TY - JOUR
T1 - New orbitals probes of ultra-light dark matter
AU - Blas, Diego
PY - 2018/12/1
Y1 - 2018/12/1
N2 - I will discuss how to use precision data from orbital motion of binary pulsars to constrain models of ultra-light dark matter (masses in the range 10−21 eV to 10−18 eV).
AB - I will discuss how to use precision data from orbital motion of binary pulsars to constrain models of ultra-light dark matter (masses in the range 10−21 eV to 10−18 eV).
KW - Light dark matter, binary pulsars, 95.35.+d, 97.60.Gb, Dark matter, Pulsars
U2 - 10.1142/S0217751X18450185
DO - 10.1142/S0217751X18450185
M3 - Article
VL - 33
SP - 1845018
JO - International Journal of Modern Physics A
JF - International Journal of Modern Physics A
SN - 0217-751X
IS - 34
ER -
TY - JOUR
T1 - Scattering of scalar, electromagnetic, and gravitational waves from binary systems
AU - Annulli, Lorenzo
AU - Bernard, Laura
AU - Blas, Diego
AU - Cardoso, Vitor
N1 - 19 pages, 3 figures, to appear in PRD
PY - 2018/10/1
Y1 - 2018/10/1
N2 - The direct detection of gravitational waves crowns decades of efforts in the modeling of sources and of increasing detectors’ sensitivity. With future third-generation Earth-based detectors or space-based observatories, gravitational-wave astronomy will be at its full bloom. Previously brushed-aside questions on environmental or other systematic effects in the generation and propagation of gravitational waves are now begging for a systematic treatment. Here, we study how electromagnetic and gravitational radiation is scattered by a binary system. Scattering cross sections, resonances and the effect of an impinging wave on a gravitational-bound binary are worked out for the first time. The ratio between the scattered-wave amplitude and the incident wave can be of order 10−5 for known pulsars, bringing this into the realm of future gravitational-wave observatories. For currently realistic distribution of compact-object binaries, the interaction cross section is too small to be of relevance.
AB - The direct detection of gravitational waves crowns decades of efforts in the modeling of sources and of increasing detectors’ sensitivity. With future third-generation Earth-based detectors or space-based observatories, gravitational-wave astronomy will be at its full bloom. Previously brushed-aside questions on environmental or other systematic effects in the generation and propagation of gravitational waves are now begging for a systematic treatment. Here, we study how electromagnetic and gravitational radiation is scattered by a binary system. Scattering cross sections, resonances and the effect of an impinging wave on a gravitational-bound binary are worked out for the first time. The ratio between the scattered-wave amplitude and the incident wave can be of order 10−5 for known pulsars, bringing this into the realm of future gravitational-wave observatories. For currently realistic distribution of compact-object binaries, the interaction cross section is too small to be of relevance.
KW - General Relativity and Quantum Cosmology, High Energy Physics - Theory
U2 - 10.1103/PhysRevD.98.084001
DO - 10.1103/PhysRevD.98.084001
M3 - Article
VL - 98
SP - 084001
JO - Physical Review D (Particles, Fields, Gravitation and Cosmology)
JF - Physical Review D (Particles, Fields, Gravitation and Cosmology)
SN - 1550-7998
ER -
TY - JOUR
T1 - Renormalization of gauge theories in the background-field approach
AU - Barvinsky, Andrei O.
AU - Blas, Diego
AU - Herrero-Valea, Mario
AU - Sibiryakov, Sergey M.
AU - Steinwachs, Christian F.
PY - 2018/7/5
Y1 - 2018/7/5
N2 - Using the background-field method we demonstrate the Becchi-Rouet-Stora-Tyutin (BRST) structure of counterterms in a broad class of gauge theories. Put simply, we show that gauge invariance is preserved by renormalization in local gauge field theories whenever they admit a sensible background-field formulation and anomaly-free path integral measure. This class encompasses Yang-Mills theories (with possibly Abelian subgroups) and relativistic gravity, including both renormalizable and non-renormalizable (effective) theories. Our results also hold for non-relativistic models such as Yang-Mills theories with anisotropic scaling or Hořava gravity. They strengthen and generalize the existing results in the literature concerning the renormalization of gauge systems. Locality of the BRST construction is emphasized throughout the derivation. We illustrate our general approach with several explicit examples.
AB - Using the background-field method we demonstrate the Becchi-Rouet-Stora-Tyutin (BRST) structure of counterterms in a broad class of gauge theories. Put simply, we show that gauge invariance is preserved by renormalization in local gauge field theories whenever they admit a sensible background-field formulation and anomaly-free path integral measure. This class encompasses Yang-Mills theories (with possibly Abelian subgroups) and relativistic gravity, including both renormalizable and non-renormalizable (effective) theories. Our results also hold for non-relativistic models such as Yang-Mills theories with anisotropic scaling or Hořava gravity. They strengthen and generalize the existing results in the literature concerning the renormalization of gauge systems. Locality of the BRST construction is emphasized throughout the derivation. We illustrate our general approach with several explicit examples.
KW - BRST Quantization, Effective Field Theories, Gauge Symmetry, Models of Quantum Gravity, High Energy Physics - Theory, General Relativity and Quantum Cosmology
U2 - 10.1007/JHEP07(2018)035
DO - 10.1007/JHEP07(2018)035
M3 - Article
VL - 2018
SP - 35
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
ER -
TY - JOUR
T1 - Binary pulsars as probes of a Galactic dark matter disk
AU - Caputo, Andrea
AU - Zavala, Jesús
AU - Blas, Diego
PY - 2018/3/1
Y1 - 2018/3/1
KW - Dark disk, Binary pulsar, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology
U2 - 10.1016/j.dark.2017.10.005
DO - 10.1016/j.dark.2017.10.005
M3 - Article
VL - 19
SP - 1
EP - 11
JO - Physics of the Dark Universe
JF - Physics of the Dark Universe
SN - 2212-6864
ER -
TY - JOUR
T1 - Theoretical aspects of antimatter and gravity
AU - Blas, Diego
PY - 2018/3/1
Y1 - 2018/3/1
U2 - 10.1098/rsta.2017.0277
DO - 10.1098/rsta.2017.0277
M3 - Article
VL - 376
SP - 20170277
JO - Philosophical Transactions of the Royal Society of London Series A
JF - Philosophical Transactions of the Royal Society of London Series A
ER -