Probing the f(R) formalism through gravitational wave polarizations

The direct observation of gravitational waves (GWs) in the near future, and the corresponding determination of the number of independent polarizations, is a powerful tool to test general relativity and alternative theories of gravity. In the present work we use the Newman-Penrose formalism to characterize GWs in quadratic gravity and in a particular class of f(R) Lagrangians. We find that both quadratic gravity and the f(R) theory belong to the most general invariant class of GWs, i.e., they can present up to six independent polarizations of GWs. For a particular combination of the parameters, we find that quadratic gravity can present up to five polarizations states. On the other hand, if we use the Palatini approach for f(R) theories, GWs present only the usual two transverse-traceless polarizations such as in general relativity. Thus, we conclude that the observation of GWs can strongly constrain the suitable formalism for these theories.Comment: 18 pages, 1 figure, accepted for publication in Physics Letters

Status Report Of The Schenberg Gravitational Wave Antenna

Here we present a status report of the Schenberg antenna. In the past three years it has gone to a radical upgrading operation, in which we have been installing a 1K pot dilution refrigerator, cabling and amplifiers for nine transducer circuits, designing a new suspension and vibration isolation system for the microstrip antennas, and developing a full set of new transducers, microstrip antennas, and oscillators. We are also studying an innovative approach, which could transform Schenberg into a broadband gravitational wave detector.3631Aguiar, O.D., (2002) Class. Quantum Grav., 19, p. 1949Aguiar, O.D., (2004) Class. Quantum Grav., 21, pp. S457Aguiar, O.D., (2005) Class. Quantum Grav., 22, pp. S209Aguiar, O.D., (2006) Class. Quantum Grav., 23, pp. S239Aguiar, O.D., (2008) Class. Quantum Grav., 25, p. 114042Costa, C.A., (2008) Class. Quantum Grav., 25, p. 184002Johnson, W.W., Merkowitz, S.M., (1993) Phys. Rev. Lett., 70, p. 2367Coccia, E., Lobo, J.A., Ortega, J.A., (1995) Phys. Rev. D, 52, p. 3735Thorne, K.S., (1978) Phys. Rev. Lett., 40, p. 667Tobar, M.E., Ivanov, E.N., Blair, D.G., (2000) Gen. Rel. Grav., 32, p. 1799De Waard, (2005) Class. Quantum Grav., 22, pp. S215Vinet, J.-Y., (2010) Research in Astron Astrophys., 10, p. 956Costa, C.A., Aguiar, O.D., Magalhães, N.S., (2004) Class. Quantum Grav., 21, pp. S827Forward, R.L., (1971) Gen. Rel. Grav., 2, p. 149Eardley, D.M., Lee, D.L., Lightman, A.P., Wagoner, R.V., Will, C.M., (1973) Phys. Rev. Lett., 30, p. 884Bianchi, M., Coccia, E., Colacino, C.N., Fafone, V., Fucito, F., (1996) Class. Quantum Grav., 13, p. 2865Andrade, L.A., (2009) Microwave and Optical Tech. Lett., 51, p. 1120Furtado, S.R., (2012), in preparationIvanov, E.N., Hartnett, J.G., Tobar, M.E., (2000) IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 47, p. 1526Pimentel, G.L., (2008) J. Phys. Conf. Series, 122, p. 012028Aguiar, (2009) Int. J. Modern Phys. D, 18, p. 2317Furtado, S.R., (2009), Ph.D. Thesis at INPE, not publishedBraginsky, V.B., Vorontsov, Y.I., Thorne, K.S., (1980) Science, 209, p. 547Thorne, K.S., The Quantum Limit for Gravitational-Wave Detectors and Methods of Circumventing It (1979) Sources of Gravitational Waves, p. 49. , ed. L L Smarr, Cambridge University Press, Cambridge, US

