forces (e.g. synchrotron-like), GZK-like cutoffs, decays, photodisintegration of nuclei, momentum loss trough collisions (e.g. with a photon wind in reverse shocks), production of lower-energy secondaries... An updated description of this phenomenon is presented, focusing on acceleration in relativistic shocks and having in mind a model where the effective parameter driving LSV would vary like the square of the momentum scale (Quadratically Deformed Relativistic Kinematics, QDRK). Implications for ultra-high energy (UHE) neutrino production are equally discussed.
Lettere al Nuovo Cimento, 1970
Il Nuovo Cimento C, 1986
ABSTRACT
Nucleosynthesis and Its Implications on Nuclear and Particle Physics, 1986
ABSTRACT
Il Nuovo Cimento C, 1986
ABSTRACT
Lettere Al Nuovo Cimento Series 2, 1975