The Status Of The Brazilian Spherical Detector

The first phase of the Brazilian Graviton Project is the construction and operation of the gravitational wave detector Mario Schenberg at the Physics Institute of the University of São Paulo. This gravitational wave spherical antenna is planned to feature a sensitivity better than h = 10 -21Hz-1/2 at the 3.0-3.4 kHz bandwidth, and to work not only as a detector, but also as a testbed for the development of new technologies. Here we present the status of this detector.19719491953Forward, R.L., (1971) Gen. Rel. Grav., 2, p. 149Wagoner, R.V., Paik, H.-J., (1977) Proc. Academia Nationale dei Lincei, Int. Symp. on Experimental Gravitation, (Pavia, Italy, Sept. 1976), p. 257Johnson, W.W., Merkowitz, S.M., (1993) Phys. Rev. Lett., 70, p. 2367Coccia, E., (1997) 14th Int. Conf. on General Relativity and Gravitational (Florence, 1995), p. 103. , Singapore: World ScientificWaard, A., Frossati, G., (2000) AIP Conf. Proc. Vol 523, 523, p. 268. , Proc. 3rd Edoardo Amaldi Conf. on Gravitational Waves (Pasadena, CA, 1999) (New York: American Institute of Physics)Frossati, G., (1997) Proc. 1st Int. Workshop of Omnidirectional Gravitational Radiation Observatory (São José dos Campos, Brazil, May 26-31, 1996), p. 179. , ed W F Velloso O D Aguiar and N S Magalhães (Singapore: World Scientific)(2000) AIP Conf. Proc. Vol 523, 523. , Proc. 3rd Edoardo Amaldi Conf. on Gravitational Waves (Pasadena, CA, 1999) (New York: American Institute of Physics) (2000)De Waard, A., Gottardi, L., Frossati, G., (2002) Class. Quantum Grav., 19, p. 1935Wagoner, R.V., (1984) Astrophys. J., 278, p. 345Schutz, B.F., (1997) Relativistic Astrophysics and Gravitational Radiation, , ed J-A Marck and J-P Lasota (Cambridge: Cambridge University Press)Anderson, N., Kokkotas, K.D., (1996) Phys. Rev. Lett., 77, p. 4134Anderson, N., Araújo, M.E., Schutz, B.F., (1993) Class. Quantum Grav., 10, p. 757Friedman, J.L., Ipser, J.R., Parker, L., (1989) Phys. Rev. Lett., 62, p. 3015Haensel, P., Lasota, J.P., Zdunik, J.L., 1999 Preprint astro-ph/9905036Nakamura, T., Sasaki, M., Tanaka, T., Thorne, K.S., (1997) Astrophys. J., 487, pp. L139Thorne, K.S., (1987) 300 Years of Gravitation, p. 330. , ed S Hawking and W Israel (Cambridge: Cambridge University Press)Harry, G.M., Stevenson, T.R., Paik, H.-J., (1996) Phys. Rev. D, 54, p. 2409De Araújo, J.C.N., Miranda, O.D., Aguiar, O.D., (2001) Astrophys. J., 550, p. 368Meliani, M.T., De Araújo, J.C.N., Aguiar, O.D., (2000) Astron. Astrophys., 358, p. 417De Araújo, J.C.N., Miranda, O.D., Aguiar, O.D., (2000) Phys. Rev. D, 61, p. 124015Novello, M., Lorenci, V.A., Freitas, L., Aguiar, O.D., (1999) Phys. Lett. A, 254, p. 245Mosquera Cuesta, H.J., De Araújo, J.C.N., Aguiar, O.D., Horvath, J.E., (1998) Phys. Rev. Lett., 80, p. 2988Velloso W.F., Jr., Melo, J.L., Aguiar, O.D., (2000) Rev. Sci. Instrum., 71, p. 2552Magalhães, N.S., Aguiar, O.D., Frajuca, C., Marinho R.M., Jr., (2001) Nucl. Instrum. Methods A, 457, p. 175Magalhães, N.S., Johnson, W.W., Frajuca, C., Aguiar, O.D., (1997) Astrophys. J., 475, p. 462Magalhães, N.S., Aguiar, O.D., Frajuca, C., (1997) Gen. Rel. Grav., 29, p. 1511Magalhães, N.S., Johnson, W.W., Frajuca, C., Aguiar, O.D., (1995) Mon. Not. R. Astron. Soc., 274, p. 67

The Gravitational Wave Detector "mario Schenberg": Status Of The Project

The first phase of the Brazilian Graviton Project is the construction and operation of the gravitational wave detector Mario Schenberg at the Physics Institute of the University of São Paulo. This gravitational wave spherical antenna is planned to feature a sensitivity better than h = 10-21 Hz-1/2 at the 3.0-3.4 kHz bandwidth, and to work not only as a detector, but also as a testbed for the development of new technologies. Here we present the status of this detector.324866868notenoteForward, R.L., (1971) General Relativity and Gravitation, 2, p. 149Wagoner, R.V., Paik, H.-J., (1976) Proceedings of the Academia Nazionale dei Lincei, International Symposium on Experimental Gravitation, p. 257. , Pavia, Italy, SeptJohnson, W.W., Merkowitz, S.M., (1993) Physical Review Letters, 70, p. 2367Coccia, E., (1995) 14th International Conference on General Relativity and Gravitational, p. 103. , Florence, World Scientific, SingaporeWaard, A., Frossati, G., Proceedings of the third Edoardo Amaldi conference on gravitational waves (1999) AIP Conference Proceedings, 523, p. 268. , Pasadena, California. American Institute of PhysicsFrossati, G., (1996) Proceeding of the First International Workshop of Omnidirectional Gravitational Radiation Observatory, p. 179. , São José dos Campos, Brazil, May 26-31, edited by W. F. Velloso, O. D. Aguiar, and N. S. Magalhães, World Scientific, Singapore(2001), www.minigrail.nlProceedings of the third Edoardo Amaldi conference on gravitational waves (1999) AIP Conference Proceedings, 523. , Pasadena, California. American Institute of PhysicsWagoner, R.V., (1984) Ap. J., 278, p. 345Schutz, B.F., (1997) Relativistic Astrophysics and Gravitational Radiation, , eds. J-A. Marck and J-P. Lasota, Cambridge Univ. PressAnderson, N., Kokkotas, K.D., (1996) Phys. Rev. Lett., 77, p. 4134Anderson, N., Araújo, M.E., Schutz, B.F., (1993) Class. Quantum Grav., 10, p. 757Friedman, J.L., Ipser, J.R., Parker, L., (1989) Phys. Rev. Lett., 62, p. 3015Haensel, P., Lasota, J.-P., Zdunik, J.L., 1999 preprint (astro-ph/9905036)Nakamura, T., Sasaki, M., Tanaka, T., Thorne, K.S., (1997) Ap. J., 487, pp. L139Thorne, K.S., (1987) 300 Years of Gravitation, p. 330. , edited by S. Hawking and W. Israel, Cambridge Univ. Press, CambridgeHarry, G.M., Stevenson, T.R., Paik, H.-J., (1996) Phys. Rev., D54, p. 2409De Araujo, J.C.N., Miranda, O.D., Aguiar, O.D., (2001) Ap. J., 550, p. 368Meliani, M.T., De Araujo, J.C.N., Aguiar, O.D., (2000) Astron. Astrophys., 358, p. 417De Araujo, J.C.N., Miranda, O.D., Aguiar, O.D., (2000) Phys. Rev., D61, p. 124015Novelle, M., Lorenci, V.A., Freitas, L., Aguiar, O.D., (1999) Phys. Lett., A 254, p. 245Mosquera-Cuesta, H.J., De Araujo, J.C.N., Aguiar, O.D., Horvath, J.E., (1998) Phys. Rev. Lett., 80, p. 2988Velloso W.F., Jr., Melo, J.L., Aguiar, O.D., (2000) Rev. Sci. Instrum., 71, p. 2552Magalhães, N.S., Aguiar, O.D., Frajuca, C., Marinho R.M., Jr., (2001) Nucl. Instrum. Meth. Phys. Res., A457, p. 175Magalhães, N.S., Aguiar, O.D., Frajuca, C., Marinho R.M., Jr., Chiang, J., (2001) Nucl. Instrum. Meth. Phys. Res., , in pressMarinho R.M., Jr., Magalhães, N.S., Aguiar, O.D., Frajuca, C., (2001) Phys. Rev. D, , in pressMagalhẽs, N.S., Johnson, W.W., Frajuca, C., Aguiar, O.D., (1997) Ap. J., 475, p. 462Magalhães, N.S., Aguiar, O.D., Frajuca, C., (2001) Phys. Rev. D, , in pressMagalhães, N.S., Aguiar, O.D., Frajuca, C., (1997) Gen. Rel. Grav., 29, p. 1511Magalhães, N.S., Johnson, W.W., Frajuca, C., Aguiar, O.D., (1995) Mon. Not. R. Astr. Soc, 274, p. 67

The gravitational wave detector Mario Schenberg: status of the project

The first phase of the Brazilian Graviton Project is the construction and operation of the gravitational wave detector Mario Schenberg at the Physics Institute of the University of São Paulo. This gravitational wave spherical antenna is planned to feature a sensitivity better than h = 10-21 Hz-1/2 at the 3.0-3.4 kHz bandwidth, and to work not only as a detector, but also as a testbed for the development of new technologies. Here we present the status of this detector.866868Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

The Schenberg Spherical Antenna: Status Report

We present a status report of the SCHENBERG antenna, which started commissioning runs in September 2006 under the full support of FAPESP. In the past year, however, it has undergone a radical upgrading operation, in which we have been installing a 1K pot dilution refrigerator, cabling and amplifiers for nine transducers circuits, and a new suspension and vibration isolation system for the cabling and microstrip antennas. We also have been developing a new set of transducers, microwave oscillators, microstrip antenna pairs, and studying an innovative approach, which could transform SCHENBERG into a broadband gravitational wave detector. Copyright © 2012 by World Scientific Publishing Co. Pte. Ltd.16491651United Nations Educational Scientific,and Cultural Organization (UNESCO),International Union of Pure and Applied Physics (IUPAP),National Science Foundation (NSF),Commissariat a l'Energie Atomique (CEA)Aguiar, O.D., (2002) Class. Quantum Grav., 19, p. 1949Aguiar, O.D., (2004) Class. Quantum Grav., 21, pp. S457Aguiar, O.D., (2005) Class. Quantum Grav., 22, pp. S209Aguiar, O.D., (2006) Class. Quantum Grav., 23, pp. S239Aguiar, O.D., (2008) Class. Quantum Grav., 25, p. 114042Aguiar, O.D., (2009) Int. J. Mod. Phys. D, 18, p. 